| 摘要 |
PURPOSE:To shorten the warming time by increasing the inhaled air amount when the increase of the inhaled air amount continues over a prescribed time, in the air-amount increasing operation for the engine operation with the relatively higher revolution speed when the engine is cold. CONSTITUTION:A control valve 13 is installed into a bypass passage 12 formed so as to make a detour around a throttle valve 10 in an intake passage, and the idle revolution speed is controlled by controlling the opening degree of the control valve 13. Said control valve 13 is constituted so as to move a valve pipe 25 by a step motor 26, and said step motor 26 is controlled according to the engine operation state by an electronic control circuit 20. In other words, when the cooling-water temperature detected by a water temperature sensor 9 is below a prescribed value, the intake air amount is increased, and the engine is operated with the revolution speed higher than the idle revolution speed after warming. When the increase of the inhaled air amount continues over a prescribed time, the intake air amount is increased furthermore.
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