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:
May. 12, 2009
Filed:
Aug. 16, 2005
Farhad Bolourchi, Novi, MI (US);
Michael J. Augustine, Mayville, MI (US);
Brian J. Magnus, Frankenmuth, MI (US);
Jon D. Demerly, Byron, MI (US);
Sanket S. Amberkar, Ann Arbor, MI (US);
Suat A. Ozsoylu, Rochester Hills, MI (US);
James Card, Lighthouse Point, FL (US);
Karen Boswell, Freeland, MI (US);
Farhad Bolourchi, Novi, MI (US);
Michael J. Augustine, Mayville, MI (US);
Brian J. Magnus, Frankenmuth, MI (US);
Jon D. Demerly, Byron, MI (US);
Sanket S. Amberkar, Ann Arbor, MI (US);
Suat A. Ozsoylu, Rochester Hills, MI (US);
James Card, Lighthouse Point, FL (US);
Karen Boswell, Freeland, MI (US);
Delphi Technologies, Inc., Troy, MI (US);
Abstract
A steering system with reduced coupling between a position overlay unit and a torque overlay unit may include a remote valve assembly for controlling a hydraulic assist force or an electric motor for providing torque overlay and electric assist to a rack of a rack and pinion steering system. In one embodiment, the position overlay unit may provide the assist force and the torque overlay unit may provide a motor command signal to the motor of a differential positioned on a steering shaft. In another embodiment, the position overlay unit may provide the motor command signal and the torque overlay unit may provide the assist force. In either embodiment, the position overlay unit may include variable ratio gain that uses a position signal to output a variable ratio command.