| 摘要 |
PURPOSE:To improve the coefficient of purifying exhaust by correcting errors by ineffective injection time even in an extremely low fuel flow region in which fuel injection quantity of a fuel injection valve does not correspond to valve opening time and controlling properly fuel supply amount. CONSTITUTION:On the basis of the respective detecting signals of an oxygen sensor 5, intake temperature sensor 8, water temperature sensor 9, throttle position sensor 11, air flow meter 14, rotational frequency sensor 18 and cylinder judging sensor 19, an electronic control circuit 20 controls the valve opening time of a fuel injection valve 6 and the ignition timing of an ignitor 16 according to the running condition. Then, the ineffective injection time of the fuel injection valve 6 is set not only according to battery voltage but also the fuel injection time. Thus, the fuel injection quantity can be controlled to an optimum value corresponding to the running condition even in an extremely low fuel flow region. Hence the coefficient of purifying exhaust is improved.
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