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:
Jan. 16, 2007
Filed:
Oct. 29, 2004
Tetsunao Takaki, Tokyo, JP;
Masayasu Miyajima, Tokyo, JP;
Toshinori Tanaka, Tokyo, JP;
Kiyohide Okamoto, Tokyo, JP;
Tetsunao Takaki, Tokyo, JP;
Masayasu Miyajima, Tokyo, JP;
Toshinori Tanaka, Tokyo, JP;
Kiyohide Okamoto, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A vehicle electro-hydraulic power steering unit includes: a steering mechanism steering a steering wheel in a steering direction; an electro-hydraulic pump; a piston mechanism assisting the steering mechanism in a steering direction; a hydraulic circuit causing an assist force to be generated in response to the steering of the steering mechanism; and a control unit controlling a motor based on an output signal from a vehicle speed sensor, a torque sensor, and a steering angle sensor. In this power steering unit, driving the motor is started when a steering torque exceeds a set torque threshold, and the torque threshold to be set is changed depending on operating conditions. Thus, a vehicle electro-hydraulic power steering unit improved in fuel consumption is obtained.