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:
Aug. 31, 2010
Filed:
Apr. 25, 2008
Chandra S. Namuduri, Troy, MI (US);
Suresh Gopalakrishnan, Farmington Hills, MI (US);
Robert R. Bolio, Clarkston, MI (US);
Ross Feller, Ann Arbor, MI (US);
Balarama V. Murty, West Bloomfield, MI (US);
Chandra S. Namuduri, Troy, MI (US);
Suresh Gopalakrishnan, Farmington Hills, MI (US);
Robert R. Bolio, Clarkston, MI (US);
Ross Feller, Ann Arbor, MI (US);
Balarama V. Murty, West Bloomfield, MI (US);
GM Global Technology Operations, Inc., Detroit, MI (US);
Abstract
A motor control strategy for a motor in a front steering system for a vehicle that reduces vibrations from the motor being transferred to a vehicle hand-wheel. The control strategy also includes operating the electric motor in a commutation freeze mode if a position error signal is less than a first predetermined threshold by sending signals to coils of the motor to prevent to the motor from rotating, operating the electric motor in a commutation normal mode if the position error signal is greater than a second predetermined threshold that is greater than the first predetermined threshold, and operating the electric motor in an angle step mode if the position error signal is between an intermediate threshold and the second threshold where the angle step mode provides a signal to the motor to move the motor forward or backward a predetermined number of motor steps, one step at a time.