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Influence of Time-Alignment on the Calculation of Mass Emissions on a Chassis Rolls Dynamometer
Technical Paper
2003-01-0395
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
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 ± 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.
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Authors
- 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
- D. Ketcher - Diesel Engineering, Ford Motor Company Limited
- R. Stark - Diesel Engineering, Ford Motor Company Limited
Citation
Hawley, 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.Also In
References
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- Horiba MEXA-1300FRI Fast Response Motor Exhaust Gas Analyser Brochure
- Modal Delay Setting Procedure Elliot G Moore D Internal Ford (Dunton) Document May 2002