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Title:
ELECTRIC POWER STEERING DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/168891
Kind Code:
A1
Abstract:
[Problem] To provide an electric power steering device that is able to easily achieve a desired torque in response to a steering angle without being affected by road surface conditions or by a change in mechanical properties of a steering system due to aging. [Solution] Provided is an electric power steering device that is provided with a torsion bar on a steering column shaft of a vehicle and that is for performing a control for assisting a steering system by drive-controlling a motor connected to the steering column shaft on the basis of a current command value, the electric power steering device being provided with: a target steering torque generation unit for generating a target steering torque on the basis of at least one piece of EPS/vehicle information; a conversion unit for converting the target steering torque into a target twist angle; and a twist angle control unit for calculating the current command value on the basis of the target twist angle, a steering angle, a twist angle of the torsion bar, and a motor angular velocity, wherein the twist angle is controlled so as to follow the target twist angle.

Inventors:
TSUBAKI Takahiro (78 Toriba-Machi, Maebashi-Sh, Gunma 27, 〒3718527, JP)
Application Number:
JP2018/009861
Publication Date:
September 20, 2018
Filing Date:
March 14, 2018
Export Citation:
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Assignee:
NSK LTD. (1-6-3, Ohsaki Shinagawa-K, Tokyo 60, 〒1418560, JP)
International Classes:
B62D6/00; B62D5/04; B62D113/00; B62D117/00; B62D119/00
Attorney, Agent or Firm:
AGATA Yuzo (NIKKEN Akasaka Bldg. 8F, 5-7 Akasaka 2-Chome, Minato-K, Tokyo 52, 〒1070052, JP)
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