Air-fuel ratio adjusting system for internal combustion engines

Details Air-fuel ratio adjusting system for internal combustion engines Air-fuel ratio adjusting system for internal combustion engines

1977-03-30

1978-08-15

Burns, Wendell E.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123 32EE, 123119D, 123124B, F02B 7510, F02M 700, F02B 300

Patent

active

041064518

ABSTRACT:
An air-fuel ratio adjusting system 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.

REFERENCES:
patent: 3827237 (1974-08-01), Linder et al.
patent: 3923016 (1975-12-01), Hoshi
patent: 3963009 (1976-06-01), Mennesson
patent: 4019470 (1977-04-01), Asano
patent: 4022171 (1977-05-01), Laprade et al.
patent: 4040394 (1977-08-01), Wahl et al.
patent: 4052968 (1977-10-01), Hattori et al.

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