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:
Nov. 27, 2007
Filed:
Aug. 18, 2005
Gabriel Marzahn, Lappersdorf, DE;
Gabriel Marzahn, Lappersdorf, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A piezoelectric actuator, for instance a piezoelement for driving an injection valve of an internal combustion engine, is discharged from a charge state, in which a first control potential is present on a first piezo-terminal and a second control potential is present on a second piezo-terminal. The discharging operation is accelerated by not only changing the potential prevailing on the first piezo-terminal toward the second control potential by way of a first discharge path, but a second discharge path is also formed between the second piezo-terminal and a potential lying between the two control potentials. By appropriate selection of the time sequence in connecting these two discharge paths and of their electrical properties, discontinuities in the discharge process can be almost completely avoided. The discharge process then proceeds very rapidly and evenly.