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:
Apr. 12, 2005
Filed:
Nov. 08, 2002
Hideki Jonokuchi, Nara, JP;
Yoshiyuki Yamazaki, Nara, JP;
Hideki Jonokuchi, Nara, JP;
Yoshiyuki Yamazaki, Nara, JP;
Koyo Seiko Co., Ltd., Osaka, JP;
Abstract
A microcomputer calculates a command value for feedback control based on a target electric current value set on the basis of steering torque and a vehicle speed, and the detecting value of a motor electric current. The microcomputer calculates the duty ratio of a PWM signal for turning on and off a switching element of a motor driving circuit from this command value. When this calculated duty ratio is 100% or less, no voltage raising circuit is operated and a battery voltage is supplied to the motor driving circuit. In contrast to this, when the calculated duty ratio Dc exceeds 100%, the microcomputer outputs the PWM signal for turning on and off the switching element of the voltage raising circuit in the duty ratio according to this excess amount. Thus, the battery voltage is raised in accordance with this excess amount and is supplied to the motor driving circuit.