Observations Concerning Current Motor Vehicle Emissions

Paper #:
  • 950812

Published:
  • 1995-02-01
Citation:
German, J., "Observations Concerning Current Motor Vehicle Emissions," SAE Technical Paper 950812, 1995, https://doi.org/10.4271/950812.
Pages:
13
Abstract:
A large database of second-by-second emissions and engine operating parameters has been gathered on 1992-1994 model year vehicles as part of the FTP Revision Study. The results provide insight about the impact various engine operating parameters have on engine-out emissions and catalyst conversion efficiency of modern, fuel-injected vehicles. The discussion consists primarily of observations made directly from the data, along with some background information to facilitate understanding by people without detailed technical backgrounds.Air/fuel ratio was the dominant influence on engine-out CO and NOx emissions, as well as HC and CO catalyst conversion efficiency. Brake specific engine-out HC emissions were influenced primarily by the block temperature and by deceleration. NOx catalyst conversion efficiency was influenced both by the air/fuel ratio and by micro-transient fuel control.
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