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:
Nov. 25, 2003
Filed:
Oct. 20, 2001
Rakan C. Chabaan, Farmington Hills, MI (US);
Ford Global Technologies, LLC, Dearborn, MI (US);
Abstract
A steering system ( ) and method ( ) for controlling the steering of a vehicle having a steering assembly including a steering wheel ( ), a steering column ( ) connected to said steering wheel ( ), and an electric motor ( ) operatively engaged with the steering assembly for supplying torque assist. A steering angle sensor ( ) is employed for sensing an angular position &thgr; of the steering column ( ). The steering system has first and second H-infinity controllers ( A and B) coupled in a feedback path ( ) for generating first and second feedback signals as a function of the driver torque and first and second characteristics (J and K ) of the steering system. One of the first and second feedback signals is selected and the selected feedback signal is combined with a feedforward signal to generate a motor control signal (U) as a function of the estimated torque.