Patent ID: 7096857

Claim:
In a system for injecting fuel into the combustion chamber of a self-igniting internal combustion engine, having a control unit ( 6 , 80 ), which acts upon a spring-controlled injection device ( 56 ) which includes a nozzle needle ( 58 ), the control unit ( 6 , 80 ) including a first valve ( 10 ) and a second valve ( 11 ), which each include one pressure chamber ( 28 , 36 ) which communicate with one another via a pressure line ( 32 , 81 ), the improvement wherein the first valve ( 10 ) and the second valve ( 11 ) are connected in series, and the first valve ( 10 ) controls the subjection of the pressure chamber ( 36 ) of the second valve ( 11 ) to pressure, and the level ( 91 , 92 ) of the injection pressure during the injection phases ( 86 , 87 , 88 ; 90 ) is controlled by the second valve ( 11 ), wherein the second valve ( 11 ), which can be acted upon via the first valve ( 1 O), is embodied as a 2/2-way valve, from whose pressure chamber ( 36 ) a high-pressure outlet ( 3 ) extends to the nozzle chamber ( 59 ) of the injection device ( 56 ), and wherein the second valve ( 11 ) comprising a valve body ( 35 ) including a conical seat ( 39 ) above which a throttle restriction ( 37 ) is disposed that communicates with a longitudinal bore ( 38 ) pointing toward the high-pressure outlet ( 2 ).