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:
Sep. 23, 2008
Filed:
Oct. 04, 2006
Stefan Ehrlich, Vienna, AT;
Christian Stöger, Vienna, AT;
Stefan Ehrlich, Vienna, AT;
Christian Stöger, Vienna, AT;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A device for determining the actual reversal of the direction of rotation of a rotational drive continuing to operate after previous switching of the direction of rotation, in particular for window lifting systems or sliding roof drives in a motor vehicle, has a sensor wheel () with a coding structure () configured asymmetrically in respect of distribution along the periphery of the sensor wheel (); a single detector (), which generates a rotor speed-dependent pulse signal during rotation of the sensor wheel () by scanning the coding structure (); and an evaluation unit (), to which the pulse signal is fed and which determines the actual reversal of the direction of rotation by evaluating the pulse edges; wherein the coding structure () is formed by coding sectors () of a first sector width () and a reference coding sector pair () with a second sector width ().