Air-fuel ratio feedback control method for internal combustion e

Details Air-fuel ratio feedback control method for internal combustion e Air-fuel ratio feedback control method for internal combustion e

1990-07-30

1991-02-19

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Fuel injection system

123440, F02D 4114

Patent

active

049933930

ABSTRACT:
A method of controlling air-fuel ratio of a mixture supplied to an internal combustion engine in a feedback manner responsive to an output signal from an exhaust gas concentration sensor. The air-fuel ratio of the mixture is controlled to a desired value by means of proportional control and integral control. The proportional control is inhibited, when the value of the output signal has changed from a lean side to a rich side with respect to a predetermined reference value while the engine is operating in one of a predetermined high load condition and a predetermined high rotational speed condition.

REFERENCES:
patent: 4137877 (1979-02-01), Saito
patent: 4401086 (1983-08-01), Miyagi
patent: 4411236 (1983-10-01), Matsui et al.
patent: 4461258 (1984-07-01), Becker et al.
patent: 4739740 (1988-04-01), Ohkawara et al.

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