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. 15, 2003
Filed:
Mar. 23, 2001
Hirofumi Matsuoka, Kyoto, JP;
Koyo Seiko Co., Ltd., Osaka, JP;
Abstract
An electric power steering apparatus comprising a torque detector for detecting a steering torque applied to a steering wheel (not shown) and a steering assist motor which is driven under control based on a drive current corresponding to the steering torque detected by the torque detector . By further comprising an angle detector for detecting a turn angle of the steering wheel, angular velocity calculating means for calculating an angular velocity of turn of the steering wheel from the turn angle detected by the angle detector , friction compensating unit for calculating an angular acceleration of turn of the steering wheel for friction compensation from the angular velocity of turn calculated by the angular velocity calculating means and adding means for adding a current related to the angular velocity of turn and a current related to the angular acceleration of turn calculated by the friction compensating unit to the drive current, friction compensation is performed at the start of steering, more accurate friction compensation of a steering system is carried out, and an electric power steering apparatus having a good feel of steering is achieved.