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:
Mar. 20, 1990
Filed:
Mar. 09, 1989
Toyohiko Mouri, Tokyo, JP;
Saiichiro Oshita, Tokyo, JP;
Tsutomu Takahashi, Tokyo, JP;
Mitsunori Ishii, Tokyo, JP;
Fuji Jukogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A hydraulic power steering system is disclosed which has a steering control valve operatively connected to a steering shaft to be actuated by the torsional torque exerted thereon by a steering wheel, and a hydraulic cylinder operated by the control valve for assisting the steering of the vehicle. An electric motor drive unit is coupled to the steering shaft for exerting torque thereto in a direction for returning the steering wheel to a straight ahead position. An electronic control circuit is connected to the motor drive unit for exerting a variable amount of return torque to the steering shaft according to the steering angle of the steering shaft, or to both the steering angle and the travelling speed of the vehicle.