Patent ID: 7216628

Claim:
A fuel injection apparatus comprising: a common rail that accumulates high pressure fuel; an injector that injects the high pressure fuel, which is accumulated in the common rail; a supply pump arrangement that includes a high pressure pump, which has a pressurizing chamber, wherein the high pressure pump draws and pressurizes fuel in the pressurizing chamber and discharges the pressurized fuel from the pressurizing chamber to the common rail; an intake metering valve that is arranged in a fuel passage, which is communicated with the pressurizing chamber to supply the fuel to the pressurizing chamber, wherein a degree of opening of the intake metering valve is variable to control an actual pressure, which is accumulated in the common rail; a rail pressure sensor that senses the actual rail pressure, which is accumulated in the common rail; a feedback control means for feedback-controlling the degree of opening of the intake metering valve in a manner that approximates the actual rail pressure, which is measured with the rail pressure sensor, to a target rail pressure; a disorder degree sensing means for sensing a disorder degree of the actual rail pressure, which is sensed with the rail pressure sensor; and a limiting means for limiting an increase in the degree of opening of the intake metering valve when the disorder degree of the actual rail pressure, which is sensed by the disorder degree sensing means, is relatively large and thereby exceeds a predetermined value.