| 摘要 |
PURPOSE:To prevent the occurrence of an excessive rich state of fuel during coasting, by a method wherein a control valve is opened for a given time during the cold state of an engine even after a throttle valve is fully closed from the state of some opening. CONSTITUTION:A control valve 4 is located in an air passage 5 bypassing between the upper stream side and the downstream side of a throttle valve 6. By means of a signal from a control unit 1, the flow rate of the air flowing through the air passage 5 is controlled. When, by means of a signal from a water temperature sensor 2, it is decided that an engine is in a cold state, the control valve is opened for a given time even after the throttle valve is fully closed. This prevents the occurrence of an excessive rich state of fuel during coasting.
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