Patent ID: 7328689

Claim:
A method for monitoring a fuel supply device of an internal combustion engine having a low pressure fuel circuit, comprising: connecting a high pressure pump having an input side to the low pressure fuel circuit; connecting a fuel volume flow control valve to the high pressure pump; receiving a pressurized fuel by a fuel accumulator from the high pressure pump; connecting an electromechanical pressure regulator to the fuel accumulator; detecting a pressure of the pressurized fuel; providing the detected fuel pressure to a first fuel pressure regulator as a control deviation; generating in a first operating mode a regulating signal for the fuel volume flow control valve by a first regulator wherein the first regulator comprises an integral part and a difference in a specified fuel pressure; determining in a first operating mode an error in the fuel supply device as a function of the integral part of the first regulator; generating in a second operating mode a regulating signal for the electromechanical pressure regulator by a second regulator wherein the difference in the specified fuel pressure and the detected fuel pressure is supplied to the second regulator as the control deviation; and determining in a second operating mode an error in the fuel supply device as a function of the detected fuel pressure and the regulating signal for the electromechanical pressure regulator.