Abstract: The invention relates to a device for actuating a control piston or nozzle needle (27) via a control chamber (26). The control chamber communicates via a control chamber line (25) with valve chambers (3, 22) of a 3/2-way valve (5). The valve body (6, 40, 51) of this valve is switchable by means of an actuator (11). By means of a restoring spring (14), the valve body (6, 40, 51) is acted upon such that a seat portion (7), embodied in the housing (4) on the valve body (6, 40, 51), is put into its valve seat (20). The valve body (6, 40, 51) of the 3/2-way valve (5) has a seat portion (7) and a longitudinal slide portion (8), as well as hydraulic faces (31,32), facing one another, that make the state of pressure equilibrium of the valve body (6, 40, 51) possible. The valve body (6, 40, 51) is moved to different stroke lengths (10; 23, 24) by means of an actuator (11).

Abstract: A device for injecting fuel into the combustion chambers of an internal combustion engine, with an injector enclosed by an injector housing, whose control chamber is acted on by a control volume, and with control valves for increasing/relieving the pressure in the nozzle chamber of the injector and in the control chamber of the injector. The control valves are disposed in parallel to one another. They are hydraulically coupled to one another without side effects by means of a coupling chamber, and are actuated by means of an actuator that can be switched into different stroke levels.

Abstract: The invention relates to a device for actuating a control piston or nozzle needle (27) via a control chamber (26). The control chamber communicates via a control chamber line (25) with valve chambers (3, 22) of a 3/2-way valve (5). The valve body (6, 40, 51) of this valve is switchable by means of an actuator (11). By means of a restoring spring (14), the valve body (6, 40, 51) is acted upon such that a seat portion (7), embodied in the housing (4) on the valve body (6, 40, 51), is put into its valve seat (20). The valve body (6, 40, 51) of the 3/2-way valve (5) has a seat portion (7) and a longitudinal slide portion (8), as well as hydraulic faces (31,32), facing one another, that make the state of pressure equilibrium of the valve body (6, 40, 51) possible. The valve body (6, 40, 51) is moved to different stroke lengths (10; 23, 24) by means of an actuator (11).

Abstract: The invention relates to a device for injecting fuel into the combustion chambers of an internal combustion engine, with an injector (3) enclosed by an injector housing (2), whose control chamber (12) is acted on by a control volume, and with control valves (14, 15) for increasing/relieving the pressure in the nozzle chamber (10) of the injector (3) and in the control chamber (12) of the injector (3). The control valves (14, 15; 35) are disposed in parallel to one another. They are hydraulically coupled to one another without side effects by means of a coupling chamber (11), and are actuated by means of an actuator (13) that can be switched into different stroke levels.

Abstract: The invention relates to a method for shaping the injection pressure course (27) in injectors, which are used for instance in injection devices of injection systems in motor vehicles. The injection device includes a pump part (1) and an injection nozzle part (2). The pump part (1) and injection nozzle part (2) communicate with one another via a high-pressure line (3). Control valves (8, 10) which are triggered by means of an actuator (9) are contained in the pump part (1). By the triggering by means of the actuator (9), injection parameters during the preinjection phase (28), pressure buildup phase (29) and main injection phase (30) are determined.

Abstract: The fuel injection apparatus has one fuel pump for each cylinder, which has a pump piston, driven by the engine, that defines a pump work chamber, which communicates via a line with a fuel injection valve, disposed on the engine separately from the fuel pump, which valve has an injection valve member, by which at least one injection opening is controlled, and which is movable in the opening direction, counter to a closing force, by the pressure generated in the pump work chamber; a first electrically triggered control valve controls a communication of the line with a relief chamber. A second electrically triggered control valve is also disposed on the fuel injection valve and controls the pressure prevailing in a control pressure chamber of the fuel injection valve, which pressure urges the injection valve member in the closing direction.

Abstract: A unit fuel injector (10) is used to inject fuel into the combustion chamber of an internal combustion engine. This is accomplished by opening a valve element (28) counter to a valve prestressing force by means of increasing a system pressure. Moreover, the system pressure is raised to a value above a normal valve opening pressure, so that the valve element opens for a main injection counter to the valve prestressing force. While the system pressure is being raised, the valve prestressing force is also increased, in such a way that a valve closing pressure that is increased because of the increased valve prestressing force is always below the system pressure. The system pressure is then lowered and to a value below the valve closing pressure, so that the valve element closes. Next, the system pressure is increased again, so that the valve element opens for a postinjection, at a valve opening pressure that is increased because of the increased valve prestressing force.

Abstract: The fuel injection apparatus has one fuel pump for each cylinder of the engine, which pump has a pump piston, driven by the engine in a reciprocating motion, that defines a pump work chamber, which communicates via a line with a fuel injection valve, disposed on the engine separately from the fuel pump, which valve has an injection valve member, by which at least one injection opening is controlled, and which is movable in the opening direction, counter to a closing force, by the pressure generated in the pump work chamber, and at least one first electrically triggered control valve is provided, by which a communication of the pump work chamber with a relief chamber is controlled, and which is disposed near the fuel pump.

Abstract: The fuel injection apparatus for internal combustion engines has one fuel pump for each cylinder of the engine, which pump has a pump piston, driven by the engine in a reciprocating motion, that defines a pump work chamber to which fuel is delivered from a fuel tank and which communicates with a fuel injection valve that has an injection valve member by which at least one injection opening is controlled and which is movable in an opening direction counter to a closing force by the pressure generated in the pump work chamber, by means of a first electrically controlled control valve, a communication of the pump work chamber with a diversion chamber is controlled, and by means of a second electrically controlled control valve, the pressure prevailing in a control pressure chamber of the fuel injection valve is controlled, by which the injection valve member is urged at least indirectly in the closing direction.

Abstract: The fuel injection device has a fuel pump, which has a pump piston that is driven by an engine and delimits a pump working chamber, which is supplied with fuel from a fuel tank and is connected to a fuel injection valve, which has an injection valve member that controls at least one injection opening and can be moved by the pressure generated in the pump working chamber in an opening direction counter to a closing force. A first control valve controls a connection of the pump working chamber to a discharge chamber, and a second control valve controls the pressure prevailing in a control pressure chamber of the fuel injection valve. The connection of the pump working chamber further contains a pressure-holding valve, which maintains a pressure that is higher than the pressure prevailing in the discharge chamber.

Abstract: A fuel injection valve with a valve member (10), which cooperates with a valve seat (16) to control injection openings (20). The valve member (10) is guided, in a portion remote from the combustion chamber, in a bore (7) and is surrounded by a pressure chamber (12), which can be filled with fuel at high pressure. The valve member (10) is urged by a spring (27) disposed in a spring chamber (25) and having a closing force in the direction of the valve seat (16), and in an appropriate opening pressure in the pressure chamber (12), as a result of the hydraulic pressure on a pressure shoulder (11), embodied on the valve member (10), the valve member lifts from the valve seat (10) and thus opens the injection openings; the injection of the fuel is effected separately in a main injection and a subsequent postinjection.

Abstract: The invention relates to an arrangement for injecting fuel, which is at high pressure, into an internal combustion engine. An injector (25) encloses a pressure chamber (1), from which a high-pressure line (3) discharges into a control chamber (4) of a nozzle needle (5). Also contained in the injector (25) are two control valves (11, 12), which on the outlet side communicate with regions (9) of a lesser pressure level. One of the control valves (11, 12) that form the injection course (20) contains a pressure compensation system (34), by which the injection pressure course (20) can be varied by varying the stroke length (23) of the nozzle needle (5).

Abstract: The fuel injection apparatus has a high-pressure fuel pump and a fuel injection valve connected to it for each cylinder of the internal combustion engine. A pump piston of the high-pressure fuel pump is set into a stroke motion by the engine and defines a pump working chamber that is connected to a pressure chamber of the fuel injection valve, which has an injection valve member that controls at least one injection opening and can be moved in an opening direction by the pressure prevailing in the pressure chamber, counter to a closing force.

Abstract: A fuel injection device having a fuel pump for each cylinder of an internal combustion engine, which fuel pump has a pump piston that is driven into a stroke motion by the engine and delimits a pump working chamber, which is supplied with fuel from a fuel tank and is connected to a fuel injection valve, which has an injection valve member that controls at least one injection opening and can be moved by the pressure generated in the pump working chamber in an opening direction counter to a closing force. A first electrically controlled control valve controls a connection of the pump working chamber to a discharge chamber, and a second electrically controlled control valve controls the pressure prevailing in a control pressure chamber of the fuel injection valve, which pressure acts on the injection valve member in the closing direction.

Abstract: A fuel injection device having a fuel pump for each cylinder of an internal combustion engine, which fuel pump has a pump piston that is driven into a stroke motion by the engine and delimits a pump working chamber, which is supplied with fuel from a fuel tank and is connected to a fuel injection valve, which has an injection valve member that controls at least one injection opening and can be moved by the pressure generated in the pump working chamber in an opening direction counter to a closing force. A first electrically controlled control valve controls a connection of the pump working chamber to a discharge chamber, and a second electrically controlled control valve controls the pressure prevailing in a control pressure chamber of the fuel injection valve, which pressure acts on the injection valve member in the closing direction.

Abstract: The fuel injection device has a fuel pump for each cylinder of the engine, which fuel pump has a pump piston that is driven into a stroke motion by the engine and delimits a pump working chamber, which is supplied with fuel from a fuel tank and is connected to a fuel injection valve, which has an injection valve member that controls at least one injection opening and can be moved by the pressure generated in the pump working chamber in an opening direction counter to a closing force. A first electrically controlled control valve controls a connection of the pump working chamber to a discharge chamber, and a second electrically controlled control valve controls the pressure prevailing in a control pressure chamber of the fuel injection valve, which pressure acts at least indirectly on the injection valve member in the closing direction.

Abstract: The invention relates to a method for shaping the injection pressure course (27) in injectors, which are used for instance in injection devices of injection systems in motor vehicles. The injection device includes a pump part (1) and an injection nozzle part (2). The pump part (1) and injection nozzle part (2) communicate with one another via a high-pressure line (3). Control valves (8, 10) which are triggered by means of an actuator (9) are contained in the pump part (1). By the triggering by means of the actuator (9), injection parameters during the preinjection phase (28), pressure buildup phase (29) and main injection phase (30) are determined.

Abstract: The fuel injection apparatus has one fuel pump or each cylinder of the engine, which pump has a pump piston, driven by the engine in a reciprocating motion, that defines a pump work chamber, which communicates via a line with a fuel injection valve, disposed on the engine separately from the fuel pump, which valve has an injection valve member, by which at least one injection opening is controlled, and which is movable in the opening direction, counter to a closing force, by the pressure generated in the pump work chamber; a first electrically triggered control valve is provided, by which a communication of the line with a relief chamber is controlled. A second electrically triggered control valve is provided, which is disposed near the fuel injection valve and by which the pressure prevailing in a control pressure chamber of the fuel injection valve is controlled, by which pressure the injection valve member is urged at least indirectly in the closing direction.

Abstract: The invention relates to a device for injecting fuel, having an injector (1) that contains a pressure chamber (13). From the pressure chamber (13), a high-pressure line (5) extends through the injector housing (2), in which a nozzle (3) is disposed that can be closed by means of a nozzle needle (4); the nozzle needle (4) is acted upon by means of a force storing means (7). Via an actuator element (11), control valves (8, 10) that are adjustable and triggerable independently of one another are provided, which communicate with one another via a coupling chamber and by way of which the injection pressure course (24) can be controlled.

Abstract: The fuel injection apparatus has one fuel pump for each cylinder of the engine, which pump has a pump piston, driven by the engine in a reciprocating motion, that defines a pump work chamber, which communicates via a line with a fuel injection valve, disposed on the engine separately from the fuel pump, which valve has an injection valve member, by which at least one injection opening is controlled, and which is movable in the opening direction, counter to a closing force, by the pressure generated in the pump work chamber, and at least one first electrically triggered control valve is provided, by which a communication of the pump work chamber with a relief chamber is controlled, and which is disposed near the fuel pump.