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. 05, 2006
Filed:
Oct. 07, 2004
Tony Burton, Solihull, GB;
Angel L. Andres Fernandez, Birmingham, GB;
Tony Burton, Solihull, GB;
Angel L. Andres Fernandez, Birmingham, GB;
Abstract
An electric power assisted steering system comprising a steering mechanism which operatively connects a steering wheel to the road wheels of the vehicle, a torque sensing means () adapted to produce a first output signal indicative of the torque carried by a portion of the steering mechanism (), a means () for producing a second output signal indicative of the angular velocity of the steering wheel, a difference means () for determining the difference in value of the torque carried by a portion of the column between two points in time to produce a third output value, an electric motor () operatively connected to the steering mechanism, a signal processing unit () adapted to receive the two signals and to produce a torque demand signal representative of a torque to be applied to the steering mechanism by the motor (), and a motor drive stage adapted to provide a drive current to the motor () responsive to the torque demand signal, and in which the torque demand signal () includes a damping component that is dependent upon both the first output signal, the second output signal and the third output signal.