Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1992-07-15
1993-05-25
Dolinar, Andrew M.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
123690, 123692, F02D 4114, F02D 4122
Patent
active
052130886
ABSTRACT:
An air-fuel ratio control device comprising an O.sub.2 sensor arranged in an exhaust passage, an air-fuel ratio feedback correction amount calculating unit for calculating an air-fuel ratio feedback correction amount in accordance with an output of the O.sub.2 sensor, an average calculating unit for calculating an average of the air-fuel ratio feedback correction amount each time the output of the air-fuel ratio detecting unit is changed from rich to lean or from lean to rich, a learning unit for calculating a learning correction amount on the basis of the average of the air-fuel ratio feedback correction amount so that the average is converged to a predetermined value, an air-fuel ratio control unit for controlling the air-fuel ratio of the engine on the basis of the air-fuel ratio feedback correction amount and the learning correction amount to become the predetermined air-fuel ratio, an abnormal state determining unit for determining that the fuel supply system is in an abnormal state by comparing a determining value calculated on the basis of the average and the learning correction amount with a predetermined reference value, and a prohibiting unit for prohibiting a determination by the abnormal state determining unit during a predetermined time from a time at which the learning correction amount was renewed.
REFERENCES:
patent: 4539958 (1985-09-01), Ito et al.
patent: 4561400 (1985-12-01), Hattori
patent: 4638658 (1987-01-01), Otobe
patent: 5070847 (1991-12-01), Akiyama et al.
patent: 5094214 (1992-03-01), Kotzan
Toyota Technical Publication 1389, Oct. 30, 1986.
Toyota Technical Publication 1667, Jan. 29, 1987.
Dolinar Andrew M.
Toyota Jidosha & Kabushiki Kaisha
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