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Influence of Time-Alignment on the Calculation of Mass Emissions on a Chassis Rolls Dynamometer
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 03, 2003 by SAE International in United States
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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 ± 2 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.
- D. Ketcher - Diesel Engineering, Ford Motor Company Limited
- R. Stark - Diesel Engineering, Ford Motor Company Limited
- J. G. Hawley - Department of Mechanical Engineering, University of Bath
- C. J. Brace - Department of Mechanical Engineering, University of Bath
- A. Cox - Department of Mechanical Engineering, University of Bath
CitationHawley, J., Brace, C., Cox, A., Ketcher, D. et al., "Influence of Time-Alignment on the Calculation of Mass Emissions on a Chassis Rolls Dynamometer," SAE Technical Paper 2003-01-0395, 2003, https://doi.org/10.4271/2003-01-0395.
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