Patent ID: 6626151
Filing Date: 2003-09-30
Classification: F02M

Abstract:
A fuel injection system for internal combustion engines, comprising a distributor tube and a high-pressure pump which is driven as a function of engine rpm and serves to generate the fuel pressure and fuel throughput required in the distributor tube in the applicable operating state of the engine, and a fuel metering unit, which is assigned to the high-pressure pump and is based on an electromagnetically actuated regulating valve, wherein the fuel metering unit (10, 11) is disposed in the high-pressure pump, the outlet (36) of the regulating valve (11) discharges into the low-pressure region of the high-pressure pump, and the inlet (32, 33) of the regulating valve (11) communicates with the compression side of a prefeed pump, and wherein the regulating valve (11) has a valve piston (23), which is actuatedâ€”into the opening positionâ€”by a compression spring (25) and which is actuatable counter to the spring forceâ€”into the closing positionâ€”by an armature bolt (14) of the electromagnet (10), wherein in the valve piston (23), having at least one and preferably more radial control openings (35), which are in operative communication with the intake side of the high-pressure pump.