| 摘要 |
PURPOSE:To suppress the frequent opening/closing operation of an ISC valve by controlling the ISC valve interposed in an air passage to bypass a suction throttle valve so that the driving period may be large when the ON condition of an idle switch is elapsed for the idling judging time at the water temperature to judge the warming-up is completed. CONSTITUTION:An ISC(Idle Speed Control) valve 46 is interposed in the middle of a bypass air passage 44 provided so as to bypass a suction throttle valve 26, and the idling number of revolution is stabilized by opening/closing the valve. The driving period of the ISC valve 46 is controlled so as to be the driving period long which is larger than the traditional driving period when the temperature of the cooling water by a water temperature sensor 64 is above the water temperature to judge that the warming-up is completed, and the ON condition of a throttle sensor 54 which is also the idle switch is elapsed by the idling judging time. When the load is fluctuated, the driving period of the ISC valve 46 is controlled to return to the preset driving period, e.g. the driving period short. |
