Air-fuel ratio controller for internal combustion engine

Details Air-fuel ratio controller for internal combustion engine Air-fuel ratio controller for internal combustion engine

1991-04-30

1992-05-26

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Fuel injection system

123440, F02M 5100

Patent

active

051157810

ABSTRACT:
A relation with output characteristic of an oxygen density sensor corresponding to a deviation of an air fuel ratio of a mixed gas supplied actually to an internal combustion engine from a desired air fuel ratio is stored beforehand in an air fuel ratio controller of the present invention. Then, the air fuel ratio deviation is computed correspondingly to an actual output of the oxygen density sensor according to the stored relation, and an air fuel ratio controlled variable is corrected according to the computed air fuel ratio deviation, thereby controlling the air fuel ratio to the desired air fuel ratio. Further, a change in output characteristic of the oxygen density sensor to the air fuel ratio is detected, then the output characteristic of the oxygen density sensor stored beforehand is corrected according to the detection result, and thus if the output characteristic of the oxygen density sensor fluctuates due to a deterioration arising on the oxygen density sensor, the air fuel ratio controlled variable will be decided in consideration of the fluctuation.

REFERENCES:
patent: 4870586 (1989-09-01), Asakura et al.
patent: 4870938 (1989-10-01), Nakaniwa
patent: 4873642 (1989-10-01), Mieno et al.
patent: 4878472 (1989-11-01), Nibino
patent: 4941448 (1990-07-01), Nakaniwa et al.
patent: 4958612 (1990-09-01), Kato et al.
patent: 4981125 (1991-01-01), Kato et al.

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