Council Directive of 20 March 1970 on the approximation of the laws of the Member States on measures to be taken against air pollution by emissions from motor vehicles (70/220/EEC) (repealed) (c. 220)

[F1 ANNEX III U.K. TYPE I TEST (Verifying the average emission of tailpipe emissions after a cold start)

Textual Amendments

F1 Substituted by Council Directive of 26 June 1991 amending Directive 70/220/EEC on the approximation of the laws of the Member States relating to measures to be taken against air pollution by emissions from motor vehicles (91/441/EEC).

Appendix 8 CALCULATION OF THE EMISSION OF POLLUTANTS

1. GENERAL U.K.

1.2. Volume determination U.K.

1.2.1. Calculation of the volume when a variable dilution device with constant flow control by orifice or venturi is used. Record continuously the parameters showing the volumetric flow, and calculate the total volume for the duration of the test. U.K.

1.2.2. Calculation of volume when a positive displacement pump is used. The volume of diluted exhaust gas in systems comprising a positive displacement pump is calculated with the following formula: U.K.

where:

V

=

volume of the diluted exhaust gas expressed in litres per test (prior to correction),

V _o

=

volume of gas delivered by the positive displacement pump on testing conditions in litres per revolution,

N

=

number of revolutions per test.

1.2.3. Correction of the diluted exhaust-gas volume to standard conditions. The diluted exhaust-gas volume is corrected by means of the following formula: U.K.

( ² )

in which:

( ³ )

where:

P _B

=

barometric pressure in the test room in kPa,

P ₁

=

vacuum at the inlet to the positive displacement pump in kPa relative to the ambient barometric pressure,

T _p

=

average temperature of the diluted exhaust gas entering the positive displacement pump during the test (K).]