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:
Jun. 24, 2008
Filed:
Jun. 03, 2005
Yasuhiko Miyaura, Gunma, JP;
Yasuhiko Miyaura, Gunma, JP;
NSK Ltd., Tokyo, JP;
NSK Steering Systems Co., Ltd., Tokyo, JP;
Abstract
An electric power steering apparatus controlling an operation of an electric motor by a control unit based on a torque signal from a torque sensor and executing a steering assist of a steering shaft via a reduction mechanism. The control unit includes a power supply voltage detector for detecting a power supply voltage signal of an in-vehicle power supply, and an output inhibitor for inhibiting an output in multiple stages based on a power supply voltage detected by the detector. A maximum driving current of the motor is limited when the voltage is decreased by the inhibitor to reach a first reference value (V), a motor control output gain is decreased when the voltage reaches a second reference value (V), and the output is turned off when the voltage reaches a third reference value (V).