Directive 2005/55/EC of the European Parliament and of the Council of 28 September 2005 on the approximation of the laws of the Member States relating to the measures to be taken against the emission of gaseous and particulate pollutants from compression-ignition engines for use in vehicles, and the emission of gaseous pollutants from positive-ignition engines fuelled with natural gas or liquefied petroleum gas for use in vehicles (Text with EEA relevance) (repealed) (c. 55)

ANNEX VII EXAMPLE OF CALCULATION PROCEDURE

3. ETC TEST

3.1. Gaseous emissions (diesel engine)

Assume the following test results for a PDP-CVS system

V0 (m3/rev)	0,1776
Np (rev)	23 073
pB (kPa)	98,0
p1 (kPa)	2,3
T (K)	322,5
Ha (g/kg)	12,8
NOx conce (ppm)	53,7
NOx concd (ppm)	0,4
COconce (ppm)	38,9
COconcd (ppm)	1,0
HCconce (ppm)	9,0
HCconcd (ppm)	3,02
CO2,conce (%)	0,723
Wact (kWh)	62,72

Calculation of the diluted exhaust gas flow (Annex III, Appendix 2, Section 4.1):

Calculation of the NO_x correction factor (Annex III, Appendix 2, Section 4.2):

Calculation of the background corrected concentrations (Annex III, Appendix 2, Section 4.3.1.1):

Assuming a diesel fuel of the composition C₁H_1,8

Calculation of the emissions mass flow (Annex III, Appendix 2, Section 4.3.1):

Calculation of the specific emissions (Annex III, Appendix 2, Section 4.4):

3.2. Particulate emissions (diesel engine)

Assume the following test results for a PDP-CVS system with double dilution

MTOTW (kg)	4 237,2
Mf,p (mg)	3,03
Mf,b (mg)	0,044
MTOT (kg)	2,159
MSEC (kg)	0,909
Md (mg)	0,341
MDIL (kg)	1,245
DF	18,69
Wact (kWh)	62,72

Calculation of the mass emission (Annex III, Appendix 2, Section 5.1):

Calculation of the background corrected mass emission (Annex III, Appendix 2, Section 5.1):

Calculation of the specific emission (Annex III, Appendix 2, Section 5.2):

3.3. Gaseous emissions (CNG engine)

Assume the following test results for a PDP-CVS system with double dilution

MTOTW (kg)	4 237,2
Ha (g/kg)	12,8
NOx conce (ppm)	17,2
NOx concd (ppm)	0,4
COconce (ppm)	44,3
COconcd (ppm)	1,0
HCconce (ppm)	27,0
HCconcd (ppm)	3,02
CH4 conce (ppm)	18,0
CH4 concd (ppm)	1,7
CO2,conce ( %)	0,723
Wact (kWh)	62,72

Calculation of the NO_x, correction factor (Annex III, Appendix 2, Section 4.2):

Calculation of the NMHC concentration (Annex III, Appendix 2, Section 4.3.1):

(a)

GC method

(b)

NMC method

Assuming a methane efficiency of 0,04 and an ethane efficiency of 0,98 (see Annex III, Appendix 5, Section 1.8.4)

Calculation of the background corrected concentrations (Annex III, Appendix 2, Section 4.3.1.1):

Assuming a G₂₀ reference fuel (100 % methane) of the composition C₁H₄:

For NMHC, the background concentration is the difference between HC_concd and CH_4concd

Calculation of the emissions mass flow (Annex III, Appendix 2, Section 4.3.1):

Calculation of the specific emissions (Annex III, Appendix 2, Section 4.4):