| 摘要 |
PURPOSE:To prevent generation of engine stall by providing an air passage for thermal harm, which is provided in order to bypass an intake throttle valve and being interposed a control valve for thermal harm, and opening-operating the control valve for thermal harm when a prescribed condition is satisfied so as to increase an air amount. CONSTITUTION:A bypass passage 30 for bypassing an intake throttle valve 10 whose one end side is connected to the intake passage 4 provided downstream from the compressor 14 of a supercharger 12 and the other end side is connected to the intake passage 4 leading to a combustion chamber, is provided on the intake passage 4, and an idle rotational speed control valve 32 is interposed on the way thereof. And an air passage for thermal harm is provided interposing with a control valve 56 for thermal harm so as to bypass the intake throttle valve 10. When it is judged by a control unit 44 that an intake air temperature is a set intake air temperature or more, for example 80 deg.C or more and a water temperature is a set water temperature or more, for example 110 deg.C or more at the time of idle operation, and when a duty ratio is 90% or more in a set value at the time of ON-operation of an air conditioner, the control valve 56 for thermal harm is opened, and control is carried out so as to increase an air amount. |
