| 摘要 |
PURPOSE:To prevent excessive feed of fuel when decelerating by providing a selector valve for passages on the upper and lower courses of a supercharger, on a pressure passage to a secondary pressure reducing chamber in an engine with a supercharger using a gaseous fuel, and introducing pressure on the upper course side when said engine is decelerating. CONSTITUTION:The pressure of a gaseous fuel such as an LPG which is fed into an engine 1 with a supercharger 10, is reduced to a defined value in a primary pressure reducing chamber 24, and rendered a pressure corresponding to the pressure of a control pressure chamber 36 in a secondary pressure reducing chamber 31, to be fed from a pipe 41 into a Venturi 11. Either of pressure in a pressure passage 45 on the lower course of the supercharger 10 or pressure in a pressure passage 46 on the upper course of the supercharger 10, is introduced into the control pressure chamber 36 via a selector valve 44. In the normal operation, pressure in the lower course side pressure passage 45 is used, regulating fuel pressure in accordance with the supercharged pressure. When decelerating, the pressure in the upper course side pressure passage 46 which is nearly equal to the atmospheric pressure is used by shifting the selector valve 44, while a solenoid valve 42 is closed to cut off fuel. Thereby, at the time of the following acceleration, excessive feed of fuel will not take place due to the reduced fuel pressure.
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