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. 14, 2006
Filed:
Aug. 28, 2003
Guang Liu, Lake Zurich, IL (US);
Ronan DE Larminat, Northbrook, IL (US);
Alexander Kurnia, Buffalo Grove, IL (US);
Scott W. Repplinger, Lake Zurich, IL (US);
Guang Liu, Lake Zurich, IL (US);
Ronan De Larminat, Northbrook, IL (US);
Alexander Kurnia, Buffalo Grove, IL (US);
Scott W. Repplinger, Lake Zurich, IL (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A method and system for detecting faults in an electric power-assisted steering system includes determining a voltage vector of an electric power-assisted steering motor and measuring a current vector of the motor. Acceptable angular relationships are defined between the voltage vector and the current vector, which are then compared to find a fault if the angle does not meet the acceptable angular relationship. Additionally, motor direction and position can also be used against an angular check of the voltage and/or current vector. Similarly, torque direction can be used. In this way, several different faults can be determined dynamically under transient conditions.