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. 02, 1996
Filed:
Jul. 25, 1994
Applicant:
Inventors:
Assignee:
Koyo Seiko Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B62D / ;
U.S. Cl.
CPC ...
180 791 ; 36442405 ;
Abstract
In an electric power steering apparatus, in which an electric motor for assisting the steering torque is adapted to be driven by PWM wave, and the duty of the PWM wave is adapted to be under the feedback control in time series by detecting the driving current of the motor, when the direction of the target current in this time for the feedback control is different from that of the former time, or when the detected driving current in the motor is zero, the former target voltage of the motor for the feedback control is forcibly set to the voltage value decided in reference to the minimum duty of the PWM wave for driving the motor.