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:
Feb. 17, 2004
Filed:
Nov. 05, 2002
Atsushi Ishihara, Gifu, JP;
Koyo Seiko Co., Ltd., Osaka, JP;
Abstract
An electric power steering apparatus for assisting steering by conferring torque generated by an electric motor to a steering mechanism. The apparatus includes: a correction table created based on a result of actual measurement of torque ripple occurring when a predetermined reference current is supplied to the electric motor; a basic command value setting portion for setting a basic command value according to a steering manipulation of a driver; a current command value setting portion for setting a current command value by correcting the basic command value set by the basic command value setting portion with reference to the correction table; and a motor current control portion for controlling a current to be supplied to the electric motor based on the current command value set by the current command value setting portion.