Air-fuel ratio control system for internal combustion engine

Details Air-fuel ratio control system for internal combustion engine Air-fuel ratio control system for internal combustion engine

1993-08-16

1995-01-17

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123679, F02D 4114, F02D 4132

Patent

active

053817745

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine equipped with a three-way catalytic converter. The air-fuel ratio control system is basically arranged to feedback-control air-fuel ratio of air-fuel mixture to be supplied to the engine to fall in a stoichiometric range by regulating a basic fuel supply amount in accordance with an air-fuel ratio feedback correction coefficient. The air-fuel ratio feedback correction coefficient is corrected with an integrated amount which is set to be increased after the measured value of a lapsed engine revolution number exceeds a decision standard. The lapsed engine revolution number is stored in the memory, and the average value of the lapsed engine revolution number is renewed with this stored lapsed engine revolution number in the memory. This average value or a value depending upon this average value is set as the decision standard, so that the decision standard is suitably controlled in accordance with situations of the engine thereby precisely obtaining a suitable decision standard regardless of difference in response performance or deteriorated response performance of oxygen sensors.

REFERENCES:
patent: 4603670 (1986-08-01), Bertsch et al.
patent: 4744344 (1988-05-01), Morozumi
patent: 5094214 (1992-03-01), Kotzan
patent: 5158062 (1992-10-01), Chen
patent: 5163407 (1992-11-01), Yoshida et al.
patent: 5168701 (1992-12-01), Yamamoto et al.
patent: 5213088 (1993-05-01), Harada

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