Daimler Chrysler Ag

Continental Automotive Gmbh

Stefan Beck

Martin Ebel

Michael Beuschel

Carsten Sensche

Josef Poeppel

Karl Krammel

A piezo valve is actuated by way of at least one actuator which is formed by a piezoelectric bender transducer () having two piezo actuators (). An actuating method has the steps of generating an actuator control signal (out), which can be output at either one of the two piezo actuators (), depending on at least one actuating control signal (in), of detecting an electric measurement quantity at one of the piezo actuators () which is currently not controlled (), and of generating a vibration damping signal (fb) on the basis of the detected measurement quantity and use thereof for active vibration damping for the currently controlled piezo actuator ().

Circuit arrangement and method for actuating a piezo valve

In an electromagnetically actuatable device, an electromagnet is driven with a controlled current progression so that the armature of the electromagnet can be actuated at the lowest possible current level while still achieving the most rapid overall increase of the actuating current from zero to maximum amperage. A first portion or range of the current increase is carried out with a steep or jump-like current increasing characteristic. A second portion or range of the current increase is carried out with a more gradual variation of the current. The current levels at the end points of the respective ranges are selected to ensure that the electromagnet is actuated during the second range in which the current varies more gradually. Preferably, two steep or jump-like current increase ranges are respectively provided before and after the second range having the gradual current increase. The armature of the electromagnet is thereby actuated with the lowest possible energy, and the lowest possible acceleration, so that noise and wear are reduced.

Method and circuit arrangement for reducing noise produced by electromagnetically actuated devices

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Karshuld, Germany

Stefan Beck