Siemens Aktiengesellschaft

Continental Automotive Gmbh

Carl Freudenberg Kg

Siemens Aktiengesell Schaft

Siemens Aktiengesellschaft Ag

Hellmut Freudenberg

Christian Hoffmann

Richard Pirkl

Hartmut Gerken

Martin Hecker

Wolfgang Wechler

Matthias Wicke

Carsten Schuh

Manfred Weigl

Jens Dahl Jensen

Randolf Mock

Christoph Hamann

Maximilian H Kronberger

Heiner Bayer

Günter Lugert

Stefan Lehmann

Stefan Kohn

Jürgen Dick

Axel Ganster

Robert Kuchler

Manuel Hannich

Roland Feigl

Erwin Achleitner

Willibald Schürz

Jörg Zapf

Claus Zumstrull

Manfred Wier

Walter Schrod

Martin Simmet

Marcus Unruh

Klaus Wenzlawski

Andreas Voigt

Dirk Baranowski

Georg Brasseur

Wendelin Klügl

Hanspeter Zink

Joachim Frank

Oliver Hennig

Lorand D'Ouvenou

Wolfgang Lingl

Benno Larisch

Anton Mayer-Dick

Detlev Schoppe

Harald Renn

Wolfgang Klitta

Thomas Elbe

Achim Löll

Klaus Egger

G&uuml;nther Riedel

Günter Ziegler

Patrick Delp

Hans-Peter Arnold

Oliver Henning

Stefan Mindl

Robert Schäpers

Hans Peter Arnold

A lever device for a fuel injection valve includes a housing with a housing recess, at least one lever element arranged in the housing recess, a drive element arranged in the housing recess and coupled to the lever element(s) in order to act upon said at least one lever element in a direction of a force-action axis, and an output element arranged in the housing recess and coupled to the lever element(s) such that this output element is moveable in the force-action axis direction by the at least one lever element. Each lever element includes a coupling section designed or arranged such that the lever element is coupled to the housing, or to the output element, in a rotationally-fixed manner with respect to the force-action axis.

Lever device and a fuel injection valve

A drive device for an injection valve may include an actuator configured for exerting a force along a first force action axis, a lever device coupled to the actuator, an output element coupled to the lever device and configured for absorbing a force from the lever device along a second force action axis, wherein the first and second force action axes are arranged offset with respect to one another, and a transmission element arranged between the actuator and the lever device. The transmission element may be coupled to the actuator in a first contact region and to the lever device in a second contact region. The first contact region of the transmission element may be arranged such that it is penetrated by the first force action axis. The second contact region of the transmission element may be arranged such that it is penetrated by the second force action axis.

Drive device for an injection valve, and injection valve

A lever device for a fuel injection valve includes a housing with a housing recess, at least one lever element arranged in the housing recess and having a coupling section coupled to a section of the housing, a drive element arranged in the housing recess and coupled to the at least one lever element to act upon the at least one lever element in the direction of a force-action axis, and an output element arranged in the housing recess and coupled to the at least one lever element such that the output element may be moved in the force-action axis direction by the at least one lever element. The coupling section of the lever element has at least one recess that defines at least two coupling section contact surfaces spaced apart from one another and resting against the housing section.

A method and a device for setting an idle stroke of an actuating drive of an injection valve with respect to an actuating element actuated by the actuating drive. The actuating drive is arranged in an injector body and the actuating element is arranged in an actuating-element housing such that it is movable in an axial. An axial stressing force is applied to the injector body and the actuating-element housing such that part of the injector body or actuating-element housing arranged in a force flow path defined the axial stressing force is deformed permanently, until a value of a representative electric variable determined directly or indirectly for the idle stroke of the actuating drive lies in a predefined value range. Further, an injector assembly for an injection valve may include an injector body and/or an actuating-element housing having a contact section elevated in the axial direction.

Method and device for setting an idle stroke of an actuating drive of an injection valve, and injector assembly

In an actuator unit for an injection system of an internal combustion engine, the difference in the longitudinal extension when a change of temperature of the piezoelectric actuator element occurs affecting the actuator unit is equalized compared to the actuator housing due to different thermal expansion coefficient values in that a fastening element is arranged on the actuator housing. The fastening element is made of a different material than the actuator housing and thus affects a force acting counter to the change of length of the actuator housing.

Actuator unit for an injection system of an internal combustion engine

In a method for the production of a gradient encapsulation layeron a piezoelectric actuator, based on this gradient encapsulation layer, the piezoelectric actuatordoes notrequire an additional housing-like enveloping structure in order to be protected externally. The gradient encapsulation layeris produced by cold gas spraying of particles having different material properties.

Piezoelectric actuator with encapsulation layer having a thickness-varying property gradient

In a method for producing a multilayer encapsulation () of a piezo actuator () such that the piezo actuator () is protected towards the outside without having to use an additional enveloping housing-type structure, in order to produce the multilayer encapsulation (), an electrically insulating elastic layer () is first applied to the surface of the piezo actuator (), whereupon a metallic layer is applied to the electrically insulating elastic layer () so as to planarly cover the same.

Piezo actuator comprising a multilayer encapsulation, and method for the production thereof

A transfer device for transferring an actuator displacement, has a housing with a first recess having a first and second plunger displaceably mounted. These plungers are actively connected via at least one transfer chamber by a fluid. The active connection causes the second plunger to be displaced when the first plunger is moved and vice versa. The transfer chamber is hydraulically coupled via a sealing gap to a compensating chamber compensating the pressure differences, in a delayed manner. The transfer device also has a chamber device with a compensating chamber, a chamber housing, and a first plunger. The chamber device has a device with a first body with a recess including a second body, and with an elastomer placed in the recess between the first and second body. The elastomer has a first groove extending at least partially along the recess.

Device, method for producing the device, chamber device and transfer device

An injector has a valve pin whose position is adjustable according to the pressure prevailing in a control chamber and which blocks a fluid flow through at least one injection port in a closed position. The injector has a control chamber that is hydraulically coupled to a high-pressure fluid reservoir, a piezo actuator, and a control valve which hydraulically connects and disconnects the control chamber, the piezo actuator acting upon said control valve. A combination of a triggering period for the piezo actuator and electric power that is to be fed to the piezo actuator is varied from a predefined initial combination to a target combination in which a pressure curve is detected that is characteristic of a movement of the control valve out of the closed position thereof without fluid being proportioned through the injection port.

Method and device for controllling an injector

The current guided to the piezo actuator and the voltage which is consequently established thereon is used for calculating with the help of a non-linear actuator model, the characteristics of the longitudinal variations (s) and the force (F) exerted by the actuator (F), and variables therefrom or the derived variables (dF/dt) therefrom determine the beginning of the opening (tA) of a servovalve and the duration of injection (D).

Method for controlling a piezo-actuated fuel-injection valve

A device with a piezoelectric actuator () comprises two faces () and two electroconductive contact paths (), each traversing the actuator () starting from at least one face (). The actuator is clamped between two metallic plates (), each arranged against a face (). The piezoelectric actuator further comprises an electroinsulating layer () arranged between each face) and the corresponding metallic plate ().

Device with a piezoelectric actuator

In a driving operation, a capacitive actuator is charged from a series circuit of two capacitors having a charging voltage. An actuator voltage established at the actuator is controlled to a prescribed desired value in a course of a subsequent driving operation; the same procedure occurs for further actuators.

Method and device for driving at least one capacitive actuator

Method of driving a capacitive actuator of a fuel injection valve of an internal combustion engine for achieving a constant stroke of the actuator, in which the amounts of energy that are supplied to the actuator are determined in dependence on the fuel pressure acting on the actuator.

Method of driving a capacitive actuator of a fuel injection valve of an internal combustion engine

A method for controlling a capacitive actuator includes the steps of determining an energy applied to an actuator, measuring an actuator voltage present at the actuator, and inferring a functional state of the actuator by using the energy and the actuator voltage. A capacitive actuator is fed energy and the actuator voltage present at the actuator is measured. The energy and the comparison of the actuator voltage with reference values are used to infer a functional state, for example, either faults or correct function of the actuator or injection valve. Furthermore, the actuator voltage is used to infer an actuator stroke. The method is based on actuator characteristics. The invention also includes a circuit for controlling a capacitive actuator having a driving circuit with a main switch, a charging capacitor, a first series circuit including an oscillating coil, an auxiliary switch, and a second series circuit having a discharging switch, a charging switch, and a diode to be connected to the actuator, and a control device having a program and a family of characteristics with actuator characteristics defining characteristic curves, reference values, and correction factors.

Method and apparatus for controlling a capacitive actuator

A control element, in particular a piezoelectrically operated fuel injection valve in an internal combustion engine, is charged, in order to compensate for stochastic reactions in the internal combustion engine, with a constant nominal voltage applied to a series circuit that includes a charge capacitor and a charge reversal capacitor, and it is discharged into the charge reversal capacitor to a prescribed voltage value. The remaining residual charge of the control element is charged into the charge capacitor via a limiter path.

Method and apparatus for driving at least one capacitive control element

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Grossberg, Germany

Hellmut Freudenberg