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Title:
ELECTRIC POWER STEERING DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/070511
Kind Code:
A1
Abstract:
[Problem] To provide an electric power steering device which relieves a sense of discomfort of a driver during steering control, by improving the follow-up property of an actual steering angle to a target steering angle, and further, by efficiently suppressing vehicle vibration. [Solution] The present invention is provided with: a torque control unit that calculates a first motor current command value on the basis of steering torque, etc.; a target steering angle generating unit that generates a target steering angle on the basis of vehicle information; and a steering angle control unit that calculates a second motor current command value on the basis of the target steering angle, an actual steering angle, etc. A motor current command value is calculated from the first and second motor current command values. The target steering angle generating unit includes: a lateral position control unit that calculates a lateral speed command value from the deviation between a lateral position command value and a lateral position; a lateral speed calculating unit that calculates the lateral speed from the lateral position; a lateral speed control unit that calculates a basic target steering angle on the basis of the lateral speed command value and the lateral speed; and a vehicle behavior stabilizing unit that calculates a compensative target steering angle from the lateral direction acceleration which is obtained on the basis of the vehicle information. The target steering angle generating unit generates a target steering angle from the basic and compensative target steering angles.

Inventors:
TSUBAKI TAKAHIRO (JP)
Application Number:
PCT/JP2017/037145
Publication Date:
April 19, 2018
Filing Date:
October 13, 2017
Export Citation:
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Assignee:
NSK LTD (JP)
International Classes:
B62D6/00; B60W30/06; B60W30/10; G05B11/36; B62D101/00; B62D111/00; B62D113/00; B62D119/00; B62D137/00
Domestic Patent References:
WO2014136515A12014-09-12
WO2017150445A12017-09-08
Foreign References:
JP2015217707A2015-12-07
JP2014223857A2014-12-04
JP2014054885A2014-03-27
JP2013252729A2013-12-19
JP3917008B22007-05-23
JP2013252729A2013-12-19
Other References:
See also references of EP 3489113A4
Attorney, Agent or Firm:
AGATA Yuzo (JP)
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