Patent ID: 6976473

Claim:
In a fuel injection system for an internal combustion engine, having a high-pressure pump ( 14 ), by which fuel is pumped into a reservoir ( 16 ) with which reservoir injectors ( 20 ) disposed at cylinders of the engine communicate, having a feed pump ( 12 ) by which fuel is pumped from a fuel tank to the intake side of the high-pressure pump ( 14 ), and having a fuel metering device ( 44 ), which is triggered by a control unit ( 23 ) and is disposed between the compression side of the feed pump ( 12 ) and the intake side of the high-pressure pump ( 14 ) and by which control unit the fuel quantity delivered to the intake side of the high-pressure pump ( 14 ) is set, the improvement wherein the fuel metering device comprises a clocking valve ( 44 ), which is opened and closed in pulse-width-modulated fashion by the control unit ( 23 ), and the fuel quantity delivered to the intake side of the high-pressure pump ( 14 ) is proportional to the opening duration of the clocking valve ( 44 ); and wherein the frequency of the pulse width modulation of the clocking valve ( 44 ) is adjusted preferably synchronously with the rpm or with a multiple of the rpm of the high-pressure pump ( 14 ).