| 摘要 |
PURPOSE:To improve the control response performance by detecting the signal of engine operation state at a plurality of operation points and switching the number of operation points for judging air-fuel ratio in each case of autodrive and nonautodrive. CONSTITUTION:The air-fuel ratio is varied in a certain cycle between the thick side and lean side by opening and closing a bypass air solenoid valve 13 installed in a bypass pipe 11 which detours around a throttle valve 4, and a calculation circuit 4 discriminates the direction of the air-fuel ratio with which the fuel consumption rate is improved, and thus the air-fuel ratio is corrected. During the engine operation, it is judged that the operation at present is in autodrive control or not. When the operation is not in autodrive control, the revolution cycles Nl-1, Ngamma-1, Nl, and Ngamma in four times in the past including the revolution cycle Ngamma at present are compared. While, in autodrive control, the revolution cycles Ngamma-1, Nl, and Ngamma in three times in the past are compared, and the correction portion of the fuel injection pulse width is calculated according to the result of comparision, and thus a fuel injection valve 15 is controlled according to the correction pulse width.
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