The measurement of vehicle modal emissions is technically challenging due to the major issue of determining exhaust gas mass flow rate and ensuring that it is synchronous with the emission measurement of that corresponding "slug” of exhaust gas. This is very evident when attempting to measure small passive NOx catalyst conversion efficiencies. This paper highlights alignment issues with regard to the variation of time delays associated with engine and vehicle events and the CO\d2 tracer method for determining exhaust gas flows.
|Publication status||Published - 8 Mar 2004|
|Event||SAE 2004 World Congress and Exhibition - Detroit, MI, USA United States|
Duration: 8 Mar 2004 → 11 Mar 2004
|Conference||SAE 2004 World Congress and Exhibition|
|Country||USA United States|
|Period||8/03/04 → 11/03/04|