Patent ID: 7428894

Claim:
A fuel pressure controller applied to a fuel supply system having a fuel pump, which is driven by a driving force of an internal combustion engine to discharge and to pressure-feed fuel to a pressure accumulation chamber accumulating the pressure-fed fuel at a high-pressure state and which has an electromagnetic discharge metering valve for regulating a fuel amount discharged to an outside by the fuel pump out of fuel suctioned by the fuel pump, the fuel pump being capable of performing the fuel discharge in a certain shortest cycle, the fuel pressure controller comprising: a control device that controls the fuel pressure in the pressure accumulation chamber by operating the discharge metering valve; and a reduction device that reduces the number of operations of the discharge metering valve to lengthen an interval between the pressure-feeding operations with respect to the shortest cycle when rotation speed of the engine is equal to or higher than predetermined speed, wherein the fuel pump has a plunger driven by the driving force of the engine to reciprocate between a top dead center and a bottom dead center; and the reduction device is configured to reduce the number of operations of the discharge metering valve by alternating between (a) providing a state in which the discharge metering valve is not operated even when the plunger mechanically enters a pressure-feeding stroke such that the fuel is not pressure-fed, and (b) providing a state in which the discharge metering valve is operated when the plunger mechanically enters the pressure-feeding stroke such that the fuel is pressure-fed.