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 CO2 tracer method for determining exhaust gas flows.

Original languageEnglish
Title of host publication2004 SAE World Congress
PublisherSAE International
ISBN (Print)0768013194, 9780768013191
Publication statusPublished - 1 Jan 2004
Event2004 SAE World Congress - Detroit, MI, USA United States
Duration: 8 Mar 200411 Mar 2004

Publication series

NameSAE World Congress & Exhibition
PublisherSAE International
ISSN (Print)0148-7191
ISSN (Electronic)2688-3627


Conference2004 SAE World Congress
Country/TerritoryUSA United States
CityDetroit, MI

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering


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