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Patent Searching and Data


Title:
VEHICLE STEERING DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/183838
Kind Code:
A1
Abstract:
[Problem] To provide a vehicle steering device that makes it possible to easily attain a steering torque equivalent to a steering angle or the like independently of the state of a road surface and without being affected by changes in the mechanical characteristics of a steering system resulting from aging. The present invention also addresses the problem of suitably conveying steering reaction force to a driver as a steering sensation when a vehicle is stopped or moving at a very low speed. [Solution] A vehicle steering device that performs assistance control of a steering system, said vehicle steering device being provided with: a target steering torque generation unit for generating a target steering torque; a conversion unit for converting the target steering torque to a target torsion angle; and a torsion angle control unit that calculates a motor current command value whereby the torsion angle is made to follow the target torsion angle. The target steering torque generation unit is equipped with a static steering characteristic correction unit that determines a first torque signal on the basis of desired static steering characteristics corresponding to the steering angle. The first torque signal is output as the target steering torque, and the driving of a motor is controlled on the basis of the motor current command value.

Inventors:
TSUBAKI TAKAHIRO (JP)
KUMAGAI HIROYASU (JP)
Application Number:
PCT/JP2019/049288
Publication Date:
September 17, 2020
Filing Date:
December 17, 2019
Export Citation:
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Assignee:
NSK LTD (JP)
International Classes:
B62D5/04; B62D6/00; B62D101/00; B62D113/00
Domestic Patent References:
WO2018084190A12018-05-11
Foreign References:
JP2017056745A2017-03-23
JP2008168858A2008-07-24
Attorney, Agent or Firm:
AGATA Yuzo (JP)
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