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. 27, 2016
Filed:
Nov. 15, 2013
Jtekt Corporation, Osaka-shi, Osaka, JP;
Tsutomu Tamura, Nara, JP;
Robert Fuchs, Louveciennes, FR;
JTEKT CORPORATION, Osaka, JP;
Abstract
A friction compensation control unit includes a contact state determination unit that determines the contact state of a speed reducer, a friction coefficient estimation unit that estimates a friction coefficient of a power column, and a frictional force estimation unit that estimates a frictional force generated in the power column. The contact state determination unit determines the contact state of the speed reducer based on a first assist torque command value, a detected steering torque, and an estimated load torque. The friction coefficient estimation unit estimates a friction coefficient of the power column based on an estimated motor angular velocity. The friction force estimation unit computes a second assist torque correction value based on the result of determination made by the contact state determination unit, the friction coefficient, the detected steering torque, the estimated load torque, and the estimated motor angular velocity.