Abstract: The fuel injection system has a fuel injection valve acted upon by the pressure prevailing in a pressure chamber of the fuel injection valve and is movable by this pressure, counter to the force of a closing spring, in an opening direction to open the at least one injection opening, and fuel is delivered under high pressure to the pressure chamber by a high-pressure fuel pump for a fuel injection. The injection valve member is urged in the closing direction at least indirectly by a variable pressure prevailing in a spring chamber of the fuel injection valve. The spring chamber has a communication with a pressure source, which is controlled by a valve whereby different opening pressures of the fuel injection valve for a preinjection and a main injection of fuel can be attained.

Abstract: The invention relates to a unit injector system for supplying the combustion chamber of a self-igniting internal combustion engine with fuel. The unit injector system has a high-pressure chamber that can be subjected to pressure via a pump piston. A storage piston is received inside a storage chamber and is acted upon via a compression spring disposed in a spring holder. A return flow throttle element, which delays the buildup of pressure in the storage chamber, is disposed between the high pressure chamber and the storage chamber of the storage piston.

Abstract: The fuel injection system has a fuel injection valve (12) with an injection valve member (34), by which at least one injection opening (36) is controlled, and the injection valve member (34) is acted upon by the pressure prevailing in a pressure chamber (44) of the fuel injection valve (12) and is movable by this pressure, counter to the force of a closing spring (48) disposed in a spring chamber (50), in an opening direction to open the at least one injection opening (36), and fuel is delivered under high pressure to the pressure chamber (44) by a high-pressure fuel pump (10) for a fuel injection. The injection valve member (34) is urged in the closing direction at least indirectly by the pressure prevailing in a spring chamber (50) of the fuel injection valve (12). The pressure in the spring chamber (50) is variable; the spring chamber (50) has a communication with a pressure source (66; 20), which is controlled by a valve (67).

Abstract: The fuel injection system has a fuel injection valve (12) with an injection valve member (34), by which at least one injection opening (36) is controlled, and the injection valve member (34) is acted upon by the pressure prevailing in a pressure chamber (44) of the fuel injection valve (12) and is movable by this pressure counter to the force of a closing spring (40) in an opening direction to control to open the at least one injection opening (36), and fuel is delivered under high pressure to the pressure chamber (44) by a high-pressure fuel pump (10) for a fuel injection. The injection valve member (34) is urged in the closing direction at least indirectly by the a variable pressure prevailing in a control chamber (50) of the fuel injection valve (12). The pressure in the control chamber (58) is variable; the control chamber (58) has a communication with a pressure source (66; 20), which is controlled by a valve (67).

Abstract: The invention relates to a unit injector system for supplying the combustion chamber of a self-igniting internal combustion engine with fuel. The unit injector system has a high-pressure chamber that can be subjected to pressure via a pump piston. A storage piston is received inside a storage chamber and is acted upon via a compression spring disposed in a spring holder. A return flow throttle element, which delays the buildup of pressure in the storage chamber, is disposed between the high pressure chamber and the storage chamber of the storage piston.

Abstract: In a fuel injection system for internal combustion engines, having two control valves (15, 34), provided for controlling the injection event, whose valve bodies each have one magnetically attractable armature (41, 45), and having a common magnet coil (40) for the two armatures (41, 45), in a first current stage of the common magnet coil (40), only one armature (41), and in a higher second current stage both armatures (41, 45), are each attractable counter to the action of a closing force. Thus with only a single magnet drive mechanism, two valve functions can be switched via two exciter currents of different magnitudes.