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:
Dec. 11, 1990
Filed:
Aug. 28, 1989
Applicant:
Inventors:
Hirofumi Matsuoka, Osaka, JP;
Hidetoshi Tabuse, Osaka, JP;
Assignee:
Koyo Seiko Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B62D / ;
U.S. Cl.
CPC ...
36442405 ; 180 791 ; 180142 ;
Abstract
The motor-driven power steering control apparatus of the invention detects overload of a motor according to the calculation of coil resistance and temperature detection based thereon. The coil resistance is calculated according to terminal voltage or effective voltage based on duty ratio, and counter-electromotive force, and the driving current. Thereby overload of the motor can be detected without delay.