This paper describes the results of studies on the behavior of air-fuel ratios under feedback control, the effect of air-fuel ratio modulation on three-way catalyst conversion efficiency and emission test results with and without feed back control. As a further measure for decreasing automobile exhaust emissions, the three-way catalyst activity for reduction of CO, HC and NOx emissions is most effectively utilized when the normal engine air-fuel ratio perturbations are controlled and limited. In order to attain such an objective, this report describes the governing characteristics of an air-fuel ratio control system using an EFl engine coupled to a ZrO2 type O2 sensor and feed back loop. The conversion efficiency characteristics of a conventional three-way catalyst, using systematically modulated air-fuel ratios, and the resultant reduction of exhaust emissions with these systematic fluctuations and limited perturbations are also defined.
CATALYST SYSTEMS DEVELOPMENT
Sae Technical Papers
1977 International Automotive Engineering Congress and Exposition ; 1977
1977-02-01
Aufsatz (Konferenz)
Englisch
NOx Reduction Catalyst Development
Kraftfahrwesen | 1975
|Development of Close-Coupled Catalyst Systems for European Driving Conditions
SAE Technical Papers | 1998
|NOx Reduction Catalyst Development
SAE Technical Papers | 1975
|Development of Close-Coupled Catalyst Systems for European Driving Conditions
British Library Conference Proceedings | 1998
|NOx reduction catalyst development.
Kraftfahrwesen | 1975
|