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:
Oct. 14, 2014
Filed:
May. 12, 2011
Abraham Gebregergis, Saginaw, MI (US);
Paul Fisher, Saginaw, MI (US);
Christian E. Ross, Hemlock, MI (US);
Abraham Gebregergis, Saginaw, MI (US);
Paul Fisher, Saginaw, MI (US);
Christian E. Ross, Hemlock, MI (US);
Steering Solutions IP Holding Corporation, Saginaw, MI (US);
Abstract
A system and a method for determining an absolute position of a motor shaft in an electric power steering system during an ignition off state are provided. The system includes a microprocessor that energizes first and second position sensors to generate first and second signals, respectively, at a first time, and third and fourth signals, respectively, at a second time. The microprocessor determines a first relative position value based on the first and second signals, and a second relative position value based on the third and fourth signals. The microprocessor determines an amount of relative rotation of the shaft during the ignition off state based on the first and second relative position values, and determines a current absolute position value based on a previously stored absolute position value and the amount of relative rotation of the rotatable shaft.