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. 07, 1986
Filed:
Nov. 13, 1984
Mitsuharu Morishita, Himeji, JP;
Shinichi Kouge, Himeji, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A power steering control apparatus for a car in which, under normal conditions, the steering becomes heavy as the speed of the car increases for the purpose of safety. This is realized by means of a hydraulic valve controlled by the reaction oil pressure of a proportional solenoid in the steering mechanism. In an abnormal condition such as the shortcircuit between solenoid coils or the failure of an electric control circuit, the proportional solenoid is deenergized through a failsafe circuit due to the fact that a feedback signal from the solenoid has become zero and the error with a high amplification gain between the car speed inverse proportional signal and the feedback signal has exceeded a first predetermined value. On the occasion of the voltage reduction of the power source for the electric control circuit and/or the increased temperature of the proportional solenoid, the failsafe circuit is disabled by an error protection circuit only when the difference between the car speed inverse proportional signal and the reduced feedback signal exceeds a second predetermined value.