To improve an injection characteristic and an efficiency of a fuel injection system by arranging a pressure reducing control unit for forming at least one of low fuel pressure during injecting fuel, and controlling the pressure reducing control unit through a valve unit.
A displacement controlling type high pressure pump 2 is disposed in a pressure controlled fuel injection system 1, fuel in a fuel tank 4 is pumped up by its operation, and it is forcibly supplied to a pressure accumulator 6 through a forcibly supplying pipe passage 5. Fuel accumulated therein is led to a distribution device 8 through a valve unit 7, and is distributed to a plurality of high pressure pipe passages 9 led to each of individual cylinders, and then, the fuel is supplied to an injector 10 disposed on a combustion chamber of an internal combustion engine. In this time, fuel is supplied into the injector 10 in such a way that high fuel pressure is depressurized to low fuel pressure through a local pressure reducing control unit 11. An associated value unit 12 is controlled by the pressure reducing unit 11, and thereby, a supplying method is switched into such a way that high fuel pressure is directly supplied to the injector 10 or low fuel pressure is supplied through an orifice 13.
KROPP MARTIN
MAGEL HANS-CHRISTOPH
OTTERBACH WOLFGANG
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