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:
Jun. 26, 2001
Filed:
Feb. 16, 2000
Rakan C. Chabaan, Farmington Hills, MI (US);
Le Yi Wang, Novi, MI (US);
Ford Global Technologies, Inc., 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 system has a torque estimator (,) for determining an estimated torque signal (T,est), and an H-infinity controller (,) coupled in a feedback path (,) for generating a feedback signal which is combined with a feedforward signal to generate a motor control signal (U) as a function of the estimated torque. Accordingly, the present invention provides a stable and robust control system, without sacrificing steering performance and desired steering feel.