Siemens Aktiengesellschaft

Klockner-humboldt-deutz Ag

Kloeckner-humboldt-deutz Ag

Siemens Aktiengesellschaft Ag

Continental Automotive Gmbh

Kloeckner-humboldt-duetz Ag

Reda Rizk

Hans-Gottfried Michels

Wilhelm Frank

Ulrich Augustin

Gerd Schmutzler

Wendelin Klügl

Raimondo Giavi

Martin Neumaier

Stefan Lehmann

Wendelin Kluegl

Guenter Lewentz

Gerhard Finsterwalder

Hans G Michels

Wolfgang Kohler

Gerd Wallenfang

The positioning of the actuating drive in a fuel injector with a piezoactuator () that is screwed into the housing () of the fuel injector is performed by applying a voltage (U) to the piezoactuator () that corresponds to a given idle stroke (h), and the surface grinding of the housing () and base plate () of the piezoactuator () when voltage is applied. Between the housing () of the fuel injector and the housing () of the piezoactuator (), there is also provided a compensation collar () of a suitable thickness.

Procedure for positioning the actuating drive in a fuel injector and device for performing the procedure

The positioning of the actuating drive in a fuel injector with a piezoactor () that is screwed into the housing () of the fuel injector is performed by applying a voltage (U) to the piezoactor () that corresponds to a given idle stroke (h), and the surface grinding of the housing () and base plate () of the piezoactor () when voltage is applied. Between the housing () of the fuel injector and the housing () of the piezoactor (), there is also provided a compensation collar () of a suitable thickness.

Method for producing a compensation collar for an injection valve

The positioning of the actuating drive in a fuel injector with a piezoactor ( ) that is screwed into the housing ( ) of the fuel injector is performed by applying a voltage (U) to the piezoactor ( ) that corresponds to a given idle stroke (h), and the surface grinding of the housing ( ) and base plate ( ) of the piezoactor ( ) when voltage is applied. Between the housing ( ) of the fuel injector and the housing ( ) of the piezoactor ( ), there is also provided a compensation collar ( ) of a suitable thickness.

Method for positioning the actuating drive in a fuel injector device for implementing said method

The apparatus and method of regulating a control valve for a Diesel injection system comprises a fuel injector having a pressure amplifier preceded by the control valve ( ), the slide ( ) of the control valve ( ) being moved by two spatially separated magnet coils ( ). During an electrical triggering of one of the two magnet coils ( ) with a control current, the respective other magnet coil ( ) is switched as a sensor, detecting the current induced in the sensor by a motion of the valve slide ( ).

Arrangement and method for controlling a control valve for a diesel injection system

The regulating member according to the present invention is arranged in a pressure line in a fuel injector with a pressure intensifier and has an actuator, a valve chamber and a spring-loaded valve piston arranged moveably in the valve chamber. The valve piston, in its position of rest, makes a flow connection through the valve chamber between a pressure supply and a control space of the pressure intensifier and, in its switching position, the valve piston makes a flow connection through the valve chamber in which the control space in the pressure intensifier is relieved of pressure.

Regulating member for controlling an intensification of pressure of fuel for a fuel injector

The injection device for a direct-injection internal combustion engine has an actuator and a piston connected to the actuator. A compression chamber connects to a high-pressure line. The device further includes an injection nozzle, a nozzle spring chamber, a nozzle chamber, a fuel supply line, and a pressure-relief valve. The pressure-relief valve draws a constant volume of fuel from the high-pressure line when it closes.

Injection device for a direct-injection internal combustion engine

A configuration for amplifying fuel pressure for a fuel injector includes a pressure amplifier having a control space on a low-pressure side, a working space on a high-pressure side, and a moveable ram disposed between the control and working spaces. The control space is connected to an accumulator through a pressure line, and the working space is connected to a fuel line. The device includes an actuator connected to a servovalve for changing between an actuated switched state and an unactuated initial state. In the pressure line is the servovalve between the pressure supply and the control space, which opens the pressure line in the unactuated initial state, and interrupts the pressure line and keeps unpressurized the control space in the actuated switched state. A method for amplifying the fuel pressure includes: connecting the pressure supply to the pressure amplifier, and to the control space through the pressure line; connecting the working space to an injection nozzle with the fuel line; placing the servovalve in the pressure line between the pressure supply and the control space; connecting the actuator to the servovalve; opening the pressure line with the servovalve when the actuator is unactuated; and interrupting the pressure line and keeping unpressurized the control space with the servovalve upon actuation.

Configuration and method for amplifying the pressure of fuel for a fuel injector

A nozzle needle (,) of a fuel injection valve is guided axially in a nozzle body (,), and it points with its rear end face (,) into a compression chamber (,) and is operatively connected to a damping body (,). The recesses (,) of the damping body (,), together with the damping bore (,), form a fuel-filled damping chamber (,). Upon valve opening, the fuel in the compression chamber is compressed, and thus the valve opening is delayed. If the nozzle needle exceeds the damping stroke (hd), then the fuel is depressurized by a communication with an outflow chamber (,). The damping body is guided over at least part of its length in the damping bore.

Device for delaying the deflection of the nozzle needle of a fuel injection valve

A control valve contains a housing with an inlet connection, an outlet connection and a return connection. A first seat valve with a first valve body and a second seat valve with a second valve body are disposed in the housing. The first seat valve is disposed between the outlet connection and the return connection and is normally closed and the second seat valve is disposed between the inlet connection and the outlet connection and is normally open. The second valve body is disposed coaxially in the first valve body.

Control valve for use in a reservoir injection system for a diesel engine

A fuel injector for diesel engines, having at least one pump plunger (1), which is sealingly guided in a plunger bushing (2) and, together with said bushing, defines a high-pressure space (5). The pump plunger (1) has an internal suction valve (6) which creates a fuel injection pump having a small dead volume in the high-pressure region and low construction cost. The suction valve (6) may be provided with a cone-shaped compression spring (7) disposed in the high-pressure region (5) or with a stroke limiting stop (28, 28a).

Fuel injector

A fuel injection device for diesel engines, having at least one pump plunger (4), which is sealingly guided in a plunger bushing (5) and forms, together with said plunger bushing (5), a high-pressure space (11) that is connected to a low-pressure space (13) by means of a control element during the downward motion of the fuel pump plunger, said high-pressure space (11) being placed in free flow communication with an injection valve (49) via an injection line 48. The use of a continuously open flow connection between the high-pressure space 11 and the injection valve 49 minimizes dead space thereby permitting development of high injection pressures.

Fuel injection device

The fuel injector includes an injection pump element with electromagnetically actuated control valve body supported therein for the control of the beginning of delivery and the quantity delivered. The injection pump element and the control valve are individually replaceable and the control valve body seats without recoil. A control valve (2), which is arranged with clearance in a stepped hole (19) in a plunger bushing (5) is supported in sealing elements (20). The freedom from recoil is achieved by adaptation of a minimum clearance (46) between an anchor plate (30) and an electromagnetic adjusting device (7), the anchor plate (30) being situated in a liquid-filled damping space (33) and the minimum clearance (46) being optimized as a function of the mass of the moving parts of the control valve (2), the spring stiffness of the control valve seat (25), the geometry of an anchor plate (30) and the viscosity of the fuel in the service temperature range.

A control valve for a fuel injector, especially of an air-compressing, spontaneous-ignition, internal combustion engine. The control valve includes a valve body in the form of a piston valve which is axially movable in a housing chamber into a closure position and an open position, with the closure position being determined by a valve seat on the housing, and a seating surface edge on the piston valve. The housing chamber includes at least one high pressure connection, and a low pressure connection. The basic problem with a control valve of this general type is that when the piston valve strikes the valve seat, rebound movements are carried out by the piston valve, so that the closure position can only be reliably assumed after a certain time delay, thus negatively influencing the injection process. In order to avoid these drawbacks, it is possible to have the valve housing chamber, either between its valve seat and the high pressure connection on the one hand, as well as the high-pressure side of the piston valve adjacent the seating surface edge on the other hand, or between its valve seat and the low pressure connection on the one hand as well as the low-pressure side of the piston valve adjacent the seating surface edge, each being provided with a portion having the same diameter. Alternatively, an attenuation mass, especially an attenuation piston element, can be provided on and/or within the piston valve, with this attenuation mass being movable relative to the piston valve.

Control valve for a fuel injector

A control valve for a fuel injector, especially of an air-compressing, spontaneous-ignition, internal combustion engine. The control valve includes a valve body in the form of a piston valve which is axially movable in a housing chamber into a closure position and an open position, with the closure position being determined by a valve seat on the housing, and a seating surface edge on the piston valve. The housing chamber includes at least one high pressure connection, and a low pressure connection. The basic problem with a control valve of this general type is that when the piston valve strikes the valve seat, rebound movements are carried out by the piston valve, so that the closure position can only be reliably assumed after a certain time delay, thus negatively influencing the injection process. In order to avoid these drawbacks, it is possible to have the valve housing chamber, either between its valve seat and the high pressure connection on the one hand, as well as the high-pressure side of the piston valve adjacent the seating surface edge on the other hand, or between its valve seat and the low pressure connection on the one hand as well as the low-pressure side of the piston valve adjacent the seating surface edge, each be provided with a portion having the same diameter. Alternatively, an attenuation mass, especially an attenuation piston element, can be provided on and/or within the piston valve, with this attenuation mass being movable relative to the piston valve.

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Cologne, Germany

Reda Rizk