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. 29, 1991
Filed:
Jul. 25, 1989
Hidetoshi Tabuse, Osaka, JP;
Koyo Seiko Co., Ltd., Osaka, JP;
Abstract
An electric power steering system comprising a power unit consisting essentially of drive circuits for an electric motor and the like, and a control unit separate from the power unit and consisting essentially of a control circuit for controlling the drive circuits. The control unit is connected to each of the drive circuits of the power unit by a transmission line for the control unit to transmit therethrough 'ON' or 'OFF' representing logical control signals to the drive circuit to thereby control the drive circuit. The power steering system has first signal conversion means provided in the control unit for converting an 'ON' representing logical control signal to a pulse signal, and second signal conversion means provided in the power unit and connected to the first signal conversion means by a transmission line for producing an 'ON' logical control signal when the input signal given is the pulse signal or for producing an 'OFF' logical control signal when the input signal is not the pulse signal.