Directive 2005/55/EC of the European Parliament and of the Council (repealed)Show full title

ANNEX III U.K. TEST PROCEDURE

1. INTRODUCTION U.K.

1.1. This Annex describes the methods of determining emissions of gaseous components, particulates and smoke from the engines to be tested. Three test cycles are described that shall be applied according to the provisions of Annex I, Section 6.2: U.K.

• the ESC which consists of a steady state 13-mode cycle,

• the ELR which consists of transient load steps at different speeds, which are integral parts of one test procedure, and are run concurrently,

• the ETC which consists of a second-by-second sequence of transient modes.

1.2. The test shall be carried out with the engine mounted on a test bench and connected to a dynamometer. U.K.

1.3. Measurement principle U.K.

The emissions to be measured from the exhaust of the engine include the gaseous components (carbon monoxide, total hydrocarbons for diesel engines on the ESC test only; non-methane hydrocarbons for diesel and gas engines on the ETC test only; methane for gas engines on the ETC test only and oxides of nitrogen), the particulates (diesel engines only) and smoke (diesel engines on the ELR test only). Additionally, carbon dioxide is often used as a tracer gas for determining the dilution ratio of partial and full flow dilution systems. Good engineering practice recommends the general measurement of carbon dioxide as an excellent tool for the detection of measurement problems during the test run.

1.3.1. ESC test U.K.

During a prescribed sequence of warmed-up engine operating conditions the amounts of the above exhaust emissions shall be examined continuously by taking a sample from the raw exhaust gas. The test cycle consists of a number of speed and power modes which cover the typical operating range of diesel engines. During each mode the concentration of each gaseous pollutant, exhaust flow and power output shall be determined, and the measured values weighted. The particulate sample shall be diluted with conditioned ambient air. One sample over the complete test procedure shall be taken, and collected on suitable filters. The grams of each pollutant emitted per kilowatt hour shall be calculated as described in Appendix 1 to this Annex. Additionally, NO_x shall be measured at three test points within the control area selected by the Technical Service(1) and the measured values compared to the values calculated from those modes of the test cycle enveloping the selected test points. The NO_x control check ensures the effectiveness of the emission control of the engine within the typical engine operating range.

1.3.2. ELR test U.K.

During a prescribed load response test, the smoke of a warmed-up engine shall be determined by means of an opacimeter. The test consists of loading the engine at constant speed from 10 % to 100 % load at three different engine speeds. Additionally, a fourth load step selected by the Technical Service(1) shall be run, and the value compared to the values of the previous load steps. The smoke peak shall be determined using an averaging algorithm, as described in Appendix 1 to this Annex.

1.3.3. ETC test U.K.

During a prescribed transient cycle of warmed-up engine operating conditions, which is based closely on road-type-specific driving patterns of heavy-duty engines installed in trucks and buses, the above pollutants shall be examined after diluting the total exhaust gas with conditioned ambient air. Using the engine torque and speed feedback signals of the engine dynamometer, the power shall be integrated with respect to time of the cycle resulting in the work produced by the engine over the cycle. The concentration of NO_x and HC shall be determined over the cycle by integration of the analyser signal. The concentration of CO, CO₂, and NMHC may be determined by integration of the analyser signal or by bag sampling. For particulates, a proportional sample shall be collected on suitable filters. The diluted exhaust gas flow rate shall be determined over the cycle to calculate the mass emission values of the pollutants. The mass emission values shall be related to the engine work to get the grams of each pollutant emitted per kilowatt hour, as described in Appendix 2 to this Annex.

2. TEST CONDITIONS U.K.

2.1. Engine test conditions U.K.

2.1.1. The absolute temperature (T_a) of the engine air at the inlet to the engine expressed in Kelvin, and the dry atmospheric pressure (p_s), expressed in kPa shall be measured and the parameter F shall be determined according to the following provisions: U.K.

(a)

for diesel engines:

• Naturally aspirated and mechanically supercharged engines:

  

• Turbocharged engines with or without cooling of the intake air:

  

(b)

for gas engines:

2.1.2. Test validity U.K.

For a test to be recognised as valid, the parameter F shall be such that:

2.2. Engines with charge air cooling U.K.

The charge air temperature shall be recorded and shall be, at the speed of the declared maximum power and full load, within ± 5 K of the maximum charge air temperature specified in Annex II, Appendix 1, Section 1.16.3. The temperature of the cooling medium shall be at least 293 K (20 °C).

If a test shop system or external blower is used, the charge air temperature shall be within ± 5 K of the maximum charge air temperature specified in Annex II, Appendix 1, Section 1.16.3 at the speed of the declared maximum power and full load. The setting of the charge air cooler for meeting the above conditions shall be used for the whole test cycle.

2.3. Engine air intake system U.K.

An engine air intake system shall be used presenting an air intake restriction within ± 100 Pa of the upper limit of the engine operating at the speed at the declared maximum power and full load.

2.4. Engine exhaust system U.K.

An exhaust system shall be used presenting an exhaust back pressure within ± 1 000 Pa of the upper limit of the engine operating at the speed of declared maximum power and full load and a volume within ± 40 % of that specified by the manufacturer. A test shop system may be used, provided it represents actual engine operating conditions. The exhaust system shall conform to the requirements for exhaust gas sampling, as set out in Annex III, Appendix 4, Section 3.4 and in Annex V, Section 2.2.1, EP and Section 2.3.1, EP.

If the engine is equipped with an exhaust aftertreatment device, the exhaust pipe must have the same diameter as found in-use for at least 4 pipe diameters upstream to the inlet of the beginning of the expansion section containing the aftertreatment device. The distance from the exhaust manifold flange or turbocharger outlet to the exhaust aftertreatment device shall be the same as in the vehicle configuration or within the distance specifications of the manufacturer. The exhaust backpressure or restriction shall follow the same criteria as above, and may be set with a valve. The aftertreatment container may be removed during dummy tests and during engine mapping, and replaced with an equivalent container having an inactive catalyst support.

2.5. Cooling system U.K.

An engine cooling system with sufficient capacity to maintain the engine at normal operating temperatures prescribed by the manufacturer shall be used.

2.6. Lubricating oil U.K.

Specifications of the lubricating oil used for the test shall be recorded and presented with the results of the test, as specified in Annex II, Appendix 1, Section 7.1.

2.7. Fuel U.K.

The fuel shall be the reference fuel specified in Annex IV.

The fuel temperature and measuring point shall be specified by the manufacturer within the limits given in Annex II, Appendix 1, Section 1.16.5. The fuel temperature shall not be lower than 306 K (33 °C). If not specified, it shall be 311 K ± 5 K (38 °C ± 5 °C) at the inlet to the fuel supply.

For NG and LPG fuelled engines, the fuel temperature and measuring point shall be within the limits given in Annex II, Appendix 1, Section 1.16.5 or in Annex II, Appendix 3, Section 1.16.5 in cases where the engine is not a parent engine.

2.8. Testing of exhaust aftertreatment systems U.K.

If the engine is equipped with an exhaust aftertreatment system, the emissions measured on the test cycle(s) shall be representative of the emissions in the field. If this cannot be achieved with one single test cycle (e.g. for particulate filters with periodic regeneration), several test cycles shall be conducted and the test results averaged and/or weighted. The exact procedure shall be agreed by the engine manufacturer and the Technical Service based upon good engineering judgement.

Appendix 1 ESC AND ELR TEST CYCLES

1. ENGINE AND DYNAMOMETER SETTINGS U.K.

1.1. Determination of engine speeds A, B and C U.K.

The engine speeds A, B and C shall be declared by the manufacturer in accordance with the following provisions:

The high speed n_hi shall be determined by calculating 70 % of the declared maximum net power P(n), as determined in Annex II, Appendix 1, Section 8.2. The highest engine speed where this power value occurs on the power curve is defined as n_hi.

The low speed n_lo shall be determined by calculating 50 % of the declared maximum net power P(n), as determined in Annex II, Appendix 1, Section 8.2. The lowest engine speed where this power value occurs on the power curve is defined as n_lo.

The engine speeds A, B and C shall be calculated as follows:

The engine speeds A, B and C may be verified by either of the following methods:

(a)

additional test points shall be measured during engine power approval according to Directive 80/1269/EEC for an accurate determination of n_hi and n_lo. The maximum power, n_hi and n_lo shall be determined from the power curve, and engine speeds A, B and C shall be calculated according to the above provisions;

(b)

the engine shall be mapped along the full load curve, from maximum no load speed to idle speed, using at least 5 measurement points per 1 000 rpm intervals and measurement points within ± 50 rpm of the speed at declared maximum power. The maximum power, n_hi and n_lo shall be determined from this mapping curve, and engine speeds A, B and C shall be calculated according to the above provisions.

If the measured engine speeds A, B and C are within ± 3 % of the engine speeds as declared by the manufacturer, the declared engine speeds shall be used for the emissions test. If the tolerance is exceeded for any of the engine speeds, the measured engine speeds shall be used for the emissions test.

1.2. Determination of dynamometer settings U.K.

The torque curve at full load shall be determined by experimentation to calculate the torque values for the specified test modes under net conditions, as specified in Annex II, Appendix 1, Section 8.2. The power absorbed by engine-driven equipment, if applicable, shall be taken into account. The dynamometer setting for each test mode shall be calculated using the formula:

if tested under net conditions

if not tested under net conditions

where:

s

=

dynamometer setting, kW

P(n)

=

net engine power as indicated in Annex II, Appendix 1, Section 8.2, kW

L

=

per cent load as indicated in Section 2.7.1, %

P(a)

=

power absorbed by auxiliaries to be fitted as indicated in Annex II, Appendix 1, Section 6.1

P(b)

=

power absorbed by auxiliaries to be removed as indicated in Annex II, Appendix 1, Section 6.2

2. ESC TEST RUN U.K.

At the manufacturers request, a dummy test may be run for conditioning of the engine and exhaust system before the measurement cycle.

2.1. Preparation of the sampling filters U.K.

At least one hour before the test, each filter (pair) shall be placed in a closed, but unsealed petri dish and placed in a weighing chamber for stabilisation. At the end of the stabilisation period, each filter (pair) shall be weighed and the tare weight shall be recorded. The filter (pair) shall then be stored in a closed Petri dish or sealed filter holder until needed for testing. If the filter (pair) is not used within eight hours of its removal from the weighing chamber, it must be conditioned and reweighed before use.

2.2. Installation of the measuring equipment U.K.

The instrumentation and sample probes shall be installed as required. When using a full flow dilution system for exhaust gas dilution, the tailpipe shall be connected to the system.

2.3. Starting the dilution system and the engine U.K.

The dilution system and the engine shall be started and warmed up until all temperatures and pressures have stabilised at maximum power according to the recommendation of the manufacturer and good engineering practice.

2.4. Starting the particulate sampling system U.K.

The particulate sampling system shall be started and running on by-pass. The particulate background level of the dilution air may be determined by passing dilution air through the particulate filters. If filtered dilution air is used, one measurement may be done prior to or after the test. If the dilution air is not filtered, measurements at the beginning and at the end of the cycle, may be done, and the values averaged.

2.5. Adjustment of the dilution ratio U.K.

The dilution air shall be set such that the temperature of the diluted exhaust gas measured immediately prior to the primary filter shall not exceed 325 K (52 °C) at any mode. The dilution ratio (q) shall not be less than 4.

For systems that use CO₂ or NO_x concentration measurement for dilution ratio control, the CO₂ or NO_x content of the dilution air must be measured at the beginning and at the end of each test. The pre- and post-test background CO₂ or NO_x concentration measurements of the dilution air must be within 100 ppm or 5 ppm of each other, respectively.

2.6. Checking the analysers U.K.

The emission analysers shall be set at zero and spanned.

2.7. Test cycle U.K.

2.7.1. The following 13-mode cycle shall be followed in dynamometer operation on the test engine U.K.

Mode number	Engine speed	Percent load	Weighting factor	Mode length
1	idle	—	0,15	4 minutes
2	A	100	0,08	2 minutes
3	B	50	0,1	2 minutes
4	B	75	0,1	2 minutes
5	A	50	0,05	2 minutes
6	A	75	0,05	2 minutes
7	A	25	0,05	2 minutes
8	B	100	0,09	2 minutes
9	B	25	0,1	2 minutes
10	C	100	0,08	2 minutes
11	C	25	0,05	2 minutes
12	C	75	0,05	2 minutes
13	C	50	0,05	2 minutes

2.7.2. Test sequence U.K.

The test sequence shall be started. The test shall be performed in the order of the mode numbers as set out in Section 2.7.1.

The engine must be operated for the prescribed time in each mode, completing engine speed and load changes in the first 20 seconds. The specified speed shall be held to within ± 50 rpm and the specified torque shall be held to within ± 2 % of the maximum torque at the test speed.

At the manufacturers request, the test sequence may be repeated a sufficient number of times for sampling more particulate mass on the filter. The manufacturer shall supply a detailed description of the data evaluation and calculation procedures. The gaseous emissions shall only be determined on the first cycle.

2.7.3. Analyser response U.K.

The output of the analysers shall be recorded on a strip chart recorder or measured with an equivalent data acquisition system with the exhaust gas flowing through the analysers throughout the test cycle.

2.7.4. Particulate sampling U.K.

One pair of filters (primary and back-up filters, see Annex III, Appendix 4) shall be used for the complete test procedure. The modal weighting factors specified in the test cycle procedure shall be taken into account by taking a sample proportional to the exhaust mass flow during each individual mode of the cycle. This can be achieved by adjusting sample flow rate, sampling time, and/or dilution ratio, accordingly, so that the criterion for the effective weighting factors in Section 5.6 is met.

The sampling time per mode must be at least 4 seconds per 0,01 weighting factor. Sampling must be conducted as late as possible within each mode. Particulate sampling shall be completed no earlier than 5 seconds before the end of each mode.

2.7.5. Engine conditions U.K.

The engine speed and load, intake air temperature and depression, exhaust temperature and backpressure, fuel flow and air or exhaust flow, charge air temperature, fuel temperature and humidity shall be recorded during each mode, with the speed and load requirements (see Section 2.7.2) being met during the time of particulate sampling, but in any case during the last minute of each mode.

Any additional data required for calculation shall be recorded (see Sections 4 and 5).

2.7.6. NO_x check within the control area U.K.

The NO_x check within the control area shall be performed immediately upon completion of mode 13.

The engine shall be conditioned at mode 13 for a period of three minutes before the start of the measurements. Three measurements shall be made at different locations within the control area, selected by the Technical Service(2). The time for each measurement shall be 2 minutes.

The measurement procedure is identical to the NO_x measurement on the 13-mode cycle, and shall be carried out in accordance with Sections 2.7.3, 2.7.5, and 4.1 of this Appendix, and Annex III, Appendix 4, Section 3.

The calculation shall be carried out in accordance with Section 4.

2.7.7. Rechecking the analysers U.K.

After the emission test a zero gas and the same span gas shall be used for rechecking. The test will be considered acceptable if the difference between the pre-test and post-test results is less than 2 % of the span gas value.

3. ELR TEST RUN U.K.

3.1. Installation of the measuring equipment U.K.

The opacimeter and sample probes, if applicable, shall be installed after the exhaust silencer or any aftertreatment device, if fitted, according to the general installation procedures specified by the instrument manufacturer. Additionally, the requirements of Section 10 of ISO IDS 11614 shall be observed, where appropriate.

Prior to any zero and full scale checks, the opacimeter shall be warmed up and stabilised according to the instrument manufacturer's recommendations. If the opacimeter is equipped with a purge air system to prevent sooting of the meter optics, this system shall also be activated and adjusted according to the manufacturer's recommendations.

3.2. Checking of the opacimeter U.K.

The zero and full scale checks shall be made in the opacity readout mode, since the opacity scale offers two truly definable calibration points, namely 0 % opacity and 100 % opacity. The light absorption coefficient is then correctly calculated based upon the measured opacity and the L_A, as submitted by the opacimeter manufacturer, when the instrument is returned to the k readout mode for testing.

With no blockage of the opacimeter light beam, the readout shall be adjusted to 0,0 % ± 1,0 % opacity. With the light being prevented from reaching the receiver, the readout shall be adjusted to 100,0 % ± 1,0 % opacity.

3.3. Test cycle U.K.

3.3.1. Conditioning of the engine U.K.

Warming up of the engine and the system shall be at maximum power in order to stabilise the engine parameters according to the recommendation of the manufacturer. The preconditioning phase should also protect the actual measurement against the influence of deposits in the exhaust system from a former test.

When the engine is stabilised, the cycle shall be started within 20 ± 2 s after the preconditioning phase. At the manufacturers request, a dummy test may be run for additional conditioning before the measurement cycle.

3.3.2. Test sequence U.K.

The test consists of a sequence of three load steps at each of the three engine speeds A (cycle 1), B (cycle 2) and C (cycle 3) determined in accordance with Annex III, Section 1.1, followed by cycle 4 at a speed within the control area and a load between 10 % and 100 %, selected by the Technical Service(3). The following sequence shall be followed in dynamometer operation on the test engine, as shown in Figure 3.

(a)

The engine shall be operated at engine speed A and 10 per cent load for 20 ± 2 s. The specified speed shall be held to within ± 20 rpm and the specified torque shall be held to within ± 2 % of the maximum torque at the test speed.

(b)

At the end of the previous segment, the speed control lever shall be moved rapidly to, and held in, the wide open position for 10 ± 1 s. The necessary dynamometer load shall be applied to keep the engine speed within ± 150 rpm during the first 3 s, and within ± 20 rpm during the rest of the segment.

(c)

The sequence described in (a) and (b) shall be repeated two times.

(d)

Upon completion of the third load step, the engine shall be adjusted to engine speed B and 10 per cent load within 20 ± 2 s.

(e)

The sequence (a) to (c) shall be run with the engine operating at engine speed B.

(f)

Upon completion of the third load step, the engine shall be adjusted to engine speed C and 10 per cent load within 20 ± 2 s.

(g)

The sequence (a) to (c) shall be run with the engine operating at engine speed C.

(h)

Upon completion of the third load step, the engine shall be adjusted to the selected engine speed and any load above 10 per cent within 20 ± 2 s.

(i)

The sequence (a) to (c) shall be run with the engine operating at the selected engine speed.

3.4. Cycle validation U.K.

The relative standard deviations of the mean smoke values at each test speed (SV_A, SV_B, SV_C, as calculated in accordance with Section 6.3.3 of this Appendix from the three successive load steps at each test speed) shall be lower than 15 % of the mean value, or 10 % of the limit value shown in Table 1 of Annex I, whichever is greater. If the difference is greater, the sequence shall be repeated until three successive load steps meet the validation criteria.

3.5. Rechecking of the opacimeter U.K.

The post-test opacimeter zero drift value shall not exceed ± 5,0 % of the limit value shown in Table 1 of Annex I.

4. CALCULATION OF THE GASEOUS EMISSIONS U.K.

4.1. Data evaluation U.K.

For the evaluation of the gaseous emissions, the chart reading of the last 30 seconds of each mode shall be averaged, and the average concentrations (conc) of HC, CO and NO_x during each mode shall be determined from the average chart readings and the corresponding calibration data. A different type of recording can be used if it ensures an equivalent data acquisition.

For the NO_x check within the control area, the above requirements apply for NO_x, only.

The exhaust gas flow G_EXHW or the diluted exhaust gas flow G_TOTW, if used optionally, shall be determined in accordance with Annex III, Appendix 4, Section 2.3.

4.2. Dry/wet correction U.K.

The measured concentration shall be converted to a wet basis according to the following formulae, if not already measured on a wet basis.

For the raw exhaust gas:

and,

For the diluted exhaust gas:

or,

For the dilution air	For the intake air (if different from the dilution air)

where:

H_a, H_d

=

g water per kg dry air

R_d, R_a

=

relative humidity of the dilution/intake air, %

p_d, p_a

=

saturation vapour pressure of the dilution/intake air, kPa

p_B

=

total barometric pressure, kPa

4.3. NO_x correction for humidity and temperature U.K.

As the NO_x emission depends on ambient air conditions, the NO_x concentration shall be corrected for ambient air temperature and humidity with the factors given in the following formulae:

with:

A

=

0,309 G_FUEL/G_AIRD - 0,0266

B

=

- 0,209 G_FUEL/G_AIRD + 0,00954

T_a

=

temperature of the air, K

H_a

=

humidity of the intake air, g water per kg dry air

H_a

=

in which

R_a

=

relative humidity of the intake air, %

p_a

=

saturation vapour pressure of the intake air, kPa

p_B

=

total barometric pressure, kPa

4.4. Calculation of the emission mass flow rates U.K.

The emission mass flow rates (g/h) for each mode shall be calculated as follows, assuming the exhaust gas density to be 1,293 kg/m³ at 273 K (0 C) and 101,3 kPa:

• 

  [(1)]

• 

  [(2)]

• 

  [(3)]

where NO_{x conc}, CO_conc, HC_conc (4) are the average concentrations (ppm) in the raw exhaust gas, as determined in Section 4.1.

If, optionally, the gaseous emissions are determined with a full flow dilution system, the following formulae shall be applied:

• 

  [(1)]

• 

  [(2)]

• 

  [(3)]

where NO_{x conc}, CO_conc, HC_conc (4) are the average background corrected concentrations (ppm) of each mode in the diluted exhaust gas, as determined in Annex III, Appendix 2, Section 4.3.1.1.

4.5. Calculation of the specific emissions U.K.

The emissions (g/kWh) shall be calculated for all individual components in the following way:

The weighting factors (WF) used in the above calculation are according to Section 2.7.1.

4.6. Calculation of the area control values U.K.

For the three control points selected according to Section 2.7.6, the NO_x emission shall be measured and calculated according to Section 4.6.1 and also determined by interpolation from the modes of the test cycle closest to the respective control point according to Section 4.6.2. The measured values are then compared to the interpolated values according to Section 4.6.3. U.K.

4.6.1. Calculation of the specific emission U.K.

The NO_x emission for each of the control points (Z) shall be calculated as follows:

4.6.2. Determination of the emission value from the test cycle U.K.

The NO_x emission for each of the control points shall be interpolated from the four closest modes of the test cycle that envelop the selected control point Z as shown in Figure 4. For these modes (R, S, T, U), the following definitions apply:

Speed(R)

=

Speed(T) = n_RT

Speed(S)

=

Speed(U) = n_SU

Per cent load(R)

=

Per cent load(S)

Per cent load(T)

=

Per cent load(U).

The NO_x emission of the selected control point Z shall be calculated as follows:

and:

where,

E_R, E_S, E_T, E_U

=

specific NO_x emission of the enveloping modes calculated in accordance with Section 4.6.1.

M_R, M_S, M_T, M_U

=

engine torque of the enveloping modes

4.6.3. Comparison of NO_x emission values U.K.

The measured specific NO_x emission of the control point Z (NO_x,Z) is compared to the interpolated value (E_Z) as follows:

5. CALCULATION OF THE PARTICULATE EMISSION U.K.

5.1. Data evaluation U.K.

For the evaluation of the particulates, the total sample masses (M_SAM,i) through the filters shall be recorded for each mode.

The filters shall be returned to the weighing chamber and conditioned for at least one hour, but not more than 80 hours, and then weighed. The gross weight of the filters shall be recorded and the tare weight (see Section 1 of this Appendix) subtracted. The particulate mass M_f is the sum of the particulate masses collected on the primary and back-up filters.

If background correction is to be applied, the dilution air mass (M_DIL) through the filters and the particulate mass (M_d) shall be recorded. If more than one measurement was made, the quotient M_d/M_DIL must be calculated for each single measurement and the values averaged.

5.2. Partial flow dilution system U.K.

The final reported test results of the particulate emission shall be determined through the following steps. Since various types of dilution rate control may be used, different calculation methods for G_EDFW apply. All calculations shall be based upon the average values of the individual modes during the sampling period. U.K.

5.2.1. Isokinetic systems U.K.

where r corresponds to the ratio of the cross-sectional areas of the isokinetic probe and the exhaust pipe:

5.2.2. Systems with measurement of CO₂ or NO_x concentration U.K.

where:

conc_E

=

wet concentration of the tracer gas in the raw exhaust

conc_D

=

wet concentration of the tracer gas in the diluted exhaust

conc_A

=

wet concentration of the tracer gas in the dilution air

Concentrations measured on a dry basis shall be converted to a wet basis according to Section 4.2 of this Appendix.

5.2.3. Systems with CO₂ measurement and carbon balance method(5) U.K.

where:

CO_2D

=

CO₂ concentration of the diluted exhaust

CO_2A

=

CO₂ concentration of the dilution air

(concentrations in vol % on wet basis)

This equation is based upon the carbon balance assumption (carbon atoms supplied to the engine are emitted as CO₂) and determined through the following steps:

and

5.2.4. Systems with flow measurement U.K.

5.3. Full flow dilution system U.K.

The reported test results of the particulate emission shall be determined through the following steps. All calculations shall be based upon the average values of the individual modes during the sampling period.

5.4. Calculation of the particulate mass flow rate U.K.

The particulate mass flow rate shall be calculated as follows:

where

=

M_SAM

=

i

=

determined over the test cycle by summation of the average values of the individual modes during the sampling period.

The particulate mass flow rate may be background corrected as follows:

If more than one measurement is made, shall be replaced with .

for the individual modes

or,

for the individual modes.

5.5. Calculation of the specific emission U.K.

The particulate emission shall be calculated in the following way:

5.6. Effective weighting factor U.K.

The effective weighting factor WF_E,i for each mode shall be calculated in the following way:

The value of the effective weighting factors shall be within ± 0,003 (± 0,005 for the idle mode) of the weighting factors listed in Section 2.7.1.

6. CALCULATION OF THE SMOKE VALUES U.K.

6.1. Bessel algorithm U.K.

The Bessel algorithm shall be used to compute the 1 s average values from the instantaneous smoke readings, converted in accordance with Section 6.3.1. The algorithm emulates a low pass second order filter, and its use requires iterative calculations to determine the coefficients. These coefficients are a function of the response time of the opacimeter system and the sampling rate. Therefore, Section 6.1.1 must be repeated whenever the system response time and/or sampling rate changes. U.K.

6.1.1. Calculation of filter response time and Bessel constants U.K.

The required Bessel response time (t_F) is a function of the physical and electrical response times of the opacimeter system, as specified in Annex III, Appendix 4, Section 5.2.4, and shall be calculated by the following equation:

where:

t_p

=

physical response time, s

t_e

=

electrical response time, s

The calculations for estimating the filter cut-off frequency (f_c) are based on a step input 0 to 1 in ≤ 0,01 s (see Annex VII). The response time is defined as the time between when the Bessel output reaches 10 % (t₁₀) and when it reaches 90 % (t₉₀) of this step function. This must be obtained by iterating on f_c until t₉₀-t₁₀≈t_F. The first iteration for f_c is given by the following formula:

The Bessel constants E and K shall be calculated by the following equations:

where:

D

=

0,618034

Δt

=

Ω

=

6.1.2. Calculation of the Bessel algorithm U.K.

Using the values of E and K, the 1 s Bessel averaged response to a step input S_i shall be calculated as follows:

where:

S_i-2

=

S_i-1 = 0

S_i

=

1

Y_i-2

=

Y_i-1 = 0

The times t₁₀ and t₉₀ shall be interpolated. The difference in time between t₉₀ and t₁₀ defines the response time t_F for that value of f_c. If this response time is not close enough to the required response time, iteration shall be continued until the actual response time is within 1 % of the required response as follows:

6.2. Data evaluation U.K.

The smoke measurement values shall be sampled with a minimum rate of 20 Hz.

6.3. Determination of smoke U.K.

6.3.1. Data conversion U.K.

Since the basic measurement unit of all opacimeters is transmittance, the smoke values shall be converted from transmittance (τ) to the light absorption coefficient (k) as follows:

and

where:

k

=

light absorption coefficient, m^-1

L_A

=

effective optical path length, as submitted by instrument manufacturer, m

N

=

opacity, %

τ

=

transmittance, %

The conversion shall be applied, before any further data processing is made.

6.3.2. Calculation of Bessel averaged smoke U.K.

The proper cut-off frequency f_c is the one that produces the required filter response time t_F. Once this frequency has been determined through the iterative process of Section 6.1.1, the proper Bessel algorithm constants E and K shall be calculated. The Bessel algorithm shall then be applied to the instantaneous smoke trace (k-value), as described in Section 6.1.2:

The Bessel algorithm is recursive in nature. Thus, it needs some initial input values of S_i-1 and S_i-2 and initial output values Y_i-1 and Y_i-2 to get the algorithm started. These may be assumed to be 0.

For each load step of the three speeds A, B and C, the maximum 1s value Y_max shall be selected from the individual Y_i values of each smoke trace.

6.3.3. Final result U.K.

The mean smoke values (SV) from each cycle (test speed) shall be calculated as follows:

For test speed A:

SV_A = (Y_max1,A + Y_max2,A + Y_max3,A) / 3

For test speed B:

SV_B = (Y_max1,B + Y_max2,B + Y_max3,B) / 3

For test speed C:

SV_C = (Y_max1,C + Y_max2,C + Y_max3,C) / 3

where:

Y_max1, Y_max2, Y_max3

=

highest 1 s Bessel averaged smoke value at each of the three load steps

The final value shall be calculated as follows:

SV = (0,43 x SV_A) + (0,56 x SV_B) + (0,01 x SV_C)

Appendix 2 ETC TEST CYCLE

1. ENGINE MAPPING PROCEDURE U.K.

1.1. Determination of the mapping speed range U.K.

For generating the ETC on the test cell, the engine needs to be mapped prior to the test cycle for determining the speed vs torque curve. The minimum and maximum mapping speeds are defined as follows:

Minimum mapping speed

=

idle speed

Maximum mapping speed

=

n_hi × 1,02 or speed where full load torque drops off to zero, whichever is lower

1.2. Performing the engine power map U.K.

The engine shall be warmed up at maximum power in order to stabilise the engine parameters according to the recommendation of the manufacturer and good engineering practice. When the engine is stabilised, the engine map shall be performed as follows:

(a)

the engine shall be unloaded and operated at idle speed;

(b)

the engine shall be operated at full load setting of the injection pump at minimum mapping speed;

(c)

the engine speed shall be increased at an average rate of 8 ± 1 min^-1 /s from minimum to maximum mapping speed. Engine speed and torque points shall be recorded at a sample rate of a least one point per second.

1.3. Mapping curve generation U.K.

All data points recorded under Section 1.2 shall be connected using linear interpolation between points. The resulting torque curve is the mapping curve and shall be used to convert the normalised torque values of the engine cycle into actual torque values for the test cycle, as described in Section 2.

1.4. Alternate mapping U.K.

If a manufacturer believes that the above mapping techniques are unsafe or unrepresentative for any given engine, alternate mapping techniques may be used. These alternate techniques must satisfy the intent of the specified mapping procedures to determine the maximum available torque at all engine speeds achieved during the test cycles. Deviations from the mapping techniques specified in this section for reasons of safety or representativeness shall be approved by the Technical Service along with the justification for their use. In no case, however, shall descending continual sweeps of engine speed be used for governed or turbocharged engines.

1.5. Replicate tests U.K.

An engine need not be mapped before each and every test cycle. An engine shall be remapped prior to a test cycle if:

• an unreasonable amount of time has transpired since the last map, as determined by engineering judgement,

  or

• physical changes or recalibrations have been made to the engine which may potentially affect engine performance.

2. GENERATION OF THE REFERENCE TEST CYCLE U.K.

The transient test cycle is described in Appendix 3 to this Annex. The normalised values for torque and speed shall be changed to the actual values, as follows, resulting in the reference cycle. U.K.

2.1. Actual speed U.K.

The speed shall be unnormalised using the following equation:

The reference speed (n_ref) corresponds to the 100 % speed values specified in the engine dynamometer schedule of Appendix 3. It is defined as follows (see Figure 1 of Annex I):

where n_hi and n_lo are either specified according to Annex I, Section 2 or determined according to Annex III, Appendix 1, Section 1.1.

2.2. Actual torque U.K.

The torque is normalised to the maximum torque at the respective speed. The torque values of the reference cycle shall be unnormalised, using the mapping curve determined according to Section 1.3, as follows:

Actual torque = (% torque × max. torque/100)

for the respective actual speed as determined in Section 2.1.

The negative torque values of the motoring points (‘m’) shall take on, for purposes of reference cycle generation, unnormalised values determined in either of the following ways:

• negative 40 % of the positive torque available at the associated speed point,

• mapping of the negative torque required to motor the engine from minimum to maximum mapping speed,

• determination of the negative torque required to motor the engine at idle and reference speeds and linear interpolation between these two points.

2.3. Example of the unnormalisation procedure U.K.

As an example, the following test point shall be unnormalised:

% speed

=

43

% torque

=

82

Given the following values:

reference speed

=

2 200 min^-1

idle speed

=

600 min^-1

results in,

actual speed = (43 × (2 200 - 600)/100) + 600 = 1 288 min^-1

actual torque = (82 × 700/100) = 574 Nm

where the maximum torque observed from the mapping curve at 1 288 min^-1 is 700 Nm.

3. EMISSIONS TEST RUN U.K.

At the manufacturers request, a dummy test may be run for conditioning of the engine and exhaust system before the measurement cycle. U.K.

NG and LPG fuelled engines shall be run-in using the ETC test. The engine shall be run over a minimum of two ETC cycles and until the CO emission measured over one ETC cycle does not exceed by more than 10 % the CO emission measured over the previous ETC cycle.

3.1. Preparation of the sampling filters (diesel engines only) U.K.

At least one hour before the test, each filter (pair) shall be placed in a closed, but unsealed Petri dish and placed in a weighing chamber for stabilisation. At the end of the stabilisation period, each filter (pair) shall be weighed and the tare weight shall be recorded. The filter (pair) shall then be stored in a closed Petri dish or sealed filter holder until needed for testing. If the filter (pair) is not used within eight hours of its removal from the weighing chamber, it must be conditioned and reweighed before use.

3.2. Installation of the measuring equipment U.K.

The instrumentation and sample probes shall be installed as required. The tailpipe shall be connected to the full flow dilution system.

3.3. Starting the dilution system and the engine U.K.

The dilution system and the engine shall be started and warmed up until all temperatures and pressures have stabilised at maximum power according to the recommendation of the manufacturer and good engineering practice.

3.4. Starting the particulate sampling system (diesel engines only) U.K.

The particulate sampling system shall be started and running on by-pass. The particulate background level of the dilution air may be determined by passing dilution air through the particulate filters. If filtered dilution air is used, one measurement may be done prior to or after the test. If the dilution air is not filtered, measurements at the beginning and at the end of the cycle, may be done, and the values averaged.

3.5. Adjustment of the full flow dilution system U.K.

The total diluted exhaust gas flow shall be set to eliminate water condensation in the system, and to obtain a maximum filter face temperature of 325 K (52 °C) or less (see Annex V, Section 2.3.1, DT).

3.6. Checking the analysers U.K.

The emission analysers shall be set at zero and spanned. If sample bags are used, they shall be evacuated.

3.7. Engine starting procedure U.K.

The stabilised engine shall be started according to the manufacturer's recommended starting procedure in the owner's manual, using either a production starter motor or the dynamometer. Optionally, the test may start directly from the engine preconditioning phase without shutting the engine off, when the engine has reached the idle speed.

3.8. Test cycle U.K.

3.8.1. Test sequence U.K.

The test sequence shall be started, if the engine has reached idle speed. The test shall be performed according to the reference cycle as set out in Section 2 of this Appendix. Engine speed and torque command set points shall be issued at 5 Hz (10 Hz recommended) or greater. Feedback engine speed and torque shall be recorded at least once every second during the test cycle, and the signals may be electronically filtered.

3.8.2. Analyser response U.K.

At the start of the engine or test sequence, if the cycle is started directly from the preconditioning, the measuring equipment shall be started, simultaneously:

• start collecting or analysing dilution air;

• start collecting or analysing diluted exhaust gas;

• start measuring the amount of diluted exhaust gas (CVS) and the required temperatures and pressures;

• start recording the feedback data of speed and torque of the dynamometer.

HC and NO_x shall be measured continuously in the dilution tunnel with a frequency of 2 Hz. The average concentrations shall be determined by integrating the analyser signals over the test cycle. The system response time shall be no greater than 20 s, and shall be coordinated with CVS flow fluctuations and sampling time/test cycle offsets, if necessary. CO, CO₂, NMHC and CH₄ shall be determined by integration or by analysing the concentrations in the sample bag, collected over the cycle. The concentrations of the gaseous pollutants in the dilution air shall be determined by integration or by collecting into the background bag. All other values shall be recorded with a minimum of one measurement per second (1 Hz).

3.8.3. Particulate sampling (diesel engines only) U.K.

At the start of the engine or test sequence, if the cycle is started directly from the preconditioning, the particulate sampling system shall be switched from by-pass to collecting particulates.

If no flow compensation is used, the sample pump(s) shall be adjusted so that the flow rate through the particulate sample probe or transfer tube is maintained at a value within ± 5 % of the set flow rate. If flow compensation (i.e. proportional control of sample flow) is used, it must be demonstrated that the ratio of main tunnel flow to particulate sample flow does not change by more than ± 5 % of its set value (except for the first 10 seconds of sampling).

Note: For double dilution operation, sample flow is the net difference between the flow rate through the sample filters and the secondary dilution air flow rate. U.K.

The average temperature and pressure at the gas meter(s) or flow instrumentation inlet shall be recorded. If the set flow rate cannot be maintained over the complete cycle (within ± 5 %) because of high particulate loading on the filter, the test shall be voided. The test shall be rerun using a lower flow rate and/or a larger diameter filter.

3.8.4. Engine stalling U.K.

If the engine stalls anywhere during the test cycle, the engine shall be preconditioned and restarted, and the test repeated. If a malfunction occurs in any of the required test equipment during the test cycle, the test shall be voided.

3.8.5. Operations after test U.K.

At the completion of the test, the measurement of the diluted exhaust gas volume, the gas flow into the collecting bags and the particulate sample pump shall be stopped. For an integrating analyser system, sampling shall continue until system response times have elapsed.

The concentrations of the collecting bags, if used, shall be analysed as soon as possible and in any case not later than 20 minutes after the end of the test cycle.

After the emission test, a zero gas and the same span gas shall be used for re-checking the analysers. The test will be considered acceptable if the difference between the pre-test and post-test results is less than 2 % of the span gas value.

For diesel engines only, the particulate filters shall be returned to the weighing chamber no later than one hour after completion of the test and shall be conditioned in a closed, but unsealed Petri dish for at least one hour, but not more than 80 hours before weighing.

3.9. Verification of the test run U.K.

3.9.1. Data shift U.K.

To minimise the biasing effect of the time lag between the feedback and reference cycle values, the entire engine speed and torque feedback signal sequence may be advanced or delayed in time with respect to the reference speed and torque sequence. If the feedback signals are shifted, both speed and torque must be shifted the same amount in the same direction.

3.9.2. Calculation of the cycle work U.K.

The actual cycle work W_act (kWh) shall be calculated using each pair of engine feedback speed and torque values recorded. This shall be done after any feedback data shift has occurred, if this option is selected. The actual cycle work W_act is used for comparison to the reference cycle work W_ref and for calculating the brake specific emissions (see Sections 4.4 and 5.2). The same methodology shall be used for integrating both reference and actual engine power. If values are to be determined between adjacent reference or adjacent measured values, linear interpolation shall be used.

In integrating the reference and actual cycle work, all negative torque values shall be set equal to zero and included. If integration is performed at a frequency of less than 5 Hertz, and if, during a given time segment, the torque value changes from positive to negative or negative to positive, the negative portion shall be computed and set equal to zero. The positive portion shall be included in the integrated value.

W_act shall be between - 15 % and + 5 % of W_ref

3.9.3. Validation statistics of the test cycle U.K.

Linear regressions of the feedback values on the reference values shall be performed for speed, torque and power. This shall be done after any feedback data shift has occurred, if this option is selected. The method of least squares shall be used, with the best fit equation having the form:

where:

y

=

feedback (actual) value of speed (min^-1), torque (Nm), or power (kW)

m

=

slope of the regression line

x

=

reference value of speed (min^-1), torque (Nm), or power (kW)

b

=

y intercept of the regression line

The standard error of estimate (SE) of y on x and the coefficient of determination (r²) shall be calculated for each regression line.

It is recommended that this analysis be performed at 1 Hertz. All negative reference torque values and the associated feedback values shall be deleted from the calculation of cycle torque and power validation statistics. For a test to be considered valid, the criteria of Table 6 must be met.

Table 6

Regression line tolerances

a Until 1 October 2005, the figures shown in brackets may be used for the type-approval testing of gas engines. The Commission shall report on the development of gas engine technology to confirm or modify the regression line tolerances applicable to gas engines given in this table.
	Speed	Torque	Power
Standard error of estimate (SE) of Y on X	Max 100 min–1	Max 13 % (15 %)a of power map maximum engine torque	Max 8 % (15 %)a of power map maximum engine power
Slope of the regression line, m	0,95 to 1,03	0,83–1,03	0,89–1,03 (0,83–1,03)a
Coefficient of determination, r2	min 0,9700 (min 0,9500)a	min 0,8800 (min 0,7500)a	min 0,9100 (min 0,7500)a
Y intercept of the regression line, b	± 50 min-1	± 20 Nm or ± 2 % (± 20 Nm or ± 3 %)a of max torque whichever is greater	± 4 kW or ± 2 % (± 4 kW or ± 3 %)a of max power whichever is greater

Point deletions from the regression analyses are permitted where noted in Table 7.

Table 7

Permitted point deletions from regression analysis

Conditions	Points to be deleted
Full load and torque feedback < torque reference	Torque and/or power
No load, not an idle point, and torque feedback > torque reference	Torque and/or power
No load/closed throttle, idle point and speed > reference idle speed	Speed and/or power

4. CALCULATION OF THE GASEOUS EMISSIONS U.K.

4.1. Determination of the diluted exhaust gas flow U.K.

The total diluted exhaust gas flow over the cycle (kg/test) shall be calculated from the measurement values over the cycle and the corresponding calibration data of the flow measurement device (V₀ for PDP or K_V for CFV, as determined in Annex III, Appendix 5, Section 2). The following formulae shall be applied, if the temperature of the diluted exhaust is kept constant over the cycle by using a heat exchanger (± 6 K for a PDP-CVS, ± 11 K for a CFV-CVS, see Annex V, Section 2.3).

For the PDP-CVS system:

M_TOTW = 1,293 × V₀ × N_p × (p_B – p₁) × 273 / (101,3 × T)

where:

M_TOTW

=

mass of the diluted exhaust gas on wet basis over the cycle, kg

V₀

=

volume of gas pumped per revolution under test conditions, m³/rev

N_P

=

total revolutions of pump per test

p_B

=

atmospheric pressure in the test cell, kPa

p₁

=

pressure depression below atmospheric at pump inlet, kPa

T

=

average temperature of the diluted exhaust gas at pump inlet over the cycle, K

For the CFV-CVS system:

M_TOTW = 1,293 × t × K_v × p_A / T^0,5

where:

M_TOTW

=

mass of the diluted exhaust gas on wet basis over the cycle, kg

t

=

cycle time, s

K_v

=

calibration coefficient of the critical flow venturi for standard conditions

p_A

=

absolute pressure at venturi inlet, kPa

T

=

absolute temperature at venturi inlet, K

If a system with flow compensation is used (i.e. without heat exchanger), the instantaneous mass emissions shall be calculated and integrated over the cycle. In this case, the instantaneous mass of the diluted exhaust gas shall be calculated as follows:

For the PDP-CVS system:

M_TOTW,i = 1,293 × V₀ × N_p,i × (p_B – p₁) × 273 / (101,3 × T)

where:

M_TOTW,i

=

instantaneous mass of the diluted exhaust gas on wet basis, kg

N_p,i

=

total revolutions of pump per time interval

For the CFV-CVS system:

M_TOTW,i = 1,293 × Δt_i × K_v × p_A / T^0,5

where:

M_TOTW,i

=

instantaneous mass of the diluted exhaust gas on wet basis, kg

Δt_i

=

time interval, s

If the total sample mass of particulates (M_SAM) and gaseous pollutants exceeds 0,5 % of the total CVS flow (M_TOTW), the CVS flow shall be corrected for M_SAM or the particulate sample flow shall be returned to the CVS prior to the flow measuring device (PDP or CFV).

4.2. NO_x correction for humidity U.K.

As the NO_x emission depends on ambient air conditions, the NO_x concentration shall be corrected for ambient air humidity with the factors given in the following formulae:

(a)

for diesel engines:

(b)

for gas engines:

where:

H_a

=

humidity of the intake air water per kg dry air

in which:

R_a

=

relative humidity of the intake air, %

p_a

=

saturation vapour pressure of the intake air, kPa

p_B

=

total barometric pressure, kPa

4.3. Calculation of the emission mass flow U.K.

4.3.1. Systems with constant mass flow U.K.

For systems with heat exchanger, the mass of the pollutants (g/test) shall be determined from the following equations:

• 

  [(1)]

• 

  [(2)]

• 

  [(3)]

• 

  [(4)]

• 

  [(5)]

• 

  [(6)]

• 

  [(7)]

where:

NO_{x conc}, CO_conc, HC_conc (6), NMHC_conc

=

average background corrected concentrations over the cycle from integration (mandatory for NO_x and HC) or bag measurement, ppm

M_TOTW

=

total mass of diluted exhaust gas over the cycle as determined in Section 4.1, kg

K_H,D

=

humidity correction factor for diesel engines as determined in Section 4.2

K_H,G

=

humidity correction factor for gas engines as determined in Section 4.2

Concentrations measured on a dry basis shall be converted to a wet basis in accordance with Annex III, Appendix 1, Section 4.2.

The determination of NMHC_conc depends on the method used (see Annex III, Appendix 4, Section 3.3.4). In both cases, the CH₄ concentration shall be determined and subtracted from the HC concentration as follows:

(a)

GC method

(b)

NMC method

where:

HC(wCutter)

=

HC concentration with the sample gas flowing through the NMC

HC(w/oCutter)

=

HC concentration with the sample gas bypassing the NMC

CE_M

=

methane efficiency as determined per Annex III, Appendix 5, Section 1.8.4.1

CE_E

=

ethane efficiency as determined per Annex III, Appendix 5, Section 1.8.4.2

4.3.1.1. Determination of the background corrected concentrations U.K.

The average background concentration of the gaseous pollutants in the dilution air shall be subtracted from measured concentrations to get the net concentrations of the pollutants. The average values of the background concentrations can be determined by the sample bag method or by continuous measurement with integration. The following formula shall be used.

where:

conc

=

concentration of the respective pollutant in the diluted exhaust gas, corrected by the amount of the respective pollutant contained in the dilution air, ppm

conc_e

=

concentration of the respective pollutant measured in the diluted exhaust gas, ppm

conc_d

=

concentration of the respective pollutant measured in the dilution air, ppm

DF

=

dilution factor

The dilution factor shall be calculated as follows:

(a)

for diesel and LPG fuelled gas engines

(b)

for NG-fuelled gas engines

where:

CO_{2, conce}

=

concentration of CO₂ in the diluted exhaust gas, % vol

HC_conce

=

concentration of HC in the diluted exhaust gas, ppm C1

NMHC_conce

=

concentration of NMHC in the diluted exhaust gas, ppm C1

CO_conce

=

concentration of CO in the diluted exhaust gas, ppm

F_S

=

stoichiometric factor

Concentrations measured on dry basis shall be converted to a wet basis in accordance with Annex III, Appendix 1, Section 4.2.

The stoichiometric factor shall be calculated as follows:

where:

x, y

=

fuel composition C_xH_y

Alternatively, if the fuel composition is not known, the following stoichiometric factors may be used:

F_S (diesel)

=

13,4

F_S (LPG)

=

11,6

F_S (NG)

=

9,5

4.3.2. Systems with flow compensation U.K.

For systems without heat exchanger, the mass of the pollutants (g/test) shall be determined by calculating the instantaneous mass emissions and integrating the instantaneous values over the cycle. Also, the background correction shall be applied directly to the instantaneous concentration value. The following formulae shall be applied:

• 

  [(1)]

• 

  [(2)]

• 

  [(3)]

• 

  [(4)]

• 

  [(5)]

• 

  [(6)]

• 

  [(7)]

where:

conc_e

=

concentration of the respective pollutant measured in the diluted exhaust gas, ppm

conc_d

=

concentration of the respective pollutant measured in the dilution air, ppm

M_TOTW,i

=

instantaneous mass of the diluted exhaust gas (see Section 4.1), kg

M_TOTW

=

total mass of diluted exhaust gas over the cycle (see Section 4.1), kg

K_H,D

=

humidity correction factor for diesel engines as determined in Section 4.2

K_H,G

=

humidity correction factor for gas engines as determined in Section 4.2

DF

=

dilution factor as determined in Section 4.3.1.1

4.4. Calculation of the specific emissions U.K.

The emissions (g/kWh) shall be calculated for all individual components in the following way:

(diesel and gas engines)

(diesel and gas engines)

(diesel and LPG fuelled gas engines)

(NG fuelled gas engines)

(NG fuelled gas engines)

where:

W_act

=

actual cycle work as determined in Section 3.9.2, kWh

5. CALCULATION OF THE PARTICULATE EMISSION (DIESEL ENGINES ONLY) U.K.

5.1. Calculation of the mass flow U.K.

The particulate mass (g/test) shall be calculated as follows:

where:

M_f

=

particulate mass sampled over the cycle, mg

M_TOTW

=

total mass of diluted exhaust gas over the cycle as determined in Section 4.1, kg

M_SAM

=

mass of diluted exhaust gas taken from the dilution tunnel for collecting particulates, kg

and:

M_f

=

M_f,p + M_f,b if weighed separately, mg

M_f,p

=

particulate mass collected on the primary filter, mg

M_f,b

=

particulate mass collected on the back-up filter, mg

If a double dilution system is used, the mass of the secondary dilution air shall be subtracted from the total mass of the double diluted exhaust gas sampled through the particulate filters

where:

M_TOT

=

mass of double diluted exhaust gas through particulate filter, kg

M_SEC

=

mass of secondary dilution air, kg

If the particulate background level of the dilution air is determined in accordance with Section 3.4, the particulate mass may be background corrected. In this case, the particulate mass (g/test) shall be calculated as follows:

where:

M_f, M_SAM, M_TOTW

=

see above

M_DIL

=

mass of primary dilution air sampled by background particulate sampler, kg

M_d

=

mass of the collected background particulates of the primary dilution air, mg

DF

=

dilution factor as determined in Section 4.3.1.1

5.2. Calculation of the specific emission U.K.

The particulate emission (g/kWh) shall be calculated in the following way:

where:

W_act

=

actual cycle work as determined in Section 3.9.2, kWh.

Appendix 3

ETC ENGINE DYNAMOMETER SCHEDULE

‘m’ = motoring.
Times	Normal speed%	Normal torque%
1	0	0
2	0	0
3	0	0
4	0	0
5	0	0
6	0	0
7	0	0
8	0	0
9	0	0
10	0	0
11	0	0
12	0	0
13	0	0
14	0	0
15	0	0
16	0,1	1,5
17	23,1	21,5
18	12,6	28,5
19	21,8	71
20	19,7	76,8
21	54,6	80,9
22	71,3	4,9
23	55,9	18,1
24	72	85,4
25	86,7	61,8
26	51,7	0
27	53,4	48,9
28	34,2	87,6
29	45,5	92,7
30	54,6	99,5
31	64,5	96,8
32	71,7	85,4
33	79,4	54,8
34	89,7	99,4
35	57,4	0
36	59,7	30,6
37	90,1	‘m’
38	82,9	‘m’
39	51,3	‘m’
40	28,5	‘m’
41	29,3	‘m’
42	26,7	‘m’
43	20,4	‘m’
44	14,1	0
45	6,5	0
46	0	0
47	0	0
48	0	0
49	0	0
50	0	0
51	0	0
52	0	0
53	0	0
54	0	0
55	0	0
56	0	0
57	0	0
58	0	0
59	0	0
60	0	0
61	0	0
62	25,5	11,1
63	28,5	20,9
64	32	73,9
65	4	82,3
66	34,5	80,4
67	64,1	86
68	58	0
69	50,3	83,4
70	66,4	99,1
71	81,4	99,6
72	88,7	73,4
73	52,5	0
74	46,4	58,5
75	48,6	90,9
76	55,2	99,4
77	62,3	99
78	68,4	91,5
79	74,5	73,7
80	38	0
81	41,8	89,6
82	47,1	99,2
83	52,5	99,8
84	56,9	80,8
85	58,3	11,8
86	56,2	‘m’
87	52	‘m’
88	43,3	‘m’
89	36,1	‘m’
90	27,6	‘m’
91	21,1	‘m’
92	8	0
93	0	0
94	0	0
95	0	0
96	0	0
97	0	0
98	0	0
99	0	0
100	0	0
101	0	0
102	0	0
103	0	0
104	0	0
105	0	0
106	0	0
107	0	0
108	11,6	14,8
109	0	0
110	27,2	74,8
111	17	76,9
112	36	78
113	59,7	86
114	80,8	17,9
115	49,7	0
116	65,6	86
117	78,6	72,2
118	64,9	‘m’
119	44,3	‘m’
120	51,4	83,4
121	58,1	97
122	69,3	99,3
123	72	20,8
124	72,1	‘m’
125	65,3	‘m’
126	64	‘m’
127	59,7	‘m’
128	52,8	‘m’
129	45,9	‘m’
130	38,7	‘m’
131	32,4	‘m’
132	27	‘m’
133	21,7	‘m’
134	19,1	0,4
135	34,7	14
136	16,4	48,6
137	0	11,2
138	1,2	2,1
139	30,1	19,3
140	30	73,9
141	54,4	74,4
142	77,2	55,6
143	58,1	0
144	45	82,1
145	68,7	98,1
146	85,7	67,2
147	60,2	0
148	59,4	98
149	72,7	99,6
150	79,9	45
151	44,3	0
152	41,5	84,4
153	56,2	98,2
154	65,7	99,1
155	74,4	84,7
156	54,4	0
157	47,9	89,7
158	54,5	99,5
159	62,7	96,8
160	62,3	0
161	46,2	54,2
162	44,3	83,2
163	48,2	13,3
164	51	‘m’
165	50	‘m’
166	49,2	‘m’
167	49,3	‘m’
168	49,9	‘m’
169	51,6	‘m’
170	49,7	‘m’
171	48,5	‘m’
172	50,3	72,5
173	51,1	84,5
174	54,6	64,8
175	56,6	76,5
176	58	‘m’
177	53,6	‘m’
178	40,8	‘m’
179	32,9	‘m’
180	26,3	‘m’
181	20,9	‘m’
182	10	0
183	0	0
184	0	0
185	0	0
186	0	0
187	0	0
188	0	0
189	0	0
190	0	0
191	0	0
192	0	0
193	0	0
194	0	0
195	0	0
196	0	0
197	0	0
198	0	0
199	0	0
200	0	0
201	0	0
202	0	0
203	0	0
204	0	0
205	0	0
206	0	0
207	0	0
208	0	0
209	0	0
210	0	0
211	0	0
212	0	0
213	0	0
214	0	0
215	0	0
216	0	0
217	0	0
218	0	0
219	0	0
220	0	0
221	0	0
222	0	0
223	0	0
224	0	0
225	21,2	62,7
226	30,8	75,1
227	5,9	82,7
228	34,6	80,3
229	59,9	87
230	84,3	86,2
231	68,7	‘m’
232	43,6	‘m’
233	41,5	85,4
234	49,9	94,3
235	60,8	99
236	70,2	99,4
237	81,1	92,4
238	49,2	0
239	56	86,2
240	56,2	99,3
241	61,7	99
242	69,2	99,3
243	74,1	99,8
244	72,4	8,4
245	71,3	0
246	71,2	9,1
247	67,1	‘m’
248	65,5	‘m’
249	64,4	‘m’
250	62,9	25,6
251	62,2	35,6
252	62,9	24,4
253	58,8	‘m’
254	56,9	‘m’
255	54,5	‘m’
256	51,7	17
257	56,2	78,7
258	59,5	94,7
259	65,5	99,1
260	71,2	99,5
261	76,6	99,9
262	79	0
263	52,9	97,5
264	53,1	99,7
265	59	99,1
266	62,2	99
267	65	99,1
268	69	83,1
269	69,9	28,4
270	70,6	12,5
271	68,9	8,4
272	69,8	9,1
273	69,6	7
274	65,7	‘m’
275	67,1	‘m’
276	66,7	‘m’
277	65,6	‘m’
278	64,5	‘m’
279	62,9	‘m’
280	59,3	‘m’
281	54,1	‘m’
282	51,3	‘m’
283	47,9	‘m’
284	43,6	‘m’
285	39,4	‘m’
286	34,7	‘m’
287	29,8	‘m’
288	20,9	73,4
289	36,9	‘m’
290	35,5	‘m’
291	20,9	‘m’
292	49,7	11,9
293	42,5	‘m’
294	32	‘m’
295	23,6	‘m’
296	19,1	0
297	15,7	73,5
298	25,1	76,8
299	34,5	81,4
300	44,1	87,4
301	52,8	98,6
302	63,6	99
303	73,6	99,7
304	62,2	‘m’
305	29,2	‘m’
306	46,4	22
307	47,3	13,8
308	47,2	12,5
309	47,9	11,5
310	47,8	35,5
311	49,2	83,3
312	52,7	96,4
313	57,4	99,2
314	61,8	99
315	66,4	60,9
316	65,8	‘m’
317	59	‘m’
318	50,7	‘m’
319	41,8	‘m’
320	34,7	‘m’
321	28,7	‘m’
322	25,2	‘m’
323	43	24,8
324	38,7	0
325	48,1	31,9
326	40,3	61
327	42,4	52,1
328	46,4	47,7
329	46,9	30,7
330	46,1	23,1
331	45,7	23,2
332	45,5	31,9
333	46,4	73,6
334	51,3	60,7
335	51,3	51,1
336	53,2	46,8
337	53,9	50
338	53,4	52,1
339	53,8	45,7
340	50,6	22,1
341	47,8	26
342	41,6	17,8
343	38,7	29,8
344	35,9	71,6
345	34,6	47,3
346	34,8	80,3
347	35,9	87,2
348	38,8	90,8
349	41,5	94,7
350	47,1	99,2
351	53,1	99,7
352	46,4	0
353	42,5	0,7
354	43,6	58,6
355	47,1	87,5
356	54,1	99,5
357	62,9	99
358	72,6	99,6
359	82,4	99,5
360	88	99,4
361	46,4	0
362	53,4	95,2
363	58,4	99,2
364	61,5	99
365	64,8	99
366	68,1	99,2
367	73,4	99,7
368	73,3	29,8
369	73,5	14,6
370	68,3	0
371	45,4	49,9
372	47,2	75,7
373	44,5	9
374	47,8	10,3
375	46,8	15,9
376	46,9	12,7
377	46,8	8,9
378	46,1	6,2
379	46,1	‘m’
380	45,5	‘m’
381	44,7	‘m’
382	43,8	‘m’
383	41	‘m’
384	41,1	6,4
385	38	6,3
386	35,9	0,3
387	33,5	0
388	53,1	48,9
389	48,3	‘m’
390	49,9	‘m’
391	48	‘m’
392	45,3	‘m’
393	41,6	3,1
394	44,3	79
395	44,3	89,5
396	43,4	98,8
397	44,3	98,9
398	43	98,8
399	42,2	98,8
400	42,7	98,8
401	45	99
402	43,6	98,9
403	42,2	98,8
404	44,8	99
405	43,4	98,8
406	45	99
407	42,2	54,3
408	61,2	31,9
409	56,3	72,3
410	59,7	99,1
411	62,3	99
412	67,9	99,2
413	69,5	99,3
414	73,1	99,7
415	77,7	99,8
416	79,7	99,7
417	82,5	99,5
418	85,3	99,4
419	86,6	99,4
420	89,4	99,4
421	62,2	0
422	52,7	96,4
423	50,2	99,8
424	49,3	99,6
425	52,2	99,8
426	51,3	100
427	51,3	100
428	51,1	100
429	51,1	100
430	51,8	99,9
431	51,3	100
432	51,1	100
433	51,3	100
434	52,3	99,8
435	52,9	99,7
436	53,8	99,6
437	51,7	99,9
438	53,5	99,6
439	52	99,8
440	51,7	99,9
441	53,2	99,7
442	54,2	99,5
443	55,2	99,4
444	53,8	99,6
445	53,1	99,7
446	55	99,4
447	57	99,2
448	61,5	99
449	59,4	5,7
450	59	0
451	57,3	59,8
452	64,1	99
453	70,9	90,5
454	58	0
455	41,5	59,8
456	44,1	92,6
457	46,8	99,2
458	47,2	99,3
459	51	100
460	53,2	99,7
461	53,1	99,7
462	55,9	53,1
463	53,9	13,9
464	52,5	‘m’
465	51,7	‘m’
466	51,5	52,2
467	52,8	80
468	54,9	95
469	57,3	99,2
470	60,7	99,1
471	62,4	‘m’
472	60,1	‘m’
473	53,2	‘m’
474	44	‘m’
475	35,2	‘m’
476	30,5	‘m’
477	26,5	‘m’
478	22,5	‘m’
479	20,4	‘m’
480	19,1	‘m’
481	19,1	‘m’
482	13,4	‘m’
483	6,7	‘m’
484	3,2	‘m’
485	14,3	63,8
486	34,1	0
487	23,9	75,7
488	31,7	79,2
489	32,1	19,4
490	35,9	5,8
491	36,6	0,8
492	38,7	‘m’
493	38,4	‘m’
494	39,4	‘m’
495	39,7	‘m’
496	40,5	‘m’
497	40,8	‘m’
498	39,7	‘m’
499	39,2	‘m’
500	38,7	‘m’
501	32,7	‘m’
502	30,1	‘m’
503	21,9	‘m’
504	12,8	0
505	0	0
506	0	0
507	0	0
508	0	0
509	0	0
510	0	0
511	0	0
512	0	0
513	0	0
514	30,5	25,6
515	19,7	56,9
516	16,3	45,1
517	27,2	4,6
518	21,7	1,3
519	29,7	28,6
520	36,6	73,7
521	61,3	59,5
522	40,8	0
523	36,6	27,8
524	39,4	80,4
525	51,3	88,9
526	58,5	11,1
527	60,7	‘m’
528	54,5	‘m’
529	51,3	‘m’
530	45,5	‘m’
531	40,8	‘m’
532	38,9	‘m’
533	36,6	‘m’
534	36,1	72,7
535	44,8	78,9
536	51,6	91,1
537	59,1	99,1
538	66	99,1
539	75,1	99,9
540	81	8
541	39,1	0
542	53,8	89,7
543	59,7	99,1
544	64,8	99
545	70,6	96,1
546	72,6	19,6
547	72	6,3
548	68,9	0,1
549	67,7	‘m’
550	66,8	‘m’
551	64,3	16,9
552	64,9	7
553	63,6	12,5
554	63	7,7
555	64,4	38,2
556	63	11,8
557	63,6	0
558	63,3	5
559	60,1	9,1
560	61	8,4
561	59,7	0,9
562	58,7	‘m’
563	56	‘m’
564	53,9	‘m’
565	52,1	‘m’
566	49,9	‘m’
567	46,4	‘m’
568	43,6	‘m’
569	40,8	‘m’
570	37,5	‘m’
571	27,8	‘m’
572	17,1	0,6
573	12,2	0,9
574	11,5	1,1
575	8,7	0,5
576	8	0,9
577	5,3	0,2
578	4	0
579	3,9	0
580	0	0
581	0	0
582	0	0
583	0	0
584	0	0
585	0	0
586	0	0
587	8,7	22,8
588	16,2	49,4
589	23,6	56
590	21,1	56,1
591	23,6	56
592	46,2	68,8
593	68,4	61,2
594	58,7	‘m’
595	31,6	‘m’
596	19,9	8,8
597	32,9	70,2
598	43	79
599	57,4	98,9
600	72,1	73,8
601	53	0
602	48,1	86
603	56,2	99
604	65,4	98,9
605	72,9	99,7
606	67,5	‘m’
607	39	‘m’
608	41,9	38,1
609	44,1	80,4
610	46,8	99,4
611	48,7	99,9
612	50,5	99,7
613	52,5	90,3
614	51	1,8
615	50	‘m’
616	49,1	‘m’
617	47	‘m’
618	43,1	‘m’
619	39,2	‘m’
620	40,6	0,5
621	41,8	53,4
622	44,4	65,1
623	48,1	67,8
624	53,8	99,2
625	58,6	98,9
626	63,6	98,8
627	68,5	99,2
628	72,2	89,4
629	77,1	0
630	57,8	79,1
631	60,3	98,8
632	61,9	98,8
633	63,8	98,8
634	64,7	98,9
635	65,4	46,5
636	65,7	44,5
637	65,6	3,5
638	49,1	0
639	50,4	73,1
640	50,5	‘m’
641	51	‘m’
642	49,4	‘m’
643	49,2	‘m’
644	48,6	‘m’
645	47,5	‘m’
646	46,5	‘m’
647	46	11,3
648	45,6	42,8
649	47,1	83
650	46,2	99,3
651	47,9	99,7
652	49,5	99,9
653	50,6	99,7
654	51	99,6
655	53	99,3
656	54,9	99,1
657	55,7	99
658	56	99
659	56,1	9,3
660	55,6	‘m’
661	55,4	‘m’
662	54,9	51,3
663	54,9	59,8
664	54	39,3
665	53,8	‘m’
666	52	‘m’
667	50,4	‘m’
668	50,6	0
669	49,3	41,7
670	50	73,2
671	50,4	99,7
672	51,9	99,5
673	53,6	99,3
674	54,6	99,1
675	56	99
676	55,8	99
677	58,4	98,9
678	59,9	98,8
679	60,9	98,8
680	63	98,8
681	64,3	98,9
682	64,8	64
683	65,9	46,5
684	66,2	28,7
685	65,2	1,8
686	65	6,8
687	63,6	53,6
688	62,4	82,5
689	61,8	98,8
690	59,8	98,8
691	59,2	98,8
692	59,7	98,8
693	61,2	98,8
694	62,2	49,4
695	62,8	37,2
696	63,5	46,3
697	64,7	72,3
698	64,7	72,3
699	65,4	77,4
700	66,1	69,3
701	64,3	‘m’
702	64,3	‘m’
703	63	‘m’
704	62,2	‘m’
705	61,6	‘m’
706	62,4	‘m’
707	62,2	‘m’
708	61	‘m’
709	58,7	‘m’
710	55,5	‘m’
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714	47,9	‘m’
715	46,2	‘m’
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717	45,6	34,5
718	45,5	37,1
719	43,8	‘m’
720	41,9	‘m’
721	41,3	‘m’
722	41,4	‘m’
723	41,2	‘m’
724	41,8	‘m’
725	41,8	‘m’
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727	45	29
728	44,2	‘m’
729	43,9	‘m’
730	38	10,7
731	56,8	‘m’
732	57,1	‘m’
733	52	‘m’
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735	40,2	‘m’
736	39,2	16,5
737	38,9	73,2
738	39,9	89,8
739	42,3	98,6
740	43,7	98,8
741	45,5	99,1
742	45,6	99,2
743	48,1	99,7
744	49	100
745	49,8	99,9
746	49,8	99,9
747	51,9	99,5
748	52,3	99,4
749	53,3	99,3
750	52,9	99,3
751	54,3	99,2
752	55,5	99,1
753	56,7	99
754	61,7	98,8
755	64,3	47,4
756	64,7	1,8
757	66,2	‘m’
758	49,1	‘m’
759	52,1	46
760	52,6	61
761	52,9	0
762	52,3	20,4
763	54,2	56,7
764	55,4	59,8
765	56,1	49,2
766	56,8	33,7
767	57,2	96
768	58,6	98,9
769	59,5	98,8
770	61,2	98,8
771	62,1	98,8
772	62,7	98,8
773	62,8	98,8
774	64	98,9
775	63,2	46,3
776	62,4	‘m’
777	60,3	‘m’
778	58,7	‘m’
779	57,2	‘m’
780	56,1	‘m’
781	56	9,3
782	55,2	26,3
783	54,8	42,8
784	55,7	47,1
785	56,6	52,4
786	58	50,3
787	58,6	20,6
788	58,7	‘m’
789	59,3	‘m’
790	58,6	‘m’
791	60,5	9,7
792	59,2	9,6
793	59,9	9,6
794	59,6	9,6
795	59,9	6,2
796	59,9	9,6
797	60,5	13,1
798	60,3	20,7
799	59,9	31
800	60,5	42
801	61,5	52,5
802	60,9	51,4
803	61,2	57,7
804	62,8	98,8
805	63,4	96,1
806	64,6	45,4
807	64,1	5
808	63	3,2
809	62,7	14,9
810	63,5	35,8
811	64,1	73,3
812	64,3	37,4
813	64,1	21
814	63,7	21
815	62,9	18
816	62,4	32,7
817	61,7	46,2
818	59,8	45,1
819	57,4	43,9
820	54,8	42,8
821	54,3	65,2
822	52,9	62,1
823	52,4	30,6
824	50,4	‘m’
825	48,6	‘m’
826	47,9	‘m’
827	46,8	‘m’
828	46,9	9,4
829	49,5	41,7
830	50,5	37,8
831	52,3	20,4
832	54,1	30,7
833	56,3	41,8
834	58,7	26,5
835	57,3	‘m’
836	59	‘m’
837	59,8	‘m’
838	60,3	‘m’
839	61,2	‘m’
840	61,8	‘m’
841	62,5	‘m’
842	62,4	‘m’
843	61,5	‘m’
844	63,7	‘m’
845	61,9	‘m’
846	61,6	29,7
847	60,3	‘m’
848	59,2	‘m’
849	57,3	‘m’
850	52,3	‘m’
851	49,3	‘m’
852	47,3	‘m’
853	46,3	38,8
854	46,8	35,1
855	46,6	‘m’
856	44,3	‘m’
857	43,1	‘m’
858	42,4	2,1
859	41,8	2,4
860	43,8	68,8
861	44,6	89,2
862	46	99,2
863	46,9	99,4
864	47,9	99,7
865	50,2	99,8
866	51,2	99,6
867	52,3	99,4
868	53	99,3
869	54,2	99,2
870	55,5	99,1
871	56,7	99
872	57,3	98,9
873	58	98,9
874	60,5	31,1
875	60,2	‘m’
876	60,3	‘m’
877	60,5	6,3
878	61,4	19,3
879	60,3	1,2
880	60,5	2,9
881	61,2	34,1
882	61,6	13,2
883	61,5	16,4
884	61,2	16,4
885	61,3	‘m’
886	63,1	‘m’
887	63,2	4,8
888	62,3	22,3
889	62	38,5
890	61,6	29,6
891	61,6	26,6
892	61,8	28,1
893	62	29,6
894	62	16,3
895	61,1	‘m’
896	61,2	‘m’
897	60,7	19,2
898	60,7	32,5
899	60,9	17,8
900	60,1	19,2
901	59,3	38,2
902	59,9	45
903	59,4	32,4
904	59,2	23,5
905	59,5	40,8
906	58,3	‘m’
907	58,2	‘m’
908	57,6	‘m’
909	57,1	‘m’
910	57	0,6
911	57	26,3
912	56,5	29,2
913	56,3	20,5
914	56,1	‘m’
915	55,2	‘m’
916	54,7	17,5
917	55,2	29,2
918	55,2	29,2
919	55,9	16
920	55,9	26,3
921	56,1	36,5
922	55,8	19
923	55,9	9,2
924	55,8	21,9
925	56,4	42,8
926	56,4	38
927	56,4	11
928	56,4	35,1
929	54	7,3
930	53,4	5,4
931	52,3	27,6
932	52,1	32
933	52,3	33,4
934	52,2	34,9
935	52,8	60,1
936	53,7	69,7
937	54	70,7
938	55,1	71,7
939	55,2	46
940	54,7	12,6
941	52,5	0
942	51,8	24,7
943	51,4	43,9
944	50,9	71,1
945	51,2	76,8
946	50,3	87,5
947	50,2	99,8
948	50,9	100
949	49,9	99,7
950	50,9	100
951	49,8	99,7
952	50,4	99,8
953	50,4	99,8
954	49,7	99,7
955	51	100
956	50,3	99,8
957	50,2	99,8
958	49,9	99,7
959	50,9	100
960	50	99,7
961	50,2	99,8
962	50,2	99,8
963	49,9	99,7
964	50,4	99,8
965	50,2	99,8
966	50,3	99,8
967	49,9	99,7
968	51,1	100
969	50,6	99,9
970	49,9	99,7
971	49,6	99,6
972	49,4	99,6
973	49	99,5
974	49,8	99,7
975	50,9	100
976	50,4	99,8
977	49,8	99,7
978	49,1	99,5
979	50,4	99,8
980	49,8	99,7
981	49,3	99,5
982	49,1	99,5
983	49,9	99,7
984	49,1	99,5
985	50,4	99,8
986	50,9	100
987	51,4	99,9
988	51,5	99,9
989	52,2	99,7
990	52,8	74,1
991	53,3	46
992	53,6	36,4
993	53,4	33,5
994	53,9	58,9
995	55,2	73,8
996	55,8	52,4
997	55,7	9,2
998	55,8	2,2
999	56,4	33,6
1000	55,4	‘m’
1001	55,2	‘m’
1002	55,8	26,3
1003	55,8	23,3
1004	56,4	50,2
1005	57,6	68,3
1006	58,8	90,2
1007	59,9	98,9
1008	62,3	98,8
1009	63,1	74,4
1010	63,7	49,4
1011	63,3	9,8
1012	48	0
1013	47,9	73,5
1014	49,9	99,7
1015	49,9	48,8
1016	49,6	2,3
1017	49,9	‘m’
1018	49,3	‘m’
1019	49,7	47,5
1020	49,1	‘m’
1021	49,4	‘m’
1022	48,3	‘m’
1023	49,4	‘m’
1024	48,5	‘m’
1025	48,7	‘m’
1026	48,7	‘m’
1027	49,1	‘m’
1028	49	‘m’
1029	49,8	‘m’
1030	48,7	‘m’
1031	48,5	‘m’
1032	49,3	31,3
1033	49,7	45,3
1034	48,3	44,5
1035	49,8	61
1036	49,4	64,3
1037	49,8	64,4
1038	50,5	65,6
1039	50,3	64,5
1040	51,2	82,9
1041	50,5	86
1042	50,6	89
1043	50,4	81,4
1044	49,9	49,9
1045	49,1	20,1
1046	47,9	24
1047	48,1	36,2
1048	47,5	34,5
1049	46,9	30,3
1050	47,7	53,5
1051	46,9	61,6
1052	46,5	73,6
1053	48	84,6
1054	47,2	87,7
1055	48,7	80
1056	48,7	50,4
1057	47,8	38,6
1058	48,8	63,1
1059	47,4	5
1060	47,3	47,4
1061	47,3	49,8
1062	46,9	23,9
1063	46,7	44,6
1064	46,8	65,2
1065	46,9	60,4
1066	46,7	61,5
1067	45,5	‘m’
1068	45,5	‘m’
1069	44,2	‘m’
1070	43	‘m’
1071	42,5	‘m’
1072	41	‘m’
1073	39,9	‘m’
1074	39,9	38,2
1075	40,1	48,1
1076	39,9	48
1077	39,4	59,3
1078	43,8	19,8
1079	52,9	0
1080	52,8	88,9
1081	53,4	99,5
1082	54,7	99,3
1083	56,3	99,1
1084	57,5	99
1085	59	98,9
1086	59,8	98,9
1087	60,1	98,9
1088	61,8	48,3
1089	61,8	55,6
1090	61,7	59,8
1091	62	55,6
1092	62,3	29,6
1093	62	19,3
1094	61,3	7,9
1095	61,1	19,2
1096	61,2	43
1097	61,1	59,7
1098	61,1	98,8
1099	61,3	98,8
1100	61,3	26,6
1101	60,4	‘m’
1102	58,8	‘m’
1103	57,7	‘m’
1104	56	‘m’
1105	54,7	‘m’
1106	53,3	‘m’
1107	52,6	23,2
1108	53,4	84,2
1109	53,9	99,4
1110	54,9	99,3
1111	55,8	99,2
1112	57,1	99
1113	56,5	99,1
1114	58,9	98,9
1115	58,7	98,9
1116	59,8	98,9
1117	61	98,8
1118	60,7	19,2
1119	59,4	‘m’
1120	57,9	‘m’
1121	57,6	‘m’
1122	56,3	‘m’
1123	55	‘m’
1124	53,7	‘m’
1125	52,1	‘m’
1126	51,1	‘m’
1127	49,7	25,8
1128	49,1	46,1
1129	48,7	46,9
1130	48,2	46,7
1131	48	70
1132	48	70
1133	47,2	67,6
1134	47,3	67,6
1135	46,6	74,7
1136	47,4	13
1137	46,3	‘m’
1138	45,4	‘m’
1139	45,5	24,8
1140	44,8	73,8
1141	46,6	99
1142	46,3	98,9
1143	48,5	99,4
1144	49,9	99,7
1145	49,1	99,5
1146	49,1	99,5
1147	51	100
1148	51,5	99,9
1149	50,9	100
1150	51,6	99,9
1151	52,1	99,7
1152	50,9	100
1153	52,2	99,7
1154	51,5	98,3
1155	51,5	47,2
1156	50,8	78,4
1157	50,3	83
1158	50,3	31,7
1159	49,3	31,3
1160	48,8	21,5
1161	47,8	59,4
1162	48,1	77,1
1163	48,4	87,6
1164	49,6	87,5
1165	51	81,4
1166	51,6	66,7
1167	53,3	63,2
1168	55,2	62
1169	55,7	43,9
1170	56,4	30,7
1171	56,8	23,4
1172	57	‘m’
1173	57,6	‘m’
1174	56,9	‘m’
1175	56,4	4
1176	57	23,4
1177	56,4	41,7
1178	57	49,2
1179	57,7	56,6
1180	58,6	56,6
1181	58,9	64
1182	59,4	68,2
1183	58,8	71,4
1184	60,1	71,3
1185	60,6	79,1
1186	60,7	83,3
1187	60,7	77,1
1188	60	73,5
1189	60,2	55,5
1190	59,7	54,4
1191	59,8	73,3
1192	59,8	77,9
1193	59,8	73,9
1194	60	76,5
1195	59,5	82,3
1196	59,9	82,8
1197	59,8	65,8
1198	59	48,6
1199	58,9	62,2
1200	59,1	70,4
1201	58,9	62,1
1202	58,4	67,4
1203	58,7	58,9
1204	58,3	57,7
1205	57,5	57,8
1206	57,2	57,6
1207	57,1	42,6
1208	57	70,1
1209	56,4	59,6
1210	56,7	39
1211	55,9	68,1
1212	56,3	79,1
1213	56,7	89,7
1214	56	89,4
1215	56	93,1
1216	56,4	93,1
1217	56,7	94,4
1218	56,9	94,8
1219	57	94,1
1220	57,7	94,3
1221	57,5	93,7
1222	58,4	93,2
1223	58,7	93,2
1224	58,2	93,7
1225	58,5	93,1
1226	58,8	86,2
1227	59	72,9
1228	58,2	59,9
1229	57,6	8,5
1230	57,1	47,6
1231	57,2	74,4
1232	57	79,1
1233	56,7	67,2
1234	56,8	69,1
1235	56,9	71,3
1236	57	77,3
1237	57,4	78,2
1238	57,3	70,6
1239	57,7	64
1240	57,5	55,6
1241	58,6	49,6
1242	58,2	41,1
1243	58,8	40,6
1244	58,3	21,1
1245	58,7	24,9
1246	59,1	24,8
1247	58,6	‘m’
1248	58,8	‘m’
1249	58,8	‘m’
1250	58,7	‘m’
1251	59,1	‘m’
1252	59,1	‘m’
1253	59,4	‘m’
1254	60,6	2,6
1255	59,6	‘m’
1256	60,1	‘m’
1257	60,6	‘m’
1258	59,6	4,1
1259	60,7	7,1
1260	60,5	‘m’
1261	59,7	‘m’
1262	59,6	‘m’
1263	59,8	‘m’
1264	59,6	4,9
1265	60,1	5,9
1266	59,9	6,1
1267	59,7	‘m’
1268	59,6	‘m’
1269	59,7	22
1270	59,8	10,3
1271	59,9	10
1272	60,6	6,2
1273	60,5	7,3
1274	60,2	14,8
1275	60,6	8,2
1276	60,6	5,5
1277	61	14,3
1278	61	12
1279	61,3	34,2
1280	61,2	17,1
1281	61,5	15,7
1282	61	9,5
1283	61,1	9,2
1284	60,5	4,3
1285	60,2	7,8
1286	60,2	5,9
1287	60,2	5,3
1288	59,9	4,6
1289	59,4	21,5
1290	59,6	15,8
1291	59,3	10,1
1292	58,9	9,4
1293	58,8	9
1294	58,9	35,4
1295	58,9	30,7
1296	58,9	25,9
1297	58,7	22,9
1298	58,7	24,4
1299	59,3	61
1300	60,1	56
1301	60,5	50,6
1302	59,5	16,2
1303	59,7	50
1304	59,7	31,4
1305	60,1	43,1
1306	60,8	38,4
1307	60,9	40,2
1308	61,3	49,7
1309	61,8	45,9
1310	62	45,9
1311	62,2	45,8
1312	62,6	46,8
1313	62,7	44,3
1314	62,9	44,4
1315	63,1	43,7
1316	63,5	46,1
1317	63,6	40,7
1318	64,3	49,5
1319	63,7	27
1320	63,8	15
1321	63,6	18,7
1322	63,4	8,4
1323	63,2	8,7
1324	63,3	21,6
1325	62,9	19,7
1326	63	22,1
1327	63,1	20,3
1328	61,8	19,1
1329	61,6	17,1
1330	61	0
1331	61,2	22
1332	60,8	40,3
1333	61,1	34,3
1334	60,7	16,1
1335	60,6	16,6
1336	60,5	18,5
1337	60,6	29,8
1338	60,9	19,5
1339	60,9	22,3
1340	61,4	35,8
1341	61,3	42,9
1342	61,5	31
1343	61,3	19,2
1344	61	9,3
1345	60,8	44,2
1346	60,9	55,3
1347	61,2	56
1348	60,9	60,1
1349	60,7	59,1
1350	60,9	56,8
1351	60,7	58,1
1352	59,6	78,4
1353	59,6	84,6
1354	59,4	66,6
1355	59,3	75,5
1356	58,9	49,6
1357	59,1	75,8
1358	59	77,6
1359	59	67,8
1360	59	56,7
1361	58,8	54,2
1362	58,9	59,6
1363	58,9	60,8
1364	59,3	56,1
1365	58,9	48,5
1366	59,3	42,9
1367	59,4	41,4
1368	59,6	38,9
1369	59,4	32,9
1370	59,3	30,6
1371	59,4	30
1372	59,4	25,3
1373	58,8	18,6
1374	59,1	18
1375	58,5	10,6
1376	58,8	10,5
1377	58,5	8,2
1378	58,7	13,7
1379	59,1	7,8
1380	59,1	6
1381	59,1	6
1382	59,4	13,1
1383	59,7	22,3
1384	60,7	10,5
1385	59,8	9,8
1386	60,2	8,8
1387	59,9	8,7
1388	61	9,1
1389	60,6	28,2
1390	60,6	22
1391	59,6	23,2
1392	59,6	19
1393	60,6	38,4
1394	59,8	41,6
1395	60	47,3
1396	60,5	55,4
1397	60,9	58,7
1398	61,3	37,9
1399	61,2	38,3
1400	61,4	58,7
1401	61,3	51,3
1402	61,4	71,1
1403	61,1	51
1404	61,5	56,6
1405	61	60,6
1406	61,1	75,4
1407	61,4	69,4
1408	61,6	69,9
1409	61,7	59,6
1410	61,8	54,8
1411	61,6	53,6
1412	61,3	53,5
1413	61,3	52,9
1414	61,2	54,1
1415	61,3	53,2
1416	61,2	52,2
1417	61,2	52,3
1418	61	48
1419	60,9	41,5
1420	61	32,2
1421	60,7	22
1422	60,7	23,3
1423	60,8	38,8
1424	61	40,7
1425	61	30,6
1426	61,3	62,6
1427	61,7	55,9
1428	62,3	43,4
1429	62,3	37,4
1430	62,3	35,7
1431	62,8	34,4
1432	62,8	31,5
1433	62,9	31,7
1434	62,9	29,9
1435	62,8	29,4
1436	62,7	28,7
1437	61,5	14,7
1438	61,9	17,2
1439	61,5	6,1
1440	61	9,9
1441	60,9	4,8
1442	60,6	11,1
1443	60,3	6,9
1444	60,8	7
1445	60,2	9,2
1446	60,5	21,7
1447	60,2	22,4
1448	60,7	31,6
1449	60,9	28,9
1450	59,6	21,7
1451	60,2	18
1452	59,5	16,7
1453	59,8	15,7
1454	59,6	15,7
1455	59,3	15,7
1456	59	7,5
1457	58,8	7,1
1458	58,7	16,5
1459	59,2	50,7
1460	59,7	60,2
1461	60,4	44
1462	60,2	35,3
1463	60,4	17,1
1464	59,9	13,5
1465	59,9	12,8
1466	59,6	14,8
1467	59,4	15,9
1468	59,4	22
1469	60,4	38,4
1470	59,5	38,8
1471	59,3	31,9
1472	60,9	40,8
1473	60,7	39
1474	60,9	30,1
1475	61	29,3
1476	60,6	28,4
1477	60,9	36,3
1478	60,8	30,5
1479	60,7	26,7
1480	60,1	4,7
1481	59,9	0
1482	60,4	36,2
1483	60,7	32,5
1484	59,9	3,1
1485	59,7	‘m’
1486	59,5	‘m’
1487	59,2	‘m’
1488	58,8	0,6
1489	58,7	‘m’
1490	58,7	‘m’
1491	57,9	‘m’
1492	58,2	‘m’
1493	57,6	‘m’
1494	58,3	9,5
1495	57,2	6
1496	57,4	27,3
1497	58,3	59,9
1498	58,3	7,3
1499	58,8	21,7
1500	58,8	38,9
1501	59,4	26,2
1502	59,1	25,5
1503	59,1	26
1504	59	39,1
1505	59,5	52,3
1506	59,4	31
1507	59,4	27
1508	59,4	29,8
1509	59,4	23,1
1510	58,9	16
1511	59	31,5
1512	58,8	25,9
1513	58,9	40,2
1514	58,8	28,4
1515	58,9	38,9
1516	59,1	35,3
1517	58,8	30,3
1518	59	19
1519	58,7	3
1520	57,9	0
1521	58	2,4
1522	57,1	‘m’
1523	56,7	‘m’
1524	56,7	5,3
1525	56,6	2,1
1526	56,8	‘m’
1527	56,3	‘m’
1528	56,3	‘m’
1529	56	‘m’
1530	56,7	‘m’
1531	56,6	3,8
1532	56,9	‘m’
1533	56,9	‘m’
1534	57,4	‘m’
1535	57,4	‘m’
1536	58,3	13,9
1537	58,5	‘m’
1538	59,1	‘m’
1539	59,4	‘m’
1540	59,6	‘m’
1541	59,5	‘m’
1542	59,6	0,5
1543	59,3	9,2
1544	59,4	11,2
1545	59,1	26,8
1546	59	11,7
1547	58,8	6,4
1548	58,7	5
1549	57,5	‘m’
1550	57,4	‘m’
1551	57,1	1,1
1552	57,1	0
1553	57	4,5
1554	57,1	3,7
1555	57,3	3,3
1556	57,3	16,8
1557	58,2	29,3
1558	58,7	12,5
1559	58,3	12,2
1560	58,6	12,7
1561	59	13,6
1562	59,8	21,9
1563	59,3	20,9
1564	59,7	19,2
1565	60,1	15,9
1566	60,7	16,7
1567	60,7	18,1
1568	60,7	40,6
1569	60,7	59,7
1570	61,1	66,8
1571	61,1	58,8
1572	60,8	64,7
1573	60,1	63,6
1574	60,7	83,2
1575	60,4	82,2
1576	60	80,5
1577	59,9	78,7
1578	60,8	67,9
1579	60,4	57,7
1580	60,2	60,6
1581	59,6	72,7
1582	59,9	73,6
1583	59,8	74,1
1584	59,6	84,6
1585	59,4	76,1
1586	60,1	76,9
1587	59,5	84,6
1588	59,8	77,5
1589	60,6	67,9
1590	59,3	47,3
1591	59,3	43,1
1592	59,4	38,3
1593	58,7	38,2
1594	58,8	39,2
1595	59,1	67,9
1596	59,7	60,5
1597	59,5	32,9
1598	59,6	20
1599	59,6	34,4
1600	59,4	23,9
1601	59,6	15,7
1602	59,9	41
1603	60,5	26,3
1604	59,6	14
1605	59,7	21,2
1606	60,9	19,6
1607	60,1	34,3
1608	59,9	27
1609	60,8	25,6
1610	60,6	26,3
1611	60,9	26,1
1612	61,1	38
1613	61,2	31,6
1614	61,4	30,6
1615	61,7	29,6
1616	61,5	28,8
1617	61,7	27,8
1618	62,2	20,3
1619	61,4	19,6
1620	61,8	19,7
1621	61,8	18,7
1622	61,6	17,7
1623	61,7	8,7
1624	61,7	1,4
1625	61,7	5,9
1626	61,2	8,1
1627	61,9	45,8
1628	61,4	31,5
1629	61,7	22,3
1630	62,4	21,7
1631	62,8	21,9
1632	62,2	22,2
1633	62,5	31
1634	62,3	31,3
1635	62,6	31,7
1636	62,3	22,8
1637	62,7	12,6
1638	62,2	15,2
1639	61,9	32,6
1640	62,5	23,1
1641	61,7	19,4
1642	61,7	10,8
1643	61,6	10,2
1644	61,4	‘m’
1645	60,8	‘m’
1646	60,7	‘m’
1647	61	12,4
1648	60,4	5,3
1649	61	13,1
1650	60,7	29,6
1651	60,5	28,9
1652	60,8	27,1
1653	61,2	27,3
1654	60,9	20,6
1655	61,1	13,9
1656	60,7	13,4
1657	61,3	26,1
1658	60,9	23,7
1659	61,4	32,1
1660	61,7	33,5
1661	61,8	34,1
1662	61,7	17
1663	61,7	2,5
1664	61,5	5,9
1665	61,3	14,9
1666	61,5	17,2
1667	61,1	‘m’
1668	61,4	‘m’
1669	61,4	8,8
1670	61,3	8,8
1671	61	18
1672	61,5	13
1673	61	3,7
1674	60,9	3,1
1675	60,9	4,7
1676	60,6	4,1
1677	60,6	6,7
1678	60,6	12,8
1679	60,7	11,9
1680	60,6	12,4
1681	60,1	12,4
1682	60,5	12
1683	60,4	11,8
1684	59,9	12,4
1685	59,6	12,4
1686	59,6	9,1
1687	59,9	0
1688	59,9	20,4
1689	59,8	4,4
1690	59,4	3,1
1691	59,5	26,3
1692	59,6	20,1
1693	59,4	35
1694	60,9	22,1
1695	60,5	12,2
1696	60,1	11
1697	60,1	8,2
1698	60,5	6,7
1699	60	5,1
1700	60	5,1
1701	60	9
1702	60,1	5,7
1703	59,9	8,5
1704	59,4	6
1705	59,5	5,5
1706	59,5	14,2
1707	59,5	6,2
1708	59,4	10,3
1709	59,6	13,8
1710	59,5	13,9
1711	60,1	18,9
1712	59,4	13,1
1713	59,8	5,4
1714	59,9	2,9
1715	60,1	7,1
1716	59,6	12
1717	59,6	4,9
1718	59,4	22,7
1719	59,6	22
1720	60,1	17,4
1721	60,2	16,6
1722	59,4	28,6
1723	60,3	22,4
1724	59,9	20
1725	60,2	18,6
1726	60,3	11,9
1727	60,4	11,6
1728	60,6	10,6
1729	60,8	16
1730	60,9	17
1731	60,9	16,1
1732	60,7	11,4
1733	60,9	11,3
1734	61,1	11,2
1735	61,1	25,6
1736	61	14,6
1737	61	10,4
1738	60,6	‘m’
1739	60,9	‘m’
1740	60,8	4,8
1741	59,9	‘m’
1742	59,8	‘m’
1743	59,1	‘m’
1744	58,8	‘m’
1745	58,8	‘m’
1746	58,2	‘m’
1747	58,5	14,3
1748	57,5	4,4
1749	57,9	0
1750	57,8	20,9
1751	58,3	9,2
1752	57,8	8,2
1753	57,5	15,3
1754	58,4	38
1755	58,1	15,4
1756	58,8	11,8
1757	58,3	8,1
1758	58,3	5,5
1759	59	4,1
1760	58,2	4,9
1761	57,9	10,1
1762	58,5	7,5
1763	57,4	7
1764	58,2	6,7
1765	58,2	6,6
1766	57,3	17,3
1767	58	11,4
1768	57,5	47,4
1769	57,4	28,8
1770	58,8	24,3
1771	57,7	25,5
1772	58,4	35,5
1773	58,4	29,3
1774	59	33,8
1775	59	18,7
1776	58,8	9,8
1777	58,8	23,9
1778	59,1	48,2
1779	59,4	37,2
1780	59,6	29,1
1781	50	25
1782	40	20
1783	30	15
1784	20	10
1785	10	5
1786	0	0
1787	0	0
1788	0	0
1789	0	0
1790	0	0
1791	0	0
1792	0	0
1793	0	0
1794	0	0
1795	0	0
1796	0	0
1797	0	0
1798	0	0
1799	0	0
1800	0	0

A graphical display of the ETC dynamometer schedule is shown in Figure 5.

Appendix 4 MEASUREMENT AND SAMPLING PROCEDURES

1. INTRODUCTION U.K.

Gaseous components, particulates, and smoke emitted by the engine submitted for testing shall be measured by the methods described in Annex V. The respective sections of Annex V describe the recommended analytical systems for the gaseous emissions (Section 1), the recommended particulate dilution and sampling systems (Section 2), and the recommended opacimeters for smoke measurement (Section 3). U.K.

For the ESC, the gaseous components shall be determined in the raw exhaust gas. Optionally, they may be determined in the diluted exhaust gas, if a full flow dilution system is used for particulate determination. Particulates shall be determined with either a partial flow or a full flow dilution system.

For the ETC, only a full flow dilution system shall be used for determining gaseous and particulate emissions, and is considered the reference system. However, partial flow dilution systems may be approved by the Technical Service, if their equivalency according to Section 6.2 to Annex I is proven, and if a detailed description of the data evaluation and calculation procedures is submitted to the Technical Service.

2. DYNAMOMETER AND TEST CELL EQUIPMENT U.K.

The following equipment shall be used for emission tests of engines on engine dynamometers. U.K.

2.1. Engine dynamometer U.K.

An engine dynamometer shall be used with adequate characteristics to perform the test cycles described in Appendices 1 and 2 to this Annex. The speed measuring system shall have an accuracy of ± 2 % of reading. The torque measuring system shall have an accuracy of ± 3 % of reading in the range > 20 % of full scale, and an accuracy of ± 0,6 % of full scale in the range ≤ 20 % of full scale.

2.2. Other instruments U.K.

Measuring instruments for fuel consumption, air consumption, temperature of coolant and lubricant, exhaust gas pressure and intake manifold depression, exhaust gas temperature, air intake temperature, atmospheric pressure, humidity and fuel temperature shall be used, as required. These instruments shall satisfy the requirements given in Table 8:

Table 8
Accuracy of measuring instruments
Measuring instrument	Accuracy
Fuel consumption	± 2 % of engine's maximum value
Air consumption	± 2 % of engine's maximum value
Temperatures ≤ 600 K (327 °C)	± 2 K absolute
Temperatures >600 K (327 °C)	± 1 % of reading
Atmospheric pressure	± 0,1 kPa absolute
Exhaust gas pressure	± 0,2 kPa absolute
Intake depression	± 0,05 kPa absolute
Other pressures	± 0,1 kPa absolute
Relative humidity	± 3 % absolute
Absolute humidity	± 5 % of reading

2.3. Exhaust gas flow U.K.

For calculation of the emissions in the raw exhaust, it is necessary to know the exhaust gas flow (see Section 4.4 of Appendix 1). For the determination of the exhaust flow either of the following methods may be used:

a)

direct measurement of the exhaust flow by flow nozzle or equivalent metering system;

b)

measurement of the air flow and the fuel flow by suitable metering systems and calculation of the exhaust flow by the following equation:

G_EXHW = G_AIRW + G_FUEL (for wet exhaust mass)

The accuracy of exhaust flow determination shall be ± 2,5 % of reading or better.

2.4. Diluted exhaust gas flow U.K.

For calculation of the emissions in the diluted exhaust using a full flow dilution system (mandatory for the ETC), it is necessary to know the diluted exhaust gas flow (see Section 4.3 of Appendix 2). The total mass flow rate of the diluted exhaust (G_TOTW) or the total mass of the diluted exhaust gas over the cycle (M_TOTW) shall be measured with a PDP or CFV (Annex V, Section 2.3.1). The accuracy shall be ± 2 % of reading or better, and shall be determined according to the provisions of Annex III, Appendix 5, Section 2.4.

3. DETERMINATION OF THE GASEOUS COMPONENTS U.K.

3.1. General analyser specifications U.K.

The analysers shall have a measuring range appropriate for the accuracy required to measure the concentrations of the exhaust gas components (Section 3.1.1). It is recommended that the analysers be operated such that the measured concentration falls between 15 % and 100 % of full scale. U.K.

If read-out systems (computers, data loggers) can provide sufficient accuracy and resolution below 15 % of full scale, measurements below 15 % of full scale are also acceptable. In this case, additional calibrations of at least four non-zero nominally equally spaced points are to be made to ensure the accuracy of the calibration curves according to Annex III, Appendix 5, Section 1.5.5.2.

The electromagnetic compatibility (EMC) of the equipment shall be on a level as to minimise additional errors.

3.1.1. Measurement error U.K.

The total measurement error, including the cross sensitivity to other gases (see Annex III, Appendix 5, Section 1.9), shall not exceed ± 5 % of the reading or ± 3,5 % of full scale, whichever is smaller. For concentrations of less than 100 ppm the measurement error shall not exceed ± 4 ppm.

3.1.2. Repeatability U.K.

The repeatability, defined as 2,5 times the standard deviation of 10 repetitive responses to a given calibration or span gas, has to be not greater than ± 1 % of full scale concentration for each range used above 155 ppm (or ppmC) or ± 2 % of each range used below 155 ppm (or ppmC).

3.1.3. Noise U.K.

The analyser peak-to-peak response to zero and calibration or span gases over any 10 second period shall not exceed 2 % of full scale on all ranges used.

3.1.4. Zero drift U.K.

The zero drift during a one hour period shall be less than 2 % of full scale on the lowest range used. The zero response is defined as the mean response, including noise, to a zero gas during a 30 seconds time interval.

3.1.5. Span drift U.K.

The span drift during a one hour period shall be less than 2 % of full scale on the lowest range used. Span is defined as the difference between the span response and the zero response. The span response is defined as the mean response, including noise, to a span gas during a 30 seconds time interval.

3.2. Gas drying U.K.

The optional gas drying device must have a minimal effect on the concentration of the measured gases. Chemical dryers are not an acceptable method of removing water from the sample.

3.3. Analysers U.K.

Sections 3.3.1 to 3.3.4 describe the measurement principles to be used. A detailed description of the measurement systems is given in Annex V. The gases to be measured shall be analysed with the following instruments. For non-linear analysers, the use of linearising circuits is permitted. U.K.

3.3.1. Carbon monoxide (CO) analysis U.K.

The carbon monoxide analyser shall be of the Non-Dispersive InfraRed (NDIR) absorption type.

3.3.2. Carbon dioxide (CO₂) analysis U.K.

The carbon dioxide analyser shall be of the Non-Dispersive InfraRed (NDIR) absorption type.

3.3.3. Hydrocarbon (HC) analysis U.K.

For diesel and LPG fuelled gas engines, the hydrocarbon analyser shall be of the Heated Flame Ionisation Detector (HFID) type with detector, valves, pipework, etc. heated so as to maintain a gas temperature of 463K ± 10K (190 ± 10 °C). For NG fuelled gas engines, the hydrocarbon analyser may be of the non-heated Flame Ionisation Detector (FID) type depending upon the method used (see Annex V, Section 1.3).

3.3.4. Non-methane hydrocarbon (NMHC) analysis (NG fuelled gas engines only) U.K.

Non-methane hydrocarbons shall be determined by either of the following methods: U.K.

3.3.4.1. Gas chromatographic (GC) method U.K.

Non-methane hydrocarbons shall be determined by subtraction of the methane analysed with a Gas Chromatograph (GC) conditioned at 423 K (150 °C) from the hydrocarbons measured according to Section 3.3.3.

3.3.4.2. Non-methane cutter (NMC) method U.K.

The determination of the non-methane fraction shall be performed with a heated NMC operated in line with an FID as per Section 3.3.3 by subtraction of the methane from the hydrocarbons.

3.3.5. Oxides of nitrogen (NO_x) analysis U.K.

The oxides of nitrogen analyser shall be of the ChemiLuminescent Detector (CLD) or Heated ChemiLuminescent Detector (HCLD) type with a NO₂/NO converter, if measured on a dry basis. If measured on a wet basis, a HCLD with converter maintained above 328 K (55 °C) shall be used, provided the water quench check (see Annex III, Appendix 5, Section 1.9.2.2) is satisfied.

3.4. Sampling of gaseous emissions U.K.

3.4.1. Raw exhaust gas (ESC only) U.K.

The gaseous emissions sampling probes must be fitted at least 0,5 m or 3 times the diameter of the exhaust pipe whichever is the larger-upstream of the exit of the exhaust gas system as far as applicable and sufficiently close to the engine as to ensure an exhaust gas temperature of at least 343 K (70 °C) at the probe.

In the case of a multi-cylinder engine with a branched exhaust manifold, the inlet of the probe shall be located sufficiently far downstream so as to ensure that the sample is representative of the average exhaust emissions from all cylinders. In multi-cylinder engines having distinct groups of manifolds, such as in a ‘Vee’ engine configuration, it is permissible to acquire a sample from each group individually and calculate an average exhaust emission. Other methods which have been shown to correlate with the above methods may be used. For exhaust emission calculation the total exhaust mass flow must be used.

If the engine is equipped with an exhaust aftertreatment system, the exhaust sample shall be taken downstream of the exhaust aftertreatment system.

3.4.2. Diluted exhaust gas (mandatory for ETC, optional for ESC) U.K.

The exhaust pipe between the engine and the full flow dilution system shall conform to the requirements of Annex V, Section 2.3.1, EP.

The gaseous emissions sample probe(s) shall be installed in the dilution tunnel at a point where the dilution air and exhaust gas are well mixed, and in close proximity to the particulates sampling probe.

For the ETC, sampling can generally be done in two ways:

• the pollutants are sampled into a sampling bag over the cycle and measured after completion of the test;

• the pollutants are sampled continuously and integrated over the cycle; this method is mandatory for HC and NO_x.

4. DETERMINATION OF THE PARTICULATES U.K.

The determination of the particulates requires a dilution system. Dilution may be accomplished by a partial flow dilution system (ESC only) or a full flow dilution system (mandatory for ETC). The flow capacity of the dilution system shall be large enough to completely eliminate water condensation in the dilution and sampling systems, and maintain the temperature of the diluted exhaust gas at or below 325K (52 °C) immediately upstream of the filter holders. Dehumidifying the dilution air before entering the dilution system is permitted, and especially useful if dilution air humidity is high. The temperature of the dilution air shall be 298 K ± 5 K (25 °C ± 5 °C). If the ambient temperature is below 293 K (20 °C), dilution air pre-heating above the upper temperature limit of 303K (30 °C) is recommended. However, the dilution air temperature must not exceed 325 K (52 °C) prior to the introduction of the exhaust in the dilution tunnel. U.K.

The partial flow dilution system has to be designed to split the exhaust stream into two fractions, the smaller one being diluted with air and subsequently used for particulate measurement. For this it is essential that the dilution ratio be determined very accurately. Different splitting methods can be applied, whereby the type of splitting used dictates to a significant degree the sampling hardware and procedures to be used (Annex V, Section 2.2). The particulate sampling probe shall be installed in close proximity to the gaseous emissions sampling probe, and the installation shall comply with the provisions of Section 3.4.1.

To determine the mass of the particulates, a particulate sampling system, particulate sampling filters, a microgram balance, and a temperature and humidity controlled weighing chamber, are required.

For particulate sampling, the single filter method shall be applied which uses one pair of filters (see Section 4.1.3) for the whole test cycle. For the ESC, considerable attention must be paid to sampling times and flows during the sampling phase of the test.

4.1. Particulate sampling filters U.K.

4.1.1. Filter specification U.K.

Fluorocarbon coated glass fibre filters or fluorocarbon based membrane filters are required. All filter types shall have a 0,3 μm DOP (di-octylphthalate) collection efficiency of at least 95 % at a gas face velocity between 35 and 80 cm/s.

4.1.2. Filter size U.K.

Particulate filters must have a minimum diameter of 47 mm (37 mm stain diameter). Larger diameter filters are acceptable (Section 4.1.5).

4.1.3. Primary and back-up filters U.K.

The diluted exhaust shall be sampled by a pair of filters placed in series (one primary and one back-up filter) during the test sequence. The back-up filter shall be located no more than 100 mm downstream of, and shall not be in contact with the primary filter. The filters may be weighed separately or as a pair with the filters placed stain side to stain side.

4.1.4. Filter face velocity U.K.

A gas face velocity through the filter of 35 to 80 cm/s shall be achieved. The pressure drop increase between the beginning and the end of the test shall be no more than 25 kPa.

4.1.5. Filter loading U.K.

The recommended minimum filter loading shall be 0,5 mg/1 075 mm² stain area. For the most common filter sizes the values are shown in Table 9.

Table 9
Recommended filter loadings
Filter diameter	Recommended stain	Recommended minimum loading
(mm)	(mm)	(mg)
47	37	0,5
70	60	1,3
90	80	2,3
110	100	3,6

4.2. Weighing chamber and analytical balance specifications U.K.

4.2.1. Weighing chamber conditions U.K.

The temperature of the chamber (or room) in which the particulate filters are conditioned and weighed shall be maintained to within 295 K ± 3 K (22 °C ± 3 °C) during all filter conditioning and weighing. The humidity shall be maintained to a dewpoint of 282,5 K ± 3 K (9,5 °C ± 3 °C) and a relative humidity of 45 % ± 8 %.

4.2.2. Reference filter weighing U.K.

The chamber (or room) environment shall be free of any ambient contaminants (such as dust) that would settle on the particulate filters during their stabilisation. Disturbances to weighing room specifications as outlined in Section 4.2.1 will be allowed if the duration of the disturbances does not exceed 30 minutes. The weighing room should meet the required specifications prior to personal entrance into the weighing room. At least two unused reference filters or reference filter pairs shall be weighed within 4 hours of, but preferably at the same time as the sample filter (pair) weighings. They shall be the same size and material as the sample filters.

If the average weight of the reference filters (reference filter pairs) changes between sample filter weighings by more than ± 5 % (± 7,5 % for the filter pair respectively) of the recommended minimum filter loading (Section 4.1.5), then all sample filters shall be discarded and the emissions test repeated.

If the weighing room stability criteria outlined in Section 4.2.1 is not met, but the reference filter (pair) weighings meet the above criteria, the engine manufacturer has the option of accepting the sample filter weights or voiding the tests, fixing the weighing room control system and rerunning the test.

4.2.3. Analytical balance U.K.

The analytical balance used to determine the weights of all filters shall have a precision (standard deviation) of 20 μg and a resolution of 10 μg (1 digit = 10 μg). For filters less than 70 mm diameter, the precision and resolution shall be 2 μg and 1 μg, respectively.

4.3. Additional specifications for particulate measurement U.K.

All parts of the dilution system and the sampling system from the exhaust pipe up to the filter holder, which are in contact with raw and diluted exhaust gas, must be designed to minimise deposition or alteration of the particulates. All parts must be made of electrically conductive materials that do not react with exhaust gas components, and must be electrically grounded to prevent electrostatic effects.

5. DETERMINATION OF SMOKE U.K.

This section provides specifications for the required and optional test equipment to be used for the ELR test. The smoke shall be measured with an opacimeter having an opacity and a light absorption coefficient readout mode. The opacity readout mode shall only be used for calibration and checking of the opacimeter. The smoke values of the test cycle shall be measured in the light absorption coefficient readout mode. U.K.

5.1. General requirements U.K.

The ELR requires the use of a smoke measurement and data processing system which includes three functional units. These units may be integrated into a single component or provided as a system of interconnected components. The three functional units are:

• an opacimeter meeting the specifications of Annex V, Section 3,

• a data processing unit capable of performing the functions described in Annex III, Appendix 1, Section 6,

• a printer and/or electronic storage medium to record and output the required smoke values specified in Annex III, Appendix 1, Section 6.3.

5.2. Specific requirements U.K.

5.2.1. Linearity U.K.

The linearity shall be within ± 2 % opacity.

5.2.2. Zero drift U.K.

The zero drift during a one hour period shall not exceed ± 1 % opacity.

5.2.3. Opacimeter display and range U.K.

For display in opacity, the range shall be 0-100 % opacity, and the readability 0,1 % opacity. For display in light absorption coefficient, the range shall be 0-30 m^-1 light absorption coefficient, and the readability 0,01 m^-1 light absorption coefficient.

5.2.4. Instrument response time U.K.

The physical response time of the opacimeter shall not exceed 0,2 s. The physical response time is the difference between the times when the output of a rapid response receiver reaches 10 and 90 % of the full deviation when the opacity of the gas being measured is changed in less than 0,1 s.

The electrical response time of the opacimeter shall not exceed 0,05 s. The electrical response time is the difference between the times when the opacimeter output reaches 10 and 90 % of the full scale when the light source is interrupted or completely extinguished in less than 0,01 s.

5.2.5. Neutral density filters U.K.

Any neutral density filter used in conjunction with opacimeter calibration, linearity measurements, or setting span shall have its value known to within 1,0 % opacity. The filter's nominal value must be checked for accuracy at least yearly using a reference traceable to a national or international standard.

Neutral density filters are precision devices and can easily be damaged during use. Handling should be minimised and, when required, should be done with care to avoid scratching or soiling of the filter.

Appendix 5 CALIBRATION PROCEDURE

1. CALIBRATION OF THE ANALYTICAL INSTRUMENTS U.K.

1.1. Introduction U.K.

Each analyser shall be calibrated as often as necessary to fulfil the accuracy requirements of this Directive. The calibration method that shall be used is described in this section for the analysers indicated in Annex III, Appendix 4, Section 3 and Annex V, Section 1.

1.2. Calibration gases U.K.

The shelf life of all calibration gases must be respected.

The expiration date of the calibration gases stated by the manufacturer shall be recorded.

1.2.1. Pure gases U.K.

The required purity of the gases is defined by the contamination limits given below. The following gases must be available for operation:

• Purified nitrogen

  (Contamination ≤ 1 ppm C1, ≤ 1 ppm CO, ≤ 400 ppm CO₂, ≤ 0,1 ppm NO)

• Purified oxygen

  (Purity > 99,5 % vol O₂)

• Hydrogen-helium mixture

  (40 ± 2 % hydrogen, balance helium)

  (Contamination ≤ 1 ppm C1, ≤ 400 ppm CO₂)

• Purified synthetic air

  (Contamination ≤ 1 ppm C1, ≤ 1 ppm CO, ≤ 400 ppm CO₂, ≤ 0,1 ppm NO)

  (Oxygen content between 18-21 % vol.)

• Purified propane or CO for the CVS verification

1.2.2. Calibration and span gases U.K.

Mixtures of gases having the following chemical compositions shall be available:

C₃H₈ and purified synthetic air (see Section 1.2.1);

CO and purified nitrogen;

NO_x and purified nitrogen (the amount of NO₂ contained in this calibration gas must not exceed 5 % of the NO content);

CO₂ and purified nitrogen;

CH₄ and purified synthetic air;

C₂H₆ and purified synthetic air.

Note: Other gas combinations are allowed provided the gases do not react with one another. U.K.

The true concentration of a calibration and span gas must be within ± 2 % of the nominal value. All concentrations of calibration gas shall be given on a volume basis (volume percent or volume ppm).

The gases used for calibration and span may also be obtained by means of a gas divider, diluting with purified N₂ or with purified synthetic air. The accuracy of the mixing device must be such that the concentration of the diluted calibration gases may be determined to within ± 2 %.

1.3. Operating procedure for analysers and sampling system U.K.

The operating procedure for analysers shall follow the start-up and operating instructions of the instrument manufacturer. The minimum requirements given in Sections 1.4 to 1.9 shall be included.

1.4. Leakage test U.K.

A system leakage test shall be performed. The probe shall be disconnected from the exhaust system and the end plugged. The analyser pump shall be switched on. After an initial stabilisation period all flow meters should read zero. If not, the sampling lines shall be checked and the fault corrected.

The maximum allowable leakage rate on the vacuum side shall be 0,5 % of the in-use flow rate for the portion of the system being checked. The analyser flows and bypass flows may be used to estimate the in-use flow rates.

Another method is the introduction of a concentration step change at the beginning of the sampling line by switching from zero to span gas. If after an adequate period of time the reading shows a lower concentration compared to the introduced concentration, this points to calibration or leakage problems.

1.5. Calibration procedure U.K.

1.5.1. Instrument assembly U.K.

The instrument assembly shall be calibrated and calibration curves checked against standard gases. The same gas flow rates shall be used as when sampling exhaust.

1.5.2. Warming-up time U.K.

The warming-up time should be according to the recommendations of the manufacturer. If not specified, a minimum of two hours is recommended for warming up the analysers.

1.5.3. NDIR and HFID analyser U.K.

The NDIR analyser shall be tuned, as necessary, and the combustion flame of the HFID analyser shall be optimised (Section 1.8.1).

1.5.4. Calibration U.K.

Each normally used operating range shall be calibrated.

Using purified synthetic air (or nitrogen), the CO, CO₂, NO_x and HC analysers shall be set at zero.

The appropriate calibration gases shall be introduced to the analysers, the values recorded, and the calibration curve established according to Section 1.5.5.

The zero setting shall be rechecked and the calibration procedure repeated, if necessary.

1.5.5. Establishment of the calibration curve U.K.

1.5.5.1. General guidelines U.K.

The analyser calibration curve shall be established by at least five calibration points (excluding zero) spaced as uniformly as possible. The highest nominal concentration must be equal to or higher than 90 % of full scale.

The calibration curve shall be calculated by the method of least squares. If the resulting polynomial degree is greater than 3, the number of calibration points (zero included) must be at least equal to this polynomial degree plus 2.

The calibration curve must not differ by more than ± 2 % from the nominal value of each calibration point and by more than ± 1 % of full scale at zero.

From the calibration curve and the calibration points, it is possible to verify that the calibration has been carried out correctly. The different characteristic parameters of the analyser must be indicated, particularly:

• the measuring range,

• the sensitivity,

• the date of carrying out the calibration.

1.5.5.2. Calibration below 15 % of full scale U.K.

The analyser calibration curve shall be established by at least 4 additional calibration points (excluding zero) spaced nominally equally below 15 % of full scale.

The calibration curve is calculated by the method of least squares.

The calibration curve must not differ by more than ± 4 % from the nominal value of each calibration point and by more than ± 1 % of full scale at zero.

1.5.5.3. Alternative methods U.K.

If it can be shown that alternative technology (e.g. computer, electronically controlled range switch, etc.) can give equivalent accuracy, then these alternatives may be used.

1.6. Verification of the calibration U.K.

Each normally used operating range shall be checked prior to each analysis in accordance with the following procedure.

The calibration shall be checked by using a zero gas and a span gas whose nominal value is more than 80 % of full scale of the measuring range.

If, for the two points considered, the value found does not differ by more than ± 4 % of full scale from the declared reference value, the adjustment parameters may be modified. Should this not be the case, a new calibration curve shall be established in accordance with Section 1.5.5.

1.7. Efficiency test of the NO_x converter U.K.

The efficiency of the converter used for the conversion of NO₂ into NO shall be tested as given in Sections 1.7.1 to 1.7.8 (Figure 6).

1.7.1. Test set-up U.K.

Using the test set-up as shown in Figure 6 (see also Annex III, Appendix 4, Section 3.3.5) and the procedure below, the efficiency of converters can be tested by means of an ozonator.

1.7.2. Calibration U.K.

The CLD and the HCLD shall be calibrated in the most common operating range following the manufacturer's specifications using zero and span gas (the NO content of which must amount to about 80 % of the operating range and the NO₂ concentration of the gas mixture to less than 5 % of the NO concentration). The NO_x analyser must be in the NO mode so that the span gas does not pass through the converter. The indicated concentration has to be recorded.

1.7.3. Calculation U.K.

The efficiency of the NO_x converter is calculated as follows:

where,

a

=

is the NO_x concentration according to Section 1.7.6

b

=

is the NO_x concentration according to Section 1.7.7

c

=

is the NO concentration according to Section 1.7.4

d

=

is the NO concentration according to Section 1.7.5

1.7.4. Adding of oxygen U.K.

Via a T-fitting, oxygen or zero air is added continuously to the gas flow until the concentration indicated is about 20 % less than the indicated calibration concentration given in Section 1.7.2. (The analyser is in the NO mode). The indicated concentration c shall be recorded. The ozonator is kept deactivated throughout the process.

1.7.5. Activation of the ozonator U.K.

The ozonator is now activated to generate enough ozone to bring the NO concentration down to about 20 % (minimum 10 %) of the calibration concentration given in Section 1.7.2. The indicated concentration d shall be recorded. (The analyser is in the NO mode).

1.7.6. NO_x mode U.K.

The NO analyser is then switched to the NO_x mode so that the gas mixture (consisting of NO, NO₂, O₂ and N₂) now passes through the converter. The indicated concentration a shall be recorded. (The analyser is in the NO_x mode).

1.7.7. Deactivation of the ozonator U.K.

The ozonator is now deactivated. The mixture of gases described in Section 1.7.6 passes through the converter into the detector. The indicated concentration b shall be recorded. (The analyser is in the NO_x mode).

1.7.8. NO mode U.K.

Switched to NO mode with the ozonator deactivated, the flow of oxygen or synthetic air is also shut off. The NO_x reading of the analyser shall not deviate by more than ± 5 % from the value measured according to Section 1.7.2. (The analyser is in the NO mode).

1.7.9. Test interval U.K.

The efficiency of the converter must be tested prior to each calibration of the NO_x analyser.

1.7.10. Efficiency requirement U.K.

The efficiency of the converter shall not be less than 90 %, but a higher efficiency of 95 % is strongly recommended.

Note: If, with the analyser in the most common range, the ozonator cannot give a reduction from 80 % to 20 % according to Section 1.7.5, then the highest range which will give the reduction shall be used. U.K.

1.8. Adjustment of the FID U.K.

1.8.1. Optimisation of the detector response U.K.

The FID must be adjusted as specified by the instrument manufacturer. A propane in air span gas should be used to optimise the response on the most common operating range.

With the fuel and air flow rates set at the manufacturer's recommendations, a 350 ± 75 ppm C span gas shall be introduced to the analyser. The response at a given fuel flow shall be determined from the difference between the span gas response and the zero gas response. The fuel flow shall be incrementally adjusted above and below the manufacturer's specification. The span and zero response at these fuel flows shall be recorded. The difference between the span and zero response shall be plotted and the fuel flow adjusted to the rich side of the curve.

1.8.2. Hydrocarbon response factors U.K.

The analyser shall be calibrated using propane in air and purified synthetic air, according to Section 1.5.

Response factors shall be determined when introducing an analyser into service and after major service intervals. The response factor (R_f) for a particular hydrocarbon species is the ratio of the FID C1 reading to the gas concentration in the cylinder expressed by ppm C1.

The concentration of the test gas must be at a level to give a response of approximately 80 % of full scale. The concentration must be known to an accuracy of ± 2 % in reference to a gravimetric standard expressed in volume. In addition, the gas cylinder must be preconditioned for 24 hours at a temperature of 298 K ± 5 K (25 °C ± 5 °C).

The test gases to be used and the recommended relative response factor ranges are as follows:

methane and purified synthetic air 1,00 ≤ R_f ≤ 1,15

propylene and purified synthetic air 0,90 ≤ R_f ≤ 1,10

toluene and purified synthetic air 0,90 ≤ R_f ≤ 1,10

These values are relative to the response factor (R_f) of 1,00 for propane and purified synthetic air.

1.8.3. Oxygen interference check U.K.

The oxygen interference check shall be determined when introducing an analyser into service and after major service intervals.

The response factor is defined and shall be determined as described in Section 1.8.2. The test gas to be used and the recommended relative response factor range are as follows:

This value is relative to the response factor (R_f) of 1,00 for propane and purified synthetic air.

The FID burner air oxygen concentration must be within ± 1 mole % of the oxygen concentration of the burner air used in the latest oxygen interference check. If the difference is greater, the oxygen interference must be checked and the analyser adjusted, if necessary.

1.8.4. Efficiency of the non-methane cutter (NMC, for NG fuelled gas engines only) U.K.

The NMC is used for the removal of the non-methane hydrocarbons from the sample gas by oxidising all hydrocarbons except methane. Ideally, the conversion for methane is 0 %, and for the other hydrocarbons represented by ethane is 100 %. For the accurate measurement of NMHC, the two efficiencies shall be determined and used for the calculation of the NMHC emission mass flow rate (see Annex III, Appendix 2, Section 4.3).

1.8.4.1. Methane efficiency U.K.

Methane calibration gas shall be flown through the FID with and without bypassing the NMC and the two concentrations recorded. The efficiency shall be determined as follows:

where,

conc_w

=

HC concentration with CH₄ flowing through the NMC

conc_w/o

=

HC concentration with CH₄ bypassing the NMC

1.8.4.2. Ethane efficiency U.K.

Ethane calibration gas shall be flown through the FID with and without bypassing the NMC and the two concentrations recorded. The efficiency shall be determined as follows

where,

conc_w

=

HC concentration with C₂H₆ flowing through the NMC

conc_w/o

=

HC concentration with C₂H₆ bypassing the NMC

1.9. Interference effects with CO, CO₂, and NO_x analysers U.K.

Gases present in the exhaust other than the one being analysed can interfere with the reading in several ways. Positive interference occurs in NDIR instruments where the interfering gas gives the same effect as the gas being measured, but to a lesser degree. Negative interference occurs in NDIR instruments by the interfering gas broadening the absorption band of the measured gas, and in CLD instruments by the interfering gas quenching the radiation. The interference checks in Sections 1.9.1 and 1.9.2 shall be performed prior to an analyser's initial use and after major service intervals.

1.9.1. CO analyser interference check U.K.

Water and CO₂ can interfere with the CO analyser performance. Therefore, a CO₂ span gas having a concentration of 80 to 100 % of full scale of the maximum operating range used during testing shall be bubbled through water at room temperature and the analyser response recorded. The analyser response must not be more than 1 % of full scale for ranges equal to or above 300 ppm or more than 3 ppm for ranges below 300 ppm.

1.9.2. NO_x analyser quench checks U.K.

The two gases of concern for CLD (and HCLD) analysers are CO₂ and water vapour. Quench responses to these gases are proportional to their concentrations, and therefore require test techniques to determine the quench at the highest expected concentrations experienced during testing.

1.9.2.1. CO₂ quench check U.K.

A CO₂ span gas having a concentration of 80 to 100 % of full scale of the maximum operating range shall be passed through the NDIR analyser and the CO₂ value recorded as A. It shall then be diluted approximately 50 % with NO span gas and passed through the NDIR and (H)CLD, with the CO₂ and NO values recorded as B and C, respectively. The CO₂ shall then be shut off and only the NO span gas be passed through the (H)CLD and the NO value recorded as D.

The quench, which must not be greater than 3 % of full scale, shall be calculated as follows:

where,

A

=

is the undiluted CO₂ concentration measured with NDIR in %

B

=

is the diluted CO₂ concentration measured with NDIR in %

C

=

is the diluted NO concentration measured with (H)CLD in ppm

D

=

is the undiluted NO concentration measured with (H)CLD in ppm

Alternative methods of diluting and quantifying of CO₂ and NO span gas values such as dynamic mixing/blending can be used.

1.9.2.2. Water quench check U.K.

This check applies to wet gas concentration measurements only. Calculation of water quench must consider dilution of the NO span gas with water vapour and scaling of water vapour concentration of the mixture to that expected during testing.

A NO span gas having a concentration of 80 to 100 % of full scale of the normal operating range shall be passed through the (H)CLD and the NO value recorded as D. The NO span gas shall then be bubbled through water at room temperature and passed through the (H)CLD and the NO value recorded as C. The analyser's absolute operating pressure and the water temperature shall be determined and recorded as E and F, respectively. The mixture's saturation vapour pressure that corresponds to the bubbler water temperature F shall be determined and recorded as G. The water vapour concentration (H, in %) of the mixture shall be calculated as follows:

The expected diluted NO span gas (in water vapour) concentration (D_e) shall be calculated as follows:

For diesel exhaust, the maximum exhaust water vapour concentration (H_m, in %) expected during testing shall be estimated, under the assumption of a fuel atom H/C ratio of 1,8:1, from the undiluted CO₂ span gas concentration (A, as measured in Section 1.9.2.1) as follows:

The water quench, which must not be greater than 3 %, shall be calculated as follows:

where,

D_e

=

is the expected diluted NO concentration in ppm

C

=

is the diluted NO concentration in ppm

H_m

=

is the maximum water vapour concentration in %

H

=

is the actual water vapour concentration in %

Note: It is important that the NO span gas contains minimal NO₂ concentration for this check, since absorption of NO₂ in water has not been accounted for in the quench calculations. U.K.

1.10. Calibration intervals U.K.

The analysers shall be calibrated according to Section 1.5 at least every three months or whenever a system repair or change is made that could influence calibration.

2. CALIBRATION OF THE CVS-SYSTEM U.K.

2.1. General U.K.

The CVS system shall be calibrated by using an accurate flowmeter traceable to national or international standards and a restricting device. The flow through the system shall be measured at different restriction settings, and the control parameters of the system shall be measured and related to the flow.

Various types of flowmeters may be used, e.g. calibrated venturi, calibrated laminar flowmeter, calibrated turbinemeter.

2.2. Calibration of the Positive Displacement Pump (PDP) U.K.

All parameters related to the pump shall be simultaneously measured with the parameters related to the flowmeter which is connected in series with the pump. The calculated flow rate (in m³/min at pump inlet, absolute pressure and temperature) shall be plotted versus a correlation function which is the value of a specific combination of pump parameters. The linear equation which relates the pump flow and the correlation function shall then be determined. If a CVS has a multiple speed drive, the calibration shall be performed for each range used. Temperature stability shall be maintained during calibration.

2.2.1. Data analysis U.K.

The air flowrate (Q_s) at each restriction setting (minimum six settings) shall be calculated in standard m³/min from the flowmeter data using the manufacturer's prescribed method. The air flow rate shall then be converted to pump flow (V₀) in m³/rev at absolute pump inlet temperature and pressure as follows:

where,

Q_s

=

air flow rate at standard conditions (101,3 kPa, 273 K), m³/s

T

=

temperature at pump inlet, K

p_A

=

absolute pressure at pump inlet (p_B-p₁), kPa

n

=

pump speed, rev/s

To account for the interaction of pressure variations at the pump and the pump slip rate, the correlation function (X₀) between pump speed, pressure differential from pump inlet to pump outlet and absolute pump outlet pressure shall be calculated as follows:

where,

Δp_p

=

pressure differential from pump inlet to pump outlet, kPa

p_A

=

absolute outlet pressure at pump outlet, kPa

A linear least-square fit shall be performed to generate the calibration equation as follows:

D₀ and m are the intercept and slope constants, respectively, describing the regression lines.

For a CVS system with multiple speeds, the calibration curves generated for the different pump flow ranges shall be approximately parallel, and the intercept values (D₀) shall increase as the pump flow range decreases.

The calculated values from the equation shall be within ± 0,5 % of the measured value of V₀. Values of m will vary from one pump to another. Particulate influx over time will cause the pump slip to decrease, as reflected by lower values for m. Therefore, calibration shall be performed at pump start-up, after major maintenance, and if the total system verification (Section 2.4) indicates a change of the slip rate.

2.3. Calibration of the Critical Flow Venturi (CFV) U.K.

Calibration of the CFV is based upon the flow equation for a critical venturi. Gas flow is a function of inlet pressure and temperature, as shown below:

where,

K_v

=

calibration coefficient

p_A

=

absolute pressure at venturi inlet, kPa

T

=

temperature at venturi inlet, K

2.3.1. Data analysis U.K.

The air flowrate (Q_s) at each restriction setting (minimum eight settings) shall be calculated in standard m³/min from the flowmeter data using the manufacturer's prescribed method. The calibration coefficient shall be calculated from the calibration data for each setting as follows:

where,

Q_s

=

air flow rate at standard conditions (101,3 kPa, 273 K), m³/s

T

=

temperature at the venturi inlet, K

p_A

=

absolute pressure at venturi inlet, kPa

To determine the range of critical flow, K_v shall be plotted as a function of venturi inlet pressure. For critical (choked) flow, K_v will have a relatively constant value. As pressure decreases (vacuum increases), the venturi becomes unchoked and K_v decreases, which indicates that the CFV is operated outside the permissible range.

For a minimum of eight points in the region of critical flow, the average K_v and the standard deviation shall be calculated. The standard deviation shall not exceed ± 0,3 % of the average K_V.

2.4. Total system verification U.K.

The total accuracy of the CVS sampling system and analytical system shall be determined by introducing a known mass of a pollutant gas into the system while it is being operated in the normal manner. The pollutant is analysed, and the mass calculated according to Annex III, Appendix 2, Section 4.3 except in the case of propane where a factor of 0,000472 is used in place of 0,000479 for HC. Either of the following two techniques shall be used.

2.4.1. Metering with a critical flow orifice U.K.

A known quantity of pure gas (carbon monoxide or propane) shall be fed into the CVS system through a calibrated critical orifice. If the inlet pressure is high enough, the flow rate, which is adjusted by means of the critical flow orifice, is independent of the orifice outlet pressure (≡ critical flow). The CVS system shall be operated as in a normal exhaust emission test for about 5 to 10 minutes. A gas sample shall be analysed with the usual equipment (sampling bag or integrating method), and the mass of the gas calculated. The mass so determined shall be within ± 3 % of the known mass of the gas injected.

2.4.2. Metering by means of a gravimetric technique U.K.

The weight of a small cylinder filled with carbon monoxide or propane shall be determined with a precision of ± 0,01 gram. For about 5 to 10 minutes, the CVS system shall be operated as in a normal exhaust emission test, while carbon monoxide or propane is injected into the system. The quantity of pure gas discharged shall be determined by means of differential weighing. A gas sample shall be analysed with the usual equipment (sampling bag or integrating method), and the mass of the gas calculated. The mass so determined shall be within ± 3 % of the known mass of the gas injected.

3. CALIBRATION OF THE PARTICULATE MEASURING SYSTEM U.K.

3.1. Introduction U.K.

Each component shall be calibrated as often as necessary to fulfil the accuracy requirements of this Directive. The calibration method to be used is described in this section for the components indicated in Annex III, Appendix 4, Section 4 and Annex V, Section 2.

3.2. Flow measurement U.K.

The calibration of gas flow meters or flow measurement instrumentation shall be traceable to international and/or national standards. The maximum error of the measured value shall be within ± 2 % of reading.

If the gas flow is determined by differential flow measurement, the maximum error of the difference shall be such that the accuracy of G_EDF is within ± 4 % (see also Annex V, Section 2.2.1, EGA). It can be calculated by taking the Root-Mean-Square of the errors of each instrument.

3.3. Checking the partial flow conditions U.K.

The range of the exhaust gas velocity and the pressure oscillations shall be checked and adjusted according to the requirements of Annex V, Section 2.2.1, EP, if applicable.

3.4. Calibration intervals U.K.

The flow measurement instrumentation shall be calibrated at least every three months or whenever a system repair or change is made that could influence calibration.

4. CALIBRATION OF THE SMOKE MEASUREMENT EQUIPMENT U.K.

4.1. Introduction U.K.

The opacimeter shall be calibrated as often as necessary to fulfil the accuracy requirements of this Directive. The calibration method to be used is described in this section for the components indicated in Annex III, Appendix 4, Section 5 and Annex V, Section 3.

4.2. Calibration procedure U.K.

4.2.1. Warming-up time U.K.

The opacimeter shall be warmed up and stabilised according to the manufacturer's recommendations. If the opacimeter is equipped with a purge air system to prevent sooting of the instrument optics, this system should also be activated and adjusted according to the manufacturer's recommendations.

4.2.2. Establishment of the linearity response U.K.

The linearity of the opacimeter shall be checked in the opacity readout mode as per the manufacturer's recommendations. Three neutral density filters of known transmittance, which shall meet the requirements of Annex III, Appendix 4, Section 5.2.5, shall be introduced to the opacimeter and the value recorded. The neutral density filters shall have nominal opacities of approximately 10 %, 20 % and 40 %.

The linearity must not differ by more than ± 2 % opacity from the nominal value of the neutral density filter. Any non-linearity exceeding the above value must be corrected prior to the test.

4.3. Calibration intervals U.K.

The opacimeter shall be calibrated according to Section 4.2.2 at least every three months or whenever a system repair or change is made that could influence calibration.

(1)

The test points shall be selected using approved statistical methods of randomisation.

(2)

The test points shall be selected using approved statistical methods of randomisation.

(3)

The test points shall be selected using approved statistical methods of randomisation.

(4)

Based on C1 equivalent.

(5)

The value is only valid for the reference fuel specified in Annex IV.

(6)

Based on C1 equivalent.