Air-fuel ratio control method for internal combustion engines

Details Air-fuel ratio control method for internal combustion engines Air-fuel ratio control method for internal combustion engines

1986-09-17

1987-09-22

Wolfe, Jr., Willis R.

Internal-combustion engines

Charge forming device

Fuel injection system

F02D 4114

Patent

active

046948058

ABSTRACT:
A method of effecting feedback control of the air-fuel ratio of an air-fuel mixture being supplied to an internal combustion engine, by correcting a basic fuel supply quantity by the use of a correction coefficient variable in response to the output of an exhaust gas ingredient concentration sensor. An engine low-load operating region is defined by at least one parameter representing load on the engine. When the engine enters the low-load operating region, a value of the correction coefficient is determined in response to an output from the above sensor and also an average value of values of the correction coefficient thus determined is calculated for a predetermined time period after the engine enters the low-load operating region. A target value of the correction coefficient is calculated on the basis of the average value obtained, the target value yielding a predetermined air-fuel ratio higher than a stoichiometric mixture ratio. The value of the correction coefficient is varied after the lapse of the predetermined time period and until it becomes equal to the target value while the engine remains in the low-load operating region. The basic fuel supply quantity is corrected by the use of the value of the correction coefficient thus varied.

REFERENCES:
patent: 4357828 (1982-11-01), Nakano
patent: 4391130 (1983-07-01), Nakano et al.
patent: 4392471 (1983-07-01), Miyagi et al.
patent: 4517949 (1985-05-01), Ito et al.
patent: 4552115 (1985-11-01), Okino
patent: 4615319 (1986-10-01), Tomisawa

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