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:
Mar. 27, 2012
Filed:
Mar. 05, 2007
Oliver Lehner, Beratzhausen, DE;
Michael Robl, Ingolstadt, DE;
Oliver Lehner, Beratzhausen, DE;
Michael Robl, Ingolstadt, DE;
Continental Automotive GmbH, Hannover, DE;
Abstract
A control unit has a closed-loop controller which is connected to a regulating electrovalve by way of a feedback branch, forming a closed-loop control circuit, in order to regulate the electrical coil current of the regulating electrovalve. The armature of the electrovalve is used to adjust a desired volume flow in a motor vehicle hydraulic device. The armature of the regulating electrovalve is continuously subjected to an armature oscillation in order to reduce the static friction and/or magnetic hysteresis. Inside the closed-loop controller of the closed-loop control circuit itself, the nominal current, which is supplied to the closed-loop controller on the input side as a command variable, is subjected to a dither signal generated inside the closed-loop controller for producing the armature oscillation, essentially synchronously to the clock cycle of the closed-loop controller.