The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 29, 2009
Filed:
Sep. 03, 2003
Georg Bachmaier, München, DE;
Bernhard Fischer, Töging A. Inn, DE;
Bernhard Gottlieb, München, DE;
Andreas Kappel, Brunnthal, DE;
Tim Schwebel, München, DE;
Georg Bachmaier, München, DE;
Bernhard Fischer, Töging A. Inn, DE;
Bernhard Gottlieb, München, DE;
Andreas Kappel, Brunnthal, DE;
Tim Schwebel, München, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
The invention relates to a method and a control unit for operating a hydraulic injection valve, which comprises at least one piezoelectric actuator (), a displaceable component () and a hydraulic element () such as bearing or a transmission system. The use of a drive voltage (U) modifies the length of an actuator (), which makes it possible to control the stroke of the displaceable component (a valve needle). The inventive control unit () produces a polarizing voltage (UB) which pre-stresses the actuator () and whose polarization direction is opposite to the polarization direction of said actuator (). Said invention makes it possible to obtain the greater modification of the length when the actuator () operates in the polarization direction than the drive voltage starts at 0 volts, as it was in practice before. Said invention makes it possible to reduce energy consumption.