| 摘要 |
PROBLEM TO BE SOLVED: To compensate any slippage in an air-fuel ratio due to the response delay of a large-area type air-fuel ratio sensor. SOLUTION: Various state quantities of an engine are inputted (S1), a target air-fuel ratio TGLMD is set up (S2) from engine speed Ne and basic fuel injection quantity TP, a variationΔQ of intake air flow rate, a variationΔTVO of throttle valve opening, and a variationΔA/F of air-fuel ratio detected value are all calculated (S3), while a zero-order delay till the detected value of an air-fuel ratio sensor starts its change to a target air-fuel ratio change is calculated (S4), likewise a first-order delay till the detected value comes to the target air-fuel ratio TGLMD after being changed since it has started the change is calculated (S5), and then a proportional part P is compensated from the zero- order delay (S6), and further an integral part I is compensated (S7) from the first-order delay as well.
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