Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1986-11-03
1987-09-29
Cox, Ronald B.
Internal-combustion engines
Charge forming device
Fuel injection system
73119A, F02B 300
Patent
active
046962778
ABSTRACT:
An air-to-fuel ratio of an air-fuel mixture in an engine is controlled via a fuel supply system. The fuel supply system operates in accordance with a signal representing a desired air-to-fuel ratio of an air-fuel mixture in the engine. When the fuel supply system operates normally, an actual air-to-fuel ratio of the air-fuel mixture can be essentially equal to the desired air-to-fuel ratio. An actual air-to-fuel ratio of the air-fuel mixture is detected. A malfunction of the fuel supply system is detected in accordance with the detected actual air-to-fuel ratio and the desired air-to-fuel ratio. In the case where the fuel supply system includes fuel injection valves and an air-to-fuel ratio sensor is disposed in an exhaust passage of the engine, a malfunction of at least one of the fuel injection valves may be detected in accordance with whether or not an output signal from the air-to-fuel ratio sensor changes periodically in synchronism with operation cycles of the engine or revolution of the engine.
REFERENCES:
patent: 4006718 (1977-02-01), Konomi
patent: 4119070 (1978-10-01), Asano
patent: 4246566 (1981-01-01), Endo
patent: 4499876 (1985-02-01), Yamamoto
patent: 4502443 (1985-03-01), Hasegawa
patent: 4589401 (1986-05-01), Karim
patent: 4615321 (1986-10-01), Haefner
Cox Ronald B.
Nippondenso Co. Ltd.
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