| 摘要 |
PURPOSE:To improve engine startingness as well as to reduce vibrations and noise in time of light loading, by installing a throttle valve having an opening in a suction passage and a flow rate control device, while controlling them according to a state of engine operation. CONSTITUTION:A throttle valve 5 having an opening 6 in a suction passage 1 of a Diesel engine and a flow rate control device 7 both are installed. In this flow rate control device 7, a flow rate control passage 9 and a control valve 10 driven by a solenoid 11 are installed at a position corresponding to the opening 6 of the throttle valve 5. In time of engine starting, a throttle valve 4 and the control valve 10 being controlled by a signal out of a control circuit into which various engine operating state signals are inputted are kept fully opened. In time of idling, the throttle valve is fully opened, throttling the control valve 10 to a fixed opening range and preventing air form over-feeding, and thus vibrations and noise are reduced. At the time of ordinary running, the throttle valve 4 and the control valve 10 both are kept fully opened and supplied with the sufficient amount of air. |
