Effectiveness of Engine Calibration Techniques to Reduce Off-Cycle Emissions

Paper #:
  • 971602

Published:
  • 1997-05-01
Citation:
Kwan, S., Parker, D., and Nolan, K., "Effectiveness of Engine Calibration Techniques to Reduce Off-Cycle Emissions," SAE Technical Paper 971602, 1997, https://doi.org/10.4271/971602.
Pages:
11
Abstract:
Engine calibrations are inexpensive methods for reducing exhaust emissions since only software modifications are required. The California Air Resources Board staff conducted a test program to investigate the effectiveness of engine calibration techniques to reduce the newly regulated aggressive driving exhaust emissions or “off-cycle” emissions. Consisting of stoichiometric and rich “bias” calibration, these engine calibration techniques were applied to fourteen late-model vehicles. The engine calibration techniques reduced the off-cycle emissions substantially on most vehicles. To comply with the proposed off-cycle standards for California low-emission vehicles and ultra-low-emission vehicles, these techniques will be a cost-effective method to reduce off-cycle emissions.
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