Air-fuel ratio control apparatus for multicylinder engine

Details Air-fuel ratio control apparatus for multicylinder engine Air-fuel ratio control apparatus for multicylinder engine

1988-09-06

1990-03-20

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Fuel injection system

123198F, F02D 4114, F02D 4104, F02D 1702

Patent

active

049092235

ABSTRACT:
In an apparatus of the type in which the air-fuel ratio of an engine is detected by an air-fuel ratio sensor and the air-fuel ratio is feedback-controlled in accordance with the detection result to operate the engine at a desired air-fuel ratio, a change of the output characteristic of the air-fuel ratio sensor is always corrected for. The apparatus includes means for detecting the air-fuel ratio of the engine from its exhaust gas composition, means for determining whether the engine is in a given constant operating condition, means for determining a desired air-fuel ratio for the constant operating condition, means for supplying the quantity of fuel corresponding to the desired air-fuel ratio to each cylinder of the engine, means for causing some of all the cylinders of the engine not greater in number than N-1 (N represents the total number of cylinders) to misfire when the engine comes into the constant operating condition, and means for correcting the output characteristic of the air-fuel ratio detecting means in accordance with the amount of change of the output of the air-fuel ratio detecting means before and after the misfiring.

REFERENCES:
patent: 4107921 (1978-08-01), Iizuka
patent: 4186715 (1980-02-01), Iizuka et al.
patent: 4201180 (1980-05-01), Iizuka
patent: 4256074 (1981-03-01), Sugasawa et al.
patent: 4594984 (1986-06-01), Raff et al.
patent: 4676213 (1987-06-01), Itsuji et al.

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