Patent ID: 7624719

Claim:
A method for controlling a fuel supplying device of an internal combustion engine, comprising: connecting a fuel input to a high-pressure fuel pump having a volume flow control valve to a low-pressure fuel circuit; pressurizing the fuel by the high-pressure fuel pump; delivering the pressurized fuel into a fuel accumulator; connecting an electromechanical pressure regulator to the fuel accumulator and the low-pressure fuel circuit where the electromechanical pressure regulator is configured to stop the flow of fuel from the fuel accumulator into the low-pressure fuel circuit; determining a control deviation from a difference between a specified fuel pressure and a detected fuel pressure; generating in a first operating mode a regulating signal for the volume flow control valve by a first regulator; providing in the first operating mode the control deviation to the first regulator; generating in a second operating mode a regulating signal for the electromechanical pressure regulator by a second regulator; providing in the second operating mode the control deviation to the second regulator; switching from the first operating mode to the second operating mode if the detected fuel pressure is greater than the specified fuel pressure by a first specified amount or a first specified factor; switching from the first operating mode to the second operating mode if the delivery flow of the high-pressure pump is less than a lower switch-over threshold of the delivery flow; and switching from the second operating mode to the first operating mode if the delivery flow of the high-pressure pump is greater than an upper switch-over threshold of the delivery flow.