| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the necessity of a pressure reducing valve and a fuel returning passage so as to miniaturize a device and reduce costs by providing a two-way type valve in a fuel supply passage extended from a forced-feed pump to a fuel pressure accumulation part and causing fuel in the fuel pressure accumulation part to reversibly flow to the forced-feed pump during the decompression of the fuel pressure accumulation part. SOLUTION: During the normal running of an engine, fuel in a fuel tank 1 is supplied by a feed pump 3 through a fuel supply passage 2 into the plunger room 7 of a forced-feed pump 4. The fuel in the plunger room 7 is pressurized by a plunger 6 and, when a pressure in the plunger room 7 reaches a pressure higher in a fuel pressure accumulation part 10, the fuel is supplied to the fuel pressure accumulation part 10. Then, during the speed reduction of the engine, for reducing a fuel pressure in the fuel pressure accumulation part 10, the forced-feed pump outlet valve of a actuator 9 for an outlet valve is opened and, when the plunger 6 is lowered, the fuel in the fuel pressure accumulation room 7 is supplied reversibly to the forced-feed pump 4 and then the pressure in the fuel pressure accumulation part 10 and the pressure in the plunger room 7 are reduced. |
