| 摘要 |
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 coefficient variable in value in response to the output of an exhaust gas ingredient concentration detecting means, while the engine is operating in a predetermined air-fuel ratio feedback control effecting region. The predetermined air-fuel ratio feedback control effecting region is previously divided into at least first and second subdivided regions. A first mean value of the coefficient is calculated and stored when the engine is operating in the first subdivided region, and a second mean value of same when the engine is operating in the second subdivided region, respectively. The first mean value is used as an initial value of the coefficient, when the engine operation has entered the first subdivided region, and the second mean value when it has entered the second subdivided region, respectively.
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