Patent · US Active

Device for operating a piezo actuator

US7521838B2 · kind B2 · utility

0Cited by

7References

12Claims

0Family size

Assignee

VDO Automotive AG · DE

Inventors

Dirk Baranowski · Regensburg, DE
Christian Borgmann · Dorsten, DE
Klaus Hengl-Betz · Regensburg, DE
Thorsten Lauer · Burglengenfeld, DE

Key dates

Filing date	Feb 26, 2008
Grant date	Apr 21, 2009
Priority date	—
Expiry date	Feb 26, 2028

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02M51/0603
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A first energy control unit has a pilot controller with an applied setpoint energy and outputs a pilot control signal, and a regulator outputting a regulator signal as a function of the setpoint energy and an actual energy of the piezo actuator. The energy control unit creates a control signal representative for a current threshold of a charge current, depending on the pilot control and regulator signals. Furthermore, there is a second energy control unit for another setpoint energy and another control signal. A power output stage sets a charge current for the piezo actuator as a function of the predetermined control signal and performs this for the predetermined time. A scheduling unit predetermines, for setting the setpoint energy, the control signal and the time to the power output stage, and for setting the another setpoint energy, the another control signal and the time to the another power output stage.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.