Patent ID: 7007670

Claim:
An operation control method using a fuel injection device, comprising: pressurizing fuel from a fuel tank using a high-pressure pump so that the pressurized fuel is stored in a common rail; supplying the pressurized fuel stored in the common rail to an injection nozzle connected to the common rail; and controlling the pressure of the pressurized fuel stored in the common rail by using a low-pressure control solenoid valve upstream of the high-pressure pump, and by using a high-pressure control solenoid valve downstream of the high-pressure pump, the low-pressure control solenoid valve and the high-pressure control solenoid valve being selectively feedback-controlled to control the pressure of the pressurized fuel stored in the common rail; wherein, when a pressure in the common rail exceeds a predetermined value and the high-pressure control solenoid valve is being used to control the pressure of the pressurized fuel stored in the common rail, said controlling comprises: determining a driving current of the high-pressure control solenoid valve using a prescribed value map defining a correlation between the pressure of the pressurized fuel stored in the common rail and the driving current of the high-pressure control solenoid valve; correcting the determined driving current of the high-pressure control solenoid valve based on an actual pressure in the common rail and the driving current of the high-pressure control solenoid valve at the actual pressure; and supplying the corrected driving current to the high-pressure control solenoid valve.