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


Reference:

Hawley, J. G., Cox, A., Brace, C. J., Ketcher, D. and Stark, R., 2003. Influence of time-alignment on the calculation of mass emissions on a chassis rolls dynamometer. In: SAE World Congress & Exhibition, 2008-04-01, Detroit, MI.

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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.

Details

Item Type Conference or Workshop Items (Paper)
CreatorsHawley, J. G., Cox, A., Brace, C. J., Ketcher, D. and Stark, R.
DepartmentsFaculty of Engineering & Design > Mechanical Engineering
Faculty of Engineering & Design
RefereedNo
StatusPublished
ID Code2505

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