2.3. Exhaust gas flow

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) · European Union

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: direct measurement of the exhaust flow by flow nozzle or equivalent metering system; measurement of the air flow and the fuel flow by suitable metering systems and calculation of the exhaust flow by the following equation: GEXHW = GAIRW + GFUEL (for wet exhaust mass) The accuracy of exhaust flow determination shall be ± 2,5 % of reading or better.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-01 · Text as adopted (Official Journal); later amendments are not incorporated in this text.