| 摘要 |
PURPOSE:To suppress the fluctuation of air-fuel ratio by setting up a feedback correction value in cases where the deviation between an actual air-fuel ratio and a theoretical air-fuel ratio is less than a fixed value, and then setting up a feedback correction value so that the deviation is to be eliminated in cases where it is not less than the fixed value. CONSTITUTION:When an engine 1 is in operation, an ECU 27 calculates the pulse width of the basic fuel injection according to the intake air quantity per one cycle of engine. In addition, it calculates air-fuel ratio correction factors so that the air-fuel ratio comes to a desired air-fuel ratio, and at the same time, feedback controls air-fuel ratios by way of calculating feedback correction values for causing, by a feedback control, air-fuel ratios to converge to the desired air-fuel ratio in response to the operating conditions of the engine 1. In this case, when the deviation between an actual air-fuel ratio and the desired air-fuel ratio is not more than a fixed value, a fixed feedback correction value is set up regardless of the fluctuation of the desired air-fuel ratio, while, when said deviation is more than the fixed value, a feedback correction value is set up so that the deviation is to be eliminated.
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