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:
Jul. 04, 2023
Filed:
Mar. 15, 2017
Hitachi Automotive Systems, Ltd., Hitachinaka, JP;
Tatsuo Matsumura, Higashimatsuyama, JP;
KNORR-BREMSE STEERING SYSTEM JAPAN LTD., Saitama, JP;
Abstract
Power steering device has steering mechanismpower cylinderhaving a pair of hydraulic chambersdivided by pistonand providing steering force to steering mechanism, torque sensordetecting steering torque Tr of steering mechanism, rotary valveselectively supplying working fluid supplied from pumpto the pair of hydraulic chambers according to relative rotation between input and output shafts, hollow shaft motorproviding steering force to input shaft, control unitin which microcomputer is mounted, and torque command signal operating sectionprovided in control unit and configured to calculate torque command signal Tm* for driving and controlling electric motoron the basis of the steering torque Tr and vehicle speed Vs and when vehicle speed is a predetermined vehicle speed or greater, set torque command signal to 0. With this, physical size of power steering device can be decreased.