Abstract: The invention relates to a method for identifying a blockage of one or more spray openings of a dosing valve of an SCR catalytic converter system. Said method comprises the closure of the dosing valve, the determination of a first pressure profile in the hydraulic system in the delivery module of the SCR catalytic converter system, and the determination of the stiffness of the hydraulic system from the first pressure profile. The dosing valve is subsequently opened, a second pressure profile in the hydraulic system in the delivery module of the SCR catalytic converter system is determined, and a blockage of one or more spray openings of the dosing valve is determined from the stiffness and from the second pressure profile.

Abstract: The invention relates to a solenoid valve having a magnet assembly and a magnetic top in which a magnetic coil is embedded. The solenoid valve also comprises an armature assembly with an armature bolt and/or armature plate in one or many parts. The armature plate has, according, to the invention, in a radially inner area, a recess that surrounds the area and that defines the height of the remanent air gap.

Abstract: A sheathed element glow plug includes an integrated combustion chamber pressure sensor for a self-igniting internal combustion engine for measuring combustion chamber pressures, in particular for combustion chamber signal-based engine control. The sheathed element glow plug has a heating element and a glow plug housing, as well as a glow plug axis. The glow plug housing has a receptacle area for receiving the heating element, a housing body, and at least one flexibility area situated between the housing body and the receptacle area. At least one force measuring element is installed in the glow plug housing.

Abstract: A fuel injector having a piezoelectric actuator in an injector body and held in contact with the injector body on one side and with a sleevelike booster piston on the other via first spring means. A nozzle body joined to the injector body and a stepped nozzle needle is guided in the body. A second spring disposed inside the booster piston which together with the injection pressure acting on the back side of the nozzle needle keeps the nozzle needle in the closing position. A control chamber on the end toward the nozzle needle of the booster piston communicates, via at least one leakage gap with a fuel supply at injection pressure, and the nozzle needle is urged in the opening direction by the fuel located in the control chamber.

Abstract: A fuel injection systems for direct-injection diesel engines, has a piezoelectric actuator contained in an injector body and acted on by a first spring mechanism so that it remains in contact with the injector body at one end and with a sleeve-like booster piston on the other. A nozzle body connected to the injector body has at least one nozzle outlet opening, and in which a stepped first nozzle needle an axially movable, and a second spring mechanism is contained inside the booster piston and the injection pressure hold the first nozzle needle closed. An outer control chamber communicates via at least one leakage gap with a fuel supply under injection pressure; fuel in the control chamber acts on the first nozzle needle in the opening direction. A large diameter rear region of the first nozzle needle is fitted into the internal chamber of the booster piston.

Abstract: A fuel injection device for an internal combustion engine, having two valve elements each having a hydraulic control surface acting in the closing direction and associated with a hydraulic control chamber. A control valve influences the pressure in the control chamber, and loading devices act on the valve elements in the opening direction. The valve elements react at different hydraulic opening pressures prevailing in the control chamber. The control valve is able to set at least three different pressure levels in the control chamber: all of the valve elements are closed at a comparatively high pressure level; one valve element is open at a medium pressure level; and all of the valve elements are open at a comparatively low pressure level.

Abstract: A method for controlling an injection system of an internal combustion engine having at least one injector, the fuel metering being divided into a first partial injection and at least one second partial injection, and a control signal which determines the fuel quantity to be injected with the aid of the at least one injector being corrected as a function of a pressure wave influencing the at least two partial injections, the pressure wave correction being performed on the basis of a periodic model which models the quantity wave as a sum of periodic functions.

Abstract: A method for controlling an injection system of an internal combustion engine having at least one injector, the fuel metering being divided into a first partial injection and at least one second partial injection, and a control signal which determines the fuel quantity to be injected with the aid of the at least one injector being corrected as a function of a pressure wave influencing the at least two partial injections, the pressure wave correction being performed on the basis of a periodic model which models the quantity wave as a sum of periodic functions.

Abstract: A fuel injection valve for internal combustion engines, having a housing (12; 48) in which a pistonlike valve member (35; 60) is disposed longitudinally displaceably in a bore (34; 57). The valve member (35; 60) is surrounded, over at least part of its length, by a pressure chamber (37; 68), embodied in the housing (12; 48), that can be filled with fuel at high pressure; the valve member (35; 60) controls the communication of the pressure chamber (37; 68) with at least one injection opening (39; 66). The pressure chamber (37; 68) communicates with a damping chamber (46; 80), embodied in the housing (12; 48), via at least one throttle (44; 78) disposed in the housing (12; 48), so that pressure fluctuations that occur in the damping chamber (46; 60) rapidly fade (FIG. 1).

Abstract: A fuel injection device for an internal combustion engine includes a first valve element with a pressure face acting in the opening direction. An actuating device acts in the closing direction. A second valve element has a hydraulic control face, acting in the closing direction, which defines a hydraulic control chamber. A corresponding actuating device acts in the opening direction. A high-pressure connection is provided. The fuel injection device includes an additional valve device, which in a first terminal position connects the pressure chamber only with the low-pressure connection and the control chamber only with the high-pressure connection. In a second terminal position, the additional valve device connects the pressure chamber only with the high-pressure connection and essentially disconnects the control chamber from the high-pressure connection.

Abstract: A fuel injector having a piezoelectric actuator in an injector body and held in contact with the injector body on one side and with a sleevelike booster piston on the other via first spring means. A nozzle body joined to the injector body and a stepped nozzle needle is guided in the body. A second spring disposed inside the booster piston which together with the injection pressure acting on the back side of the nozzle needle keeps the nozzle needle in the closing position. A control chamber on the end toward the nozzle needle of the booster piston communicates, via at least one leakage gap with a fuel supply at injection pressure, and the nozzle needle is urged in the opening direction by the fuel located in the control chamber.

Abstract: A fuel injection device for an internal combustion engine, having two valve elements each having a hydraulic control surface acting in the closing direction and associated with a hydraulic control chamber. A control valve influences the pressure in the control chamber, and loading devices act on the valve elements in the opening direction. The valve elements react at different hydraulic opening pressures prevailing in the control chamber. The control valve is able to set at least three different pressure levels in the control chamber: all of the valve elements are closed at a comparatively high pressure level; one valve element is open at a medium pressure level; and all of the valve elements are open at a comparatively low pressure level.

Abstract: A fuel injection system with a fuel injection valve and a control valve, which control valve has a control valve member that can move longitudinally in a control valve bore. The control valve member is provided with a control valve sealing surface, which cooperates with a control valve seat and thereby controls the connection between a first pressure chamber and a second pressure chamber, where the first pressure chamber is connected to a high-pressure accumulation chamber. A bore is embodied in a valve body and contains a piston-shaped valve needle whose end oriented toward the combustion chamber controls the opening of at least one injection opening by virtue of the fact that it executes a longitudinal movement due to the impingement of the pressure in a pressure chamber; the pressure chamber is connected to the second pressure chamber by means of a supply conduit.

Abstract: A fuel injection system for an internal combustion engine with direct injection includes a fuel injection device which can inject the fuel directly into a combustion chamber of the engine has a valve element bordering on a work chamber, and the position of the valve element depends on the pressure in the work chamber. A pressure booster piston borders on a control chamber on one side and on a high-pressure chamber on the other. A fuel supply can subject the control chamber to various pressures. The pressure booster piston is integrated with the fuel injection device and that the high-pressure chamber is integrated with the work chamber.

Abstract: The invention proposes a fuel injection apparatus with a fuel injection valve, wherein the fuel injection valve has at least one injection opening and at least one valve element for closing the at least one injection opening, wherein the valve element is controlled by means of a servohydraulic valve (131), wherein the servohydraulic valve has a control piston (123) that is supported in moving fashion, wherein the control piston disconnects a control chamber (116) from a high-pressure chamber (120), wherein at least one first partial region (117) of the control chamber (116) can be emptied in every position of the control piston (123) via a line (110) provided with an outlet throttle (113), and wherein at least one second partial region (119) of the control chamber can be filled with fuel in every position of the control piston via an inlet throttle (115) so that depending on the filling of the control chamber (116), in a first position, the control piston (123) disconnects a first connection (125) of the high

Abstract: A fuel injection system for an internal combustion engine with direct injection includes a fuel injection device (16), which can inject the fuel directly into a combustion chamber of the engine, and which has a valve element (70). The valve element borders on a work chamber (79), and the position of the valve element (70) depends on the pressure in the work chamber (79). A pressure booster piston (54) borders on a control chamber (96) on one side and on a high-pressure chamber (76) on the other. A fuel supply can subject the control chamber (96) to various pressures. To improve the emissions performance of an engine equipped with the fuel injection system, it is proposed that the pressure booster piston (54) be integrated with the fuel injection device (16) and that the high-pressure chamber (76) be integrated with the work chamber (79).

Abstract: A fuel injection system, having a fuel injection valve and a control valve, which control valve has a control valve member that is longitudinally displaceable in a control valve bore. A control valve sealing face is embodied on the control valve member; it cooperates with a control valve seat and thus controls the communication between a first pressure space and a second pressure space; the first pressure space communicates with a high-pressure collection chamber. In a valve body, a bore is embodied in which a pistonlike valve needle, with its end toward the combustion chamber, controls the opening of at least one injection opening by executing a longitudinal motion in response to the pressure in a pressure chamber; the pressure chamber communicates with the second pressure space via an inlet conduit.

Abstract: A fuel injection valve for internal combustion engines, having a housing (12; 48) in which a pistonlike valve member (35; 60) is disposed longitudinally displaceably in a bore (34; 57). The valve member (35; 60) is surrounded, over at least part of its length, by a pressure chamber (37; 68), embodied in the housing (12; 48), that can be filled with fuel at high pressure; the valve member (35; 60) controls the communication of the pressure chamber (37; 68) with at least one injection opening (39; 66). The pressure chamber (37; 68) communicates with a damping chamber (46; 80), embodied in the housing (12; 48), via at least one throttle (44; 78) disposed in the housing (12; 48), so that pressure fluctuations that occur in the damping chamber (46; 60) rapidly fade (FIG. 1).

Abstract: A fuel injection valve includes a housing in which a pistonlike valve member is disposed longitudinally displaceably in a bore to cause at least one injection opening to communicate with a pressure chamber embodied in the housing. An inlet conduit discharges into the pressure chamber to fill the pressure chamber with fuel at high pressure. A fuel-filled control chamber in the housing at least indirectly exerts a force acting in the closing direction on the valve member. The control chamber communicates with the inlet conduit and can be made to communicate via a control valve with a leak fuel chamber. A damping chamber communicates with the inlet conduit via a throttle.

Abstract: A fuel injection valve for internal combustion engines, having a housing (12) in which a pistonlike valve member (35) is disposed longitudinally displaceably in a bore (34) and by a longitudinal motion in an opening direction, with its end toward the combustion chamber, causes at least one injection opening (39) to communicate with a pressure chamber (37) embodied in the housing (12). An inlet conduit (14) is embodied in the housing (12) and discharges into the pressure chamber (37), and by way of it the pressure chamber (37) can be filled with fuel at high pressure. A fuel-filled control chamber (20) is also embodied in the housing (12); the pressure in the control chamber (20) at least indirectly exerts a force acting in the closing direction on the valve member (35). The control chamber (20) communicates with the inlet conduit (14) and can be made to communicate via a control valve (16) with a leak fuel chamber (23), in which a markedly lower pressure prevails than in the inlet conduit (14).