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:
Nov. 16, 1999
Filed:
Feb. 21, 1997
Applicant:
Inventors:
Mitsuhiko Nishimoto, Kashihara, JP;
Kazuyuki Yoshida, Sakurai, JP;
Atsushi Igo, Yamatokooriyama, JP;
Assignee:
Koyo Seiko Co., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B62D / ;
U.S. Cl.
CPC ...
180446 ; 180443 ; 701 42 ;
Abstract
An electric power steering apparatus comprising dead zone detecting device for detecting whether a detected value of a steering torque is no more than a predetermined value, that is, in a dead zone or not, steering angular velocity detecting device for detecting the rotation speed of a steering wheel, and motor braking device for braking a motor by short-circuiting the terminals of the motor by the PWM control corresponding to the rotation speed of the steering wheel detected by the steering angular velocity detecting device when the detected value of the steering torque is detected to lie in the dead zone.