Fev Motorentechnik Gmbh & Co Kg

Fev Motorentechnik Gmbh

Fev Motorentechnik Gmbh & Co.

Fev Forschungsgesselschaft Fur Energie-technik Und Verbrennungsmotoren

Fev Motorentechnik Gmbh & Co. Kommanitgesellschaft

Gunter Lothar Gurich

Hermann Josef Laumen

Martin Dusterhoft

Franz Pischinger

Norbert Adolph

Leo Spiegel

Hermann-Josef Laumen

Eugen Schafer

Ralf Weber

Thomas Flecke

Thomas Schladt

Michael Huser

Karl Joachim Schmucker

Norbert Alt

The invention relates to a sensor array for detecting travel of a movable member, especially a positioning element that is movable using an actuator. Said sensor array comprises a stationary coil arrangement () that is provided with an active coil () and at least one passive coil () located a distance therefrom. The coil arrangement () is connected to a power supply unit () and a signal-detecting device (). The inventive sensor array further comprises an axially movable rod-shaped sensor part () that is made of a preferably magnetizable material, is connected to the positioning element which is movable fore and aft in an axial direction, and is provided with at least one short circuit element (). Said at least one short circuit element () is made of an electrically conducting material having low ohmic resistance, is delimited by a final edge () in the longitudinal direction, respectively, and has a dimension in the direction of movement, which is calculated such that one final edge () of the at least one short circuit element () is enclosed by the active coil () in at least one final position (I, II) defined by the predefined length of stroke (h) while another final edge () of the at least one short circuit element () is at least partly embraced by one of the at least one passive coils ().

Sensor array for detecting the movement of a positioning element moved back and forth using an actuator

The invention related to a method for low loss periodic control of a capacitive load (C,), in particular of a piezoelectric actuator. In this method, before load control begins, a capacitor bank (C,) is charged via a voltage source (U,) until the oprating voltage of load (C,) is attained; then the load (C,) is charged from the capacitor bank (C,) via a series resonant circuit formed by a reactance coil (L,), a freewheeling diode (D,), and by the load (C,). In this method, when a load is required, the load (C,) is linked via discharge switch (S,) to the reactance soil (L,) which is itself connected via a freewheeling freewheeling diode (D,) to the capacitor bank (C,) in such a way that the load (C,) is discharged until a residual voltage (U,).

Method for low loss control of a capacitive load, in particular of a piezoelectric actuator

A fluid controlled switching unit includes a valve block; a guide bore provided in the valve block; first and second work chambers provided in the valve block and spaced from one another; first and second cylinder bores provided in the valve body; and a plunger rod guided in the guide bore for reciprocating motion therein along a displacement path. The plunger rod has first and second piston faces situated in the first and second work chambers, respectively, and exposed to fluid pressure prevailing therein. The first and second piston faces move in the first and second cylinder bores, respectively. A valve body is attached to the plunger rod for forming a unitary structure therewith. The valve body has opposite pressure faces as well as first and second opposite end positions determining opposite ends of the displacement path. The valve body, when situated in one of the end positions, is exposed solely unilaterally to fluid pressure at one of the pressure faces thereof. There are further provided a pressurized fluid supply, a depressurized fluid return and a switch-over valve for alternatingly coupling the first and second work chambers to the pressurized fluid supply and the depressurized fluid return for effecting the reciprocating motion.

Fluid controlled switching unit

An actuator assembly for operating a setting member includes an actuator body undergoing a dimensional change upon applying electrical energy thereto; a preliminary pressure chamber for accommodating liquid; a diaphragm sealing the preliminary pressure chamber and being displaceable by the actuator body; a valve member carried by the diaphragm; a transfer chamber for accommodating liquid; and a displaceable plate body disposed in the preliminary pressure chamber and sealingly bounding the transfer chamber. The diaphragm, as it is moved by the actuator body, displaces the plate body. A displaceable piston body sealingly bounds the transfer chamber and has a surface which is smaller than the surface of the plate body, whereby the plate body--with the intermediary of the liquid--displaces the piston body to a greater extent than the displacement of the plate body. The piston body, as it moves, displaces the setting member. A valve opening provided in the plate body is closed or opened by the valve member carried by the diaphragm. In the open position of the valve member, the valve opening establishes a hydraulic communication between the preliminary pressure chamber and the transfer chamber.

Electric solid-body actuator having a hydraulic amplitude magnifier

A fuel injection valve for an internal combustion engine includes a valve block; an injection nozzle carried by the valve block and having a nozzle opening; a valve needle slidable in the injection nozzle for assuming closed and open positions to block and, respectively, to unblock the nozzle opening; a closing spring urging the valve needle into the closed position; and a pressurized fluid port in the valve block. The nozzle opening is in communication with the pressurized fluid port in the open position of the valve needle. A discharge port is defined in the valve block for carrying fluid away therefrom. An equalizing piston, which is slidably disposed in a work chamber in the valve block, is connected with the valve needle. A control plunger is movable in the valve block and has a first position and a second position. In the first position the control plunger prevents communication between the discharge port and the work chamber and maintains communication between the pressurized fluid port and the work chamber for maintaining the equalizing piston and the valve needle in the closed position. In the second position the control plunger prevents communication between the pressurized fluid port and the work chamber and maintains communication between the discharge port and the work chamber for moving the equalizing piston and the valve needle into the open position. A throttle is disposed in the discharge port for braking fluid flow from the work chamber through the discharge port.

Controllable fuel injection valve for an internal-combustion engine

A device for the combined blowoff of fuel and air for direct fuel injection systems in internal combustion engines. The device includes a housing having a fuel connection and an air connection as well as a blowoff aperture connected with both connections and closable by electromagnetically operable valves. A fuel valve is arranged behind an air valve, also opening toward said blowoff side of said blowoff aperture. Both valves are arranged concentrically relative to each other and capable of resting with their valve seats sealing against the housing.

Device for the combined blowoff of fuel and air

A process and a device to measure the compression volume in a cylinder of an internal combustion engine in which process an overpressure in the combustion chamber is produced by introducing a controlled gas flow through existing spark plug or injection nozzle bores. A pressure expansion in the combustion chamber, caused by leakage of the piston rings, is analyzed. The size of leakage is determined by measuring step-by-step varied gas flows, introduced into the chamber and flowing out of the chamber through leakage, and measuring the resulting pressures built up in the chamber at a stationary state of flow and pressure. By combining the leakage characteristic and the pressure expansion characteristic the leaking volume having flowed out of the chamber during the expansion can be determined. With the knowledge of the leaking volume and the pressures and temperatures at the beginning and at the end of the expansion, the compression volume can be calculated with the aid of the general gas equation. In contrast to other known methods, the process makes it possible to determine the compression volume reliably without the need of dismounting the engine or sealing the combustion chamber.

Process and device to measure volume in order to determine the

A pressure transducer for measuring the internal combustion chamber pressure of an internal combustion engine includes a pair of piezoelectric flat plates loaded in shear mode on opposite sides of a central stamp element connected to the plunger of a pressure responsive membrane, pressure distribution elements bearing externally on the piezoelectric plates, abutment elements bearing externally on the pressure distribution elements, and a prestress spring surrounding the abutment elements and applying compressive forces to the distribution elements and for retaining the piezoelectric plates in place. And, the abutment elements are connected to the housing such that the axial force exerted against the stamp element by the pressure to be measured exerts a thrust on both piezoelectric plates which thrust is absorbed by the abutment elements and transferred to an end of the housing confronting the pressure to be measured.

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Aachen, Germany

Gunter Lothar Gurich