Patent ID: 6892955

Claim:
In a fuel injection apparatus for an internal combustion engine, a high-pressure fuel pump ( 10 ) and a fuel injection valve ( 12 ) connected to it for each cylinder of the engine, wherein the high-pressure fuel pump ( 10 ) has a pump piston ( 18 ) that is driven into a stroke motion by the engine and delimits a pump working chamber ( 22 ), which is supplied with fuel from a fuel tank ( 24 ), wherein the fuel injection valve ( 12 ) has a pressure chamber ( 40 ) connected to the pump working chamber ( 22 ) and an injection valve element ( 28 ) that controls at least one injection opening ( 32 ), and the pressure prevailing in the pressure chamber ( 40 ) acts in an opening direction ( 29 ) on a pressure surface ( 42 ) embodied on this injection valve element ( 28 ) and can move the valve element in the opening direction ( 29 ) counter to a closing force In order to open the at least one injection opening ( 32 ), having a first control valve ( 68 ) that controls a connection ( 66 ) of the pump working chamber ( 22 ) to a relief chamber ( 24 ), and having a second control valve ( 70 ) that controls a connection ( 64 ) of a control pressure chamber ( 52 ) of the fuel injection valve to a relief chamber ( 24 ), wherein the control pressure chamber ( 52 ) is connected to the pump working chamber ( 22 ) at least indirectly via a connection ( 62 ) that contains a throttle restriction ( 63 ), wherein the control pressure chamber ( 52 ) is delimited by a control piston ( 50 ), which acts in a closing direction on the injection valve element ( 28 ), the improvement wherein, in a stroke position in which the injection valve element ( 28 ) is in its closed position, the control piston ( 50 ) opens a main connection ( 84 ) with a large flow cross section in the connection ( 64 ) of the control pressure chamber ( 52 ) to the relief chamber ( 24 ), wherein in a stroke position of the control piston ( 50 ) in which the injection valve element ( 28 ) is opened by its maximal stroke, the control piston ( 50 ) closes the main connection ( 84 ) and only a bypass connection ( 80 ) with a small flow cross section remains open, and wherein the bypass connection ( 80 ) is embodied in a housing part ( 54 ) that delimits the control pressure chamber ( 52 ).