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:
Aug. 24, 2004
Filed:
Jul. 02, 2003
Yuki Matsuoka, Nara, JP;
Mitsuhiko Nishimoto, Nara, JP;
Koyo Seiko Co., Ltd., Osaka, JP;
Abstract
The present invention provides an electric power steering device. The ECU of the device includes a microcomputer; a PWM signal generating circuit for generating a PWM signal according to the command value; a motor drive circuit for impressing a voltage corresponding to the PWM signal upon the motor; an electric current detector for detecting an electric current flowing in the motor; an off-set limit value storage circuit for storing the restricting value showing the allowable range of the middle point voltage; a middle point off-set voltage generation circuit for generating a voltage signal of the predetermined restricting voltage in the range of the restricting value when the actually measured middle point voltage stored in the microcomputer as the middle point voltage is compared with the restricting value; and an amplifier for outputting a signal amplified a difference voltage between the signal sent from the torque sensor and the middle point off-set voltage generation circuit.