Trw Limited

Trw Automotive U.S. LLC

Hemant Sardar

Abbas Ahmad Fardoun

Joseph D Miller

James C Loria

An electrically assisted power steering system includes an anti-theft feature. Upon detection of an event that is indicative of a vehicle theft situation, the drive circuit for the electric assist motor is selectively actuated to excite the motor windings to either prevent or oppose movement of the steering system.

Electrically assisted power steering system with anti-theft capability

A motor current controller for a permanent magnet AC motor achieves a decrease in bandwidth variations that would otherwise be caused by temperature changes. The current controller dynamically modifies the integral gain of a proportional-integral regulator in response to temperature-induced changes in motor resistance. The integral gain value is calculated to maintain a substantially constant loop bandwidth within a current loop primarily comprising the permanent magnet AC motor, semiconductor switches connected in an H-bridge configuration, and the proportional-integral regulator.

Dynamic tuning of current loop controller for a permanent magnet brushless motor

A method and apparatus for determining a motor fault in an electric motor ( ) determines a calculated rotor position (&thgr; ) of the electric motor. The calculated rotor position (&thgr; ) is compared to a measured rotor position (&thgr; ) of the electric motor ( ) to determine a rotor position error (&thgr; ). A motor fault in the electric motor ( ) is determined when the rotor position error (&thgr; ) exceeds a predetermined maximum rotor position error (&thgr; ).

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Farmington Hills, MI, United States of America

Hemant Sardar