Method and apparatus for detection and diagnosis of air-fuel rat

Details Method and apparatus for detection and diagnosis of air-fuel rat Method and apparatus for detection and diagnosis of air-fuel rat

1990-06-14

1991-09-17

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Fuel injection system

123489, F02D 4114, F02D 4122

Patent

active

050484907

ABSTRACT:
In a fuel supply control apparatus constructed so that a fuel supply quantity is feedback-controlled to bring a detected value of an air-fuel ratio of an air-fuel mixture sucked in an engine to a target air-fuel ratio, a disorder of air-fuel ratio-detecting means is diagnosed based on a change of the balance of the response characteristic of the air-fuel ratio-detecting means in both the change directions of the air-fuel ratio, a change of an output value of the air-fuel ratio-detecting means or a change of the frequency of the feedback control.

REFERENCES:
patent: 3938075 (1976-02-01), Reddy
patent: 4502443 (1985-03-01), Hasegawa et al.
patent: 4739740 (1988-04-01), Ohkawara et al.
patent: 4751908 (1988-06-01), Abe et al.
patent: 4819601 (1989-04-01), Harada et al.
patent: 4887576 (1989-12-01), Inamoto et al.
patent: 4951632 (1990-08-01), Yakuwa et al.

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