| 摘要 |
PURPOSE:To prevent the erroneous correction of air-fuel ratio on the basis of the fuel jetted out in the past by varying the aimed value of air-fuel ratio on the lean side after the lapse of a prescribed time after the fuel injection quantity is varied, when the fuel injection quantity is varied according to the operation state. CONSTITUTION:Each detection value of a pressure sensor 6 for detecting the negative pressure in a suction pipe, idle switch 10, lean sensor 30, cylinder discriminating sensor 46, revolution angle sensor 48, etc. is input into an electronic control circuit 44, and the injection quantity of fuel supplied from a fuel injection valve 24 is controlled according to the operation state. Further, the feedback control to the aimed air-fuel ratio on the lean side corresponding to the operation state is carried out on the basis of the output of the lean sensor. When the operation state is varied, feedback correction corresponding to the operation state before the change is carried out for a prescribed timer after the fuel injection quantity is varied, and ten the aimed air-fuel ratio is varied to that corresponding to the new operation state, and feedback correction is carried out.
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