Observations Concerning Current Motor Vehicle Emissions

950812

02/01/1995

Event
International Congress & Exposition
Authors Abstract
Content
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.
Meta TagsDetails
DOI
https://doi.org/10.4271/950812
Pages
13
Citation
German, J., "Observations Concerning Current Motor Vehicle Emissions," SAE Technical Paper 950812, 1995, https://doi.org/10.4271/950812.
Additional Details
Publisher
Published
Feb 1, 1995
Product Code
950812
Content Type
Technical Paper
Language
English