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:
Sep. 08, 2020
Filed:
Jan. 05, 2017
Hitachi Automotive Systems, Ltd., Hitachinaka-shi, Ibaraki, JP;
Takahiro Itou, Tokyo, JP;
Masaru Yamasaki, Tokyo, JP;
Mitsuo Sasaki, Hitachinaka, JP;
Kazuya Yamano, Hitachinaka, JP;
HITACHI AUTOMOTIVE SYSTEMS, LTD., Hitachinaka-Shi, JP;
Abstract
Provided is a steering device which allows continued safe travel in the event of a fault during automatic steering control. The steering device is equipped with an electric drive device composed of a plurality of systems of electric motors and has an assist control function for assisting a driver in steering and an automatic steering control function for automatically controlling the steering angle of steered wheels on the basis of a steering angle instruction value. In the event a fault occurs in one of the electric motor systems of the electric drive device during control under automatic operation control, a controller in the steering device maintains automatic operation control Susing the electric motor of a normally operating system not suffering from a fault, and then, upon shifting to assist control S, the controller sets the output limit value of the electric motor to a fault-time output limit value, which is less than a normal-time output limit value set when all electric motor systems are operating normally.