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. 10, 2002
Filed:
Jul. 28, 2000
Joseph D. Miller, Farmington Hills, MI (US);
Kevin M. McLaughlin, Troy, MI (US);
TRW Inc., Lyndhurst, OH (US);
Abstract
An electric assist steering system ( ) includes a torque sensor ( ) that provides an applied torque signal ( ) indicative of applied steering torque. A motor position sensor ( ) provides a motor position signal ( ) indicative of the relative position between the rotor and the stator of an AC permanent magnet electric assist motor ( ). A first controller ( ) controls energization of the electric assist motor and a second controller ( ) calculates a DQ vector value in response to applied steering torque and motor position. The second controller ( ) also transforms the monitored motor current and position into DQ values. The second controller ( ) compares the DQ values responsive to applied steering torque with the DQ value from monitored motor current and position. The electric assist motor ( ) is disabled if the comparison indicates inconsistent results.