Method of controlling air-fuel ratio of an engine

Details Method of controlling air-fuel ratio of an engine Method of controlling air-fuel ratio of an engine

1984-11-02

1986-07-08

Cox, Ronald B.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

F02B 300

Patent

active

045986827

ABSTRACT:
A method of controlling air-fuel ratio of an internal combustion engine is disclosed. An oxygen sensor is mounted to the engine to detect oxygen concentration in the exhaust gas from the engine and generate a voltage signal therefrom. The air-fuel is a controlled ratio in accordance with the detected result. The oxygen concentration is sampled in synchronism with the rotational speed of the engine, and sampled results are stored as a correction factor by taking the engine rotational speed into account. The air-fuel ratio is controlled by correction factor previously stored in the preceding sampling time of a given sampling time when a change of the air-fuel ratio is detected by comparing its voltage signal with a reference voltage of the oxygen sensor.

REFERENCES:
patent: 4111171 (1978-09-01), Aono
patent: 4122811 (1978-10-01), Bowler
patent: 4224910 (1980-09-01), O'Brien
patent: 4235204 (1980-11-01), Rice
patent: 4307694 (1981-12-01), Jacobs
patent: 4391250 (1983-07-01), Matsui
patent: 4397278 (1983-08-01), Hughes

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