Patent ID: 6807950
Filing Date: 2004-10-26
Classification: F02D,F02M

Abstract:
A fuel injection system for an internal combustion engine, comprising a fuel injection valve (12) which has at least one injection valve member (34) by which at least one injection opening (36) is controlled, in which the injection valve member (34) is urged in an opening direction (35) counter to a closing force by the pressure prevailing in a pressure chamber (44) of the fuel injection valve (12);a pump piston (18) of a high-pressure fuel pump (10) driven in a reciprocating motion by a cam (22) for generating the pressure prevailing in the pressure chamber (44); a control valve (54) actuated by a piezoelectric actuator (58) an electric control unit (53) for triggering the piezoelectric actuator (58) whereby at least indirectly, a communication (71) of the pressure chamber (44) with a relief chamber is controlled; the pressure chamber (44) being disconnected from the relief chamber when the control valve (54) is closed; the control valve (54) having a control valve member (56) coupled with the actuator (58) via a hydraulic coupler (57), the actuator (58), after a charging phase, communicating with an associated voltage meter (72); and the voltage between the electrical terminals (61) of the actuator (58) being monitored for detecting the function of the control valve (54).