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. 26, 2001
Filed:
May. 12, 1999
Applicant:
Inventors:
Yoshinobu Shimizu, Sakai, JP;
Hirofumi Matsuoka, Kyoto, JP;
Assignee:
Koyo Seiko Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B62D 5/06 ;
U.S. Cl.
CPC ...
B62D 5/06 ;
Abstract
A power steering apparatus is provided, which is adapted to generate a steering assist force by a hydraulic pressure of a pump driven by an electric motor. The apparatus includes: a pulse width modulation control circuit for controlling the electric motor through a pulse width modulation control; a load detection circuit for detecting a load applied on the electric motor; and a control circuit for progressively increasing the PWM duty of the pulse width modulation control circuit up to 100% if the load on the electric motor is not lower than a predetermined level.