GENERAL MOTORS PHASE 2 CATALYST SYSTEM
A combination of closed loop air/fuel ratio control and three-way catalyst has been introduced on some 1978 GM cars sold in California. The three-way catalytic converter simultaneously acts on hydrocarbons, carbon monoxide, and oxides of nitrogen exhaust pollutants. An exhaust gas sensor gives an indication of rich or lean exhaust, and an electronic control unit processes this information and converts it into a command signal to the carburetor. The closed-loop carburetor controls the air/fuel ratio fed to the engine to the proper levels required for good operation of the catalytic converter. Two engine families are involved in the production of the basic system: one with vacuum actuated metering controls and the other with electromechanically driven metering controls. The 1978 California emission standards are met, and driveability is good while fuel economy loss is minimized.
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Supplemental Notes:
- Presented at the SAE Congress and Exposition, Detroit, 27 February-3 March 1978.
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Corporate Authors:
Society of Automotive Engineers (SAE)
400 Commonwealth Drive
Warrendale, PA United States 15096 -
Authors:
- Canale, R P
- Winegarden, S R
- Carlson, C R
- Miles, D L
- Publication Date: 1978
Media Info
- Features: References;
- Pagination: 13 p.
Subject/Index Terms
- TRT Terms: Carburetors; Catalysts; Catalytic converters; Electronic control; Fuel air mixtures
- Uncontrolled Terms: Air fuel ratio
- Old TRIS Terms: Three-way catalyst
- Subject Areas: Safety and Human Factors;
Filing Info
- Accession Number: 00395638
- Record Type: Publication
- Source Agency: National Highway Traffic Safety Administration
- Report/Paper Numbers: SAE 780205, HS-025 348U
- Files: HSL, USDOT
- Created Date: Jun 30 1985 12:00AM