Robert Boschgmbh

Daimler Chrysler Ag

Tobias Flaemig-Vetter

Klaus Joos

Markus Amler

Thomas Frenz

Gregor Renner

Claus Schneider

Uwe Schaupp

Bernd Kudicke

Heinz Oeing

A piezoelectric actuator for media flowing around it having a piezo stack which is arranged within a deformable isolating material so as to be in direct contact therewith at least over certain regions. The isolating material is for its part enclosed by a fluidically closed actuator housing, which is formed by a housing shell which is delimited at its one end by a dimensionally stable actuator top and at its other end by a dimensionally stable actuator bottom. The actuator top and bottom are arranged on the active main surfaces of the piezo stack. To increase the service life, the housing shell is produced from a limp and/or elastic material and is disposed at a distance from the piezo stack. The length of the housing shell, measured along the surface line, corresponds at least to the maximum extent of the piezo stack and/or the housing shell can be stretched accordingly.

Piezoelectric actuator for media flowing therearound and use of a corresponding piezoelectric actuator

Method for operating an internal combustion engine in which fuel is injected into a combustion chamber by an injector. The injector has a drivable piezo-actuator. A setpoint value is generated for driving the piezo-actuator. A setpoint charge quantity (QC) is determined from the setpoint value, and an actual charge quantity (QC) supplied to the piezo-actuator is determined. The setpoint charge quantity (QC) and the actual charge quantity (QC) are combined, and the combined result (S) acts upon the drive circuit of the piezo-actuator.

Method, computer program, memory medium and control and/or regulating unit for operating an internal combustion engine, as well as internal combustion engine, in particular for a motor vehicle

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Esslingen, Germany

Tobias Flaemig-Vetter