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:
Jul. 24, 2001
Filed:
Sep. 29, 1998
Applicant:
Inventors:
Russell Wilson-Jones, Stratford-upon-Avon, GB;
Steven J Horton, Solihull, GB;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A01B 6/900 ; B62D 1/100 ; B62D 5/04 ; G05D 1/00 ;
U.S. Cl.
CPC ...
A01B 6/900 ; B62D 1/100 ; B62D 5/04 ; G05D 1/00 ;
Abstract
A controller for an electric power assisted steering system comprises a drive circuit (,) for controlling current to a motor (,) and a data processor (,) for controlling the motor current and hence assistance torque. A circuit (,) generates a current limit which is a monotonically decreasing function of vehicle speed. A comparator (,) compares motor current with the current limit and switches off the drive circuit (,) if the current limit is exceeded.