Patent ID: 6896208
Filing Date: 2005-05-24
Classification: F02M

Abstract:
1. In a fuel injection system for an internal combustion engine, having one high-pressure fuel pump ( 10 ) and one fuel injection valve ( 12 ), communicating with it, for each cylinder of the engine, wherein the high-pressure fuel pump ( 10 ) has a pump piston ( 18 ), which is driven by the engine in a reciprocating motion and defines a pump work chamber ( 22 ) that communicates with a pressure chamber ( 40 ) of the fuel injection valve ( 12 ), and the fuel injection valve ( 12 ) has at least one first injection valve member ( 28 ), by which at least one first injection opening ( 32 ) is controlled and which is movable, urged by the pressure prevailing in the pressure chamber 40 , counter to a closing force, in an opening direction ( 29 ) to uncover the at least one first injection opening ( 32 ), and having a control valve ( 70 ), actuated by a piezoelectric actuator ( 84 ), by which at least indirectly a connection of the pump work chamber ( 22 ) with a relief region ( 78 ) is controlled, the improvement wherein the first injection valve number ( 28 ) is hallow, and wherein the fuel injection valve ( 12 ) comprises a second injection valve member ( 128 ) guided displaceably inside the hollow first injection valve member ( 28 ), by which second injection valve member at least one second injection opening ( 132 ) is controlled and which is movable, urged by the pressure prevailing in the pressure chamber ( 40 ), counter to a closing force, in the opening direction ( 29 ); wherein the second injection valve member ( 128 ) is urged in a closing direction at least indirectly by the pressure prevailing in a fuel-filled control pressure chamber ( 60 ); and wherein the pressure prevailing in the control pressure chamber ( 60 ) is controlled variably as a function of engine operating conditions.