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General Motors Phase II Catalyst System
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English
Abstract
Three-way catalysts provide a means of catalytically achieving lower NOx emission levels while maintaining good control of HC and CO emissions. However, very accurate control of air-fuel ratio is necessary. The precise air-fuel ratio control required is accomplished by employing a closed loop fuel metering system in conjunction with an exhaust gas sensor and an electronic control unit.
To gain production experience with this type of system, General Motors is introducing it on two 1978 engine families sold in California. One is a 2.5 litre L-4 engine and the other is a 3.8 litre V-6 engine. Closed loop controlled carburetors are used on both systems.
This paper discusses these 1978 systems. The components used on both systems are described and emission and fuel economy results are reviewed.
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Citation
Canale, R., Winegarden, S., Carlson, C., and Miles, D., "General Motors Phase II Catalyst System," SAE Technical Paper 780205, 1978, https://doi.org/10.4271/780205.Also In
References
- Engh Wallman “Development of the Volvo Lambda - Sond System” SAE Paper 770295 SAE Annual Meeting February 1977
- Rittmannsberger “Bosch Electronic Fuel Injection with Closed Loop Control” SAE Paper 750368 SAE Annual Meeting February 1975
- Camp Rachel “Closed Loop Air and Fuel Control” SAE Paper 750309 SAE Annual Meeting February 1975
- Spilski Creps “Closed Loop Carburetor Emission Control System” SAE Paper 750371 SAE Annual Meeting February 1975
- Klimisch Komarmy “The Catalytic Chemistry of Nitrogen Oxides” Klimisch Larson Plenum Press New York 1975
- Fleming Howarth Eddy “Sensor for On-Vehicle Detection of Exhaust Gas Composition” SAE Paper 730575
- Tanaka Durbin “Transient Response of a Carburetor Engine” SAE Paper 770046 SAE Annual Meeting 1977