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:
Dec. 09, 2014
Filed:
Nov. 23, 2012
Jtekt Corporation, Osaka-shi, JP;
Ryouhei Hayama, Nabari, JP;
JTEKT Corporation, Osaka, JP;
Abstract
In a vehicle steering system, when a sensor malfunction determination unit detects a malfunction of a rotation angle sensor, the sensor malfunction determination unit changes a control mode from a first control mode to a second control mode. In the second control mode, an actual rotor angle (mechanical angle) (θ) of a steered system motor is computed on the basis of a second rotor angle (electric angle) (θ) estimated by a rotation angle estimation unit. Then, feedback control is executed such that the actual rotor angle (θ) converges to a target rotor angle (θ*) that is obtained by superimposing a rotation maintaining command signal on a target rotor angle (θ*) computed by a target rotor angle computation unit.