Air-fuel ratio adjusting system for internal combustion engines
Patent
·
OSTI ID:6491354
An air-fuel ratio adjusting system is described that controls the amount of additional air supply through the bypass passage of the carburetor to ensure optimum engine operation even in a warming up condition of the engine. The air-fuel ratio adjusting system includes an air-fuel ratio sensor disposed in the exhaust manifold, a warm-up sensor for detecting the temperature of engine cooling water or engine block, and a control unit for providing a control signal to a driving motor for the bypass valve. The bypass valve is controlled so that the air-fuel ratio of the mixture becomes the stoichiometric one and at the same time, during the warming up condition, the maximum opening of the bypass valve is limited to a predetermined degree depending on the temperature of the engine.
- Assignee:
- Nippon Soken, Inc.
- Patent Number(s):
- US 4106451
- OSTI ID:
- 6491354
- Country of Publication:
- United States
- Language:
- English
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