Abstract: The invention relates to an injection device (1), designed in particular for injecting fluid into an exhaust tract of an internal combustion engine, having a valve needle (14), an injection chamber (12) having at least one injection opening (44), and a control chamber (20). The injection device (1) is designed such that a pressure differential between the injection chamber (12) and the control chamber (20) brings about a displacement of the valve needle (14) between an open position in which a fluid flow through the injection opening (44) from the injection chamber (12) is released, and a closed position, in which the injection opening (44) is closed off.

Abstract: The invention relates to an injection device, in particular for injecting fluid into an exhaust tract of an internal combustion engine, having a valve unit which comprises a valve needle, an injection chamber having at least one injection opening, and a control chamber, wherein the injection device is designed so that a pressure differential between the injection chamber and the control chamber brings about a displacement of the valve needle between an open position in which the valve needle releases a fluid flow through the injection opening, and a closed position in which the valve needle closes off the injection opening. The injection device also has a pump unit integrated in the injection device. The pump unit is designed so as to draw in fluid from the fluid inlet during operation and to provide said fluid to the valve unit under increased pressure.

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 an injection device (1), designed in particular for injecting fluid into an exhaust tract of an internal combustion engine, having a valve needle (14), an injection chamber (12) having at least one injection opening (44), and a control chamber (20). The injection device (1) is designed such that a pressure differential between the injection chamber (12) and the control chamber (20) brings about a displacement of the valve needle (14) between an open position in which a fluid flow through the injection opening (44) from the injection chamber (12) is released, and a closed position, in which the injection opening (44) is closed off.

Abstract: The invention relates to an injection device (2), in particular for injecting fluid into an exhaust tract of an internal combustion engine, having a valve unit which comprises a valve needle (6), an injection chamber (38) having at least one injection opening (8), and a control chamber (36), wherein the injection device (2) is designed so that a pressure differential between the injection chamber (38) and the control chamber (36) brings about a displacement of the valve needle (6) between an open position in which the valve needle (6) releases a fluid flow (through the injection opening (8), and a closed position in which the valve needle (6) closes off the injection opening (8). The injection device (2) also has a pump unit integrated in the injection device (2). The pump unit is designed so as to draw in fluid from the fluid inlet (32) during operation and to provide said fluid to the valve unit under increased pressure.

Abstract: A fuel injection apparatus has a high-pressure pump and a fuel-supply pump that delivers fuel from a fuel tank to the high-pressure pump. The high-pressure pump has a housing with an internal chamber that contains a drive unit for at least one pump element having a pump piston driven by the drive unit and delimiting a pump working chamber into which fuel is supplied via an inlet during an intake stroke and from which fuel is displaced via an outlet into the reservoir during a delivery stroke of the pump piston. The fuel-supply pump delivers fuel into the internal chamber via a connection that contains a check valve which opens toward the internal chamber of the housing and the inlet of the pump working chamber is connected to the internal chamber.

Abstract: A fuel injection system having one high-pressure fuel pump and one fuel injection valve, communicating with the high-pressure fuel pump, for each cylinder of an internal combustion engine. A pump work chamber is defined by a pump piston, and the fuel injection valve has an injection valve member by which at least one injection opening is controlled. An electrically actuated control valve controls a communication of the pump work chamber with a relief region and a movable control piston acts at least indirectly in the closing direction on the injection valve member, and the control piston, on its side remote from the at least one injection valve member, is acted upon at least indirectly by the pressure prevailing in the pump work chamber. The control piston, with its side toward the injection valve member, defines a control chamber.

Abstract: A high-pressure pump having a rotationally driven drive shaft and at least one pump element which has a pump piston driven at least indirectly in a reciprocating motion by the drive shaft which piston is guided in a cylinder bore and with its end remote from the drive shaft defines a pump work chamber. The pump piston is braced at least indirectly on the drive shaft. Extending through the pump piston is at least one line which discharges at the circumference of the pump piston in the cylinder bore spaced apart from the end of the pump piston that defines the pump work chamber and which leads toward the drive shaft to the region where the pump piston is braced.

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: The invention relates to a fuel injection device for an internal combustion engine having a housing, a first valve element, which has a first hydraulic control surface acting in the closing direction at least one second valve element, which has a second hydraulic control surface acting in the closing direction. Each valve element is associated with its own hydraulic control chamber, which can be connected to a shared high-pressure connection and is at least partially delimited by a respective hydraulic control surface. There is a fluid connection between the control chambers. The fuel injection device includes a valve device that can disconnect the fluid connection.

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 high-pressure pump having a rotationally driven drive shaft and at least one pump element which has a pump piston driven at least indirectly in a reciprocating motion by the drive shaft which piston is guided in a cylinder bore and with its end remote from the drive shaft defines a pump work chamber. The pump piston is braced at least indirectly on the drive shaft. Extending through the pump piston is at least one line which discharges at the circumference of the pump piston in the cylinder bore spaced apart from the end of the pump piston that defines the pump work chamber and which leads toward the drive shaft to the region where the pump piston is braced.

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 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 valve in which a pistonlike outer valve needle is disposed longitudinally displaceably in a bore and cooperates with a valve seat to control at least one injection opening. A control chamber regulatable by a valve is provided and pressure in the control chamber exerts a closing force at least indirectly on the outer valve needle in the direction of the valve seat. A pressure face embodied on the outer valve needle is acted upon by the pressure in a pressure chamber, which is embodied between the outer valve needle and the wall of the bore and extends as far as the valve seat, so that an opening force on the outer valve needle results that is oriented counter to the closing force. An inner valve needle is guided in the outer valve needle and controls at least one additional injection opening and is acted upon by the pressure in the control chamber at least indirectly in the direction of the valve seat.

Abstract: A fuel injection system having one high-pressure fuel pump and one fuel injection valve, communicating with the high-pressure fuel pump, for each cylinder of an internal combustion engine. A pump work chamber is defined by a pump piston, and the fuel injection valve has an injection valve member by which at least one injection opening is controlled. An electrically actuated control valve controls a communication of the pump work chamber with a relief region and a movable control piston acts at least indirectly in the closing direction on the injection valve member, and the control piston, on its side remote from the at least one injection valve member, is acted upon at least indirectly by the pressure prevailing in the pump work chamber. The control piston, with its side toward the injection valve member, defines a control chamber.