Invention Grant
- Patent Title: Electric power steering apparatus
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Application No.: US14651949Application Date: 2014-09-25
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Publication No.: US09725112B2Publication Date: 2017-08-08
- Inventor: Tetsuya Kitazume
- Applicant: NSK LTD.
- Applicant Address: JP Shinagawa-ku, Tokyo
- Assignee: NSK LTD.
- Current Assignee: NSK LTD.
- Current Assignee Address: JP Shinagawa-ku, Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2014-024669 20140212
- International Application: PCT/JP2014/075448 WO 20140925
- International Announcement: WO2015/122043 WO 20150820
- Main IPC: B62D5/04
- IPC: B62D5/04 ; B62D6/00 ; B62D6/04 ; B62D15/02 ; B62D6/10

Abstract:
[Problem]An object of the present invention is to provide an electric power steering apparatus that is capable of positively returning a steering wheel to a neutral point in such a running state as to return to a going straight state by calculating a return control current corresponding to a steering angle and a steering speed and compensating a current command value.[Means for solving the problem]An electric power steering apparatus comprising: a steering wheel return control section that calculates a return control current with a steering angle, a vehicle speed and a steering speed, and drives a motor with a compensated current command value left by the subtraction of the return control current from a current command value, wherein the steering wheel return section comprises a base-return control current calculating section that calculates a base-return control current, a target steering speed calculating section that calculates a target steering speed, a return control gain calculating section that calculates a deviation between the target steering speed and the steering speed, performs coding, and at a same time calculates a return control gain by using at least two control calculations among a P-control calculation, an I-control calculation and a D-control calculation, a limiter that limits a maximum value of the return control gain, and a correcting section that corrects the base-return control current with an output gain of the limiter and outputs the return control current.
Public/Granted literature
- US20160347357A1 ELECTRIC POWER STEERING APPARATUS Public/Granted day:2016-12-01
Information query
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