Patent ID: 7066149

Claim:
An internal combustion engine fuel pressure control apparatus comprising: an accumulation chamber that accumulates fuel at a high pressure; fuel pressure control means including a high-pressure fuel pump that intakes fuel and pressure-feeds the fuel to the accumulation chamber and a spill valve that opens/closes a fuel relief path that communicates a booster chamber of the high-pressure fuel pump and a low pressure side; an injector that injects/supplies the high-pressure fuel accumulated in the accumulation chamber to cylinders of the internal combustion engine; a fuel pressure sensor that detects, as fuel pressure, the pressure of the fuel supplied to the injector; and control means that calculates a control quantity of the fuel pressure control means on the basis of fuel pressure information detected by the fuel pressure sensor and which variably sets the pressure of the fuel supplied to the injector by driving/controlling said fuel pressure control means, wherein the control quantity calculated by the control means is configured by a first feedback quantity that feeds back the fuel quantity that the high-pressure fuel pump pressure-feeds to the accumulation chamber and a second feedback quantity that feeds back the timing at which the spill valve opens or closes the fuel relief path.