Invention Grant
- Patent Title: Electric power steering apparatus
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Application No.: US16333356Application Date: 2018-03-06
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Publication No.: US10946891B2Publication Date: 2021-03-16
- Inventor: Toru Sakaguchi , Shoya Maruyama
- Applicant: NSK Ltd.
- Applicant Address: JP Tokyo
- Assignee: NSK Ltd.
- Current Assignee: NSK Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JPJP2017-078907 20170412,JPJP2017-234074 20171206
- International Application: PCT/JP2018/008467 WO 20180306
- International Announcement: WO2018/190036 WO 20181018
- Main IPC: B62D5/04
- IPC: B62D5/04 ; B62D3/12 ; B62D6/00

Abstract:
An electric power steering apparatus that suppresses occurrence of an abnormal noise at end hitting without providing uncomfortable feeling of steering for a driver, attenuates impact force, and enables suppression of the abnormal noise without making a turning radius worse. The apparatus includes a viscoelastic model following control section that sets a viscoelastic model as a reference model within a predetermined range in front of a rack end, and outputs a control output to correct a current command value; and a rack end approach judging section that performs judgment of being in the predetermined range in front of the rack end based on steering position information; adjusts the control output based on at least the steering position information, a steering velocity and a steering state, and corrects the current command value by the adjusted control output.
Information query
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