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.
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. Download Citation
Author(s):
Raymond P. Canale, Samuel R. Winegarden, Clifford R. Carlson, Donald L. Miles
Affiliated:
General Motors Corporation
Pages: 10
Event:
1978 Automotive Engineering Congress and Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
SAE 1978 Transactions-V87-A
Related Topics:
Air / fuel ratio
Three-way catalysts
Electronic control units
Carbon monoxide
Nitrogen oxides
Fuel economy
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