Influence of time-alignment on the calculation of mass emissions on a chassis rolls dynamometer

J G Hawley, A Cox, C J Brace, D Ketcher, R Stark

Research output: Contribution to conferencePaper

8 Citations (Scopus)

Abstract

Time-alignment sensitivity studies have been carried out to assess the accuracy of instantaneous mass NOx emissions on a chassis rolls dynamometer. The work is part of a larger project aimed at measuring passive NOx catalyst conversion efficiencies. Instantaneous NOx emissions are examined in relation to the NEDC vehicle speed trace at multi-sampling points, and phase and time alignment issues are highlighted and discussed. It has been found that a small mismatch of the vehicle speed trace to the instantaneous mass of emissions of \mP2 seconds can lead to results indicating that the conversion efficiency is anywhere between 0-20%. Finally, examples are presented showing the difficulties of attempting to adjust the time alignment of raw emissions data.
Original languageEnglish
Publication statusPublished - Mar 2003
EventSAE World Congress & Exhibition - Detroit, MI, USA United States
Duration: 1 Apr 2008 → …

Conference

ConferenceSAE World Congress & Exhibition
CountryUSA United States
CityDetroit, MI
Period1/04/08 → …

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    Hawley, J. G., Cox, A., Brace, C. J., Ketcher, D., & Stark, R. (2003). Influence of time-alignment on the calculation of mass emissions on a chassis rolls dynamometer. Paper presented at SAE World Congress & Exhibition, Detroit, MI, USA United States.