Title:
ELECTRIC POWER STEERING DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/168897
Kind Code:
A1
Abstract:
[Problem] To provide an electric power steering device in which both assist control and steering angle control can be performed in such a manner as to enable a manual steering operation when automatic steering is interrupted by a driver's manual steering operation so as to ensure increased safety during an emergency steering operation by the driver. [Solution] This electric power steering device is provided with: a steering angle control unit that calculates a steering angle-controlling current command value for steering control on the basis of at least a steering angle command value and an actual steering angle; and a switchover determination/gradual gain generation unit that determines the steering state on the basis of determination of a manual input and then switches the steering state, wherein the steering angle control unit is provided with a filter unit that converts, into an extended steering angular velocity command value, a steering angular velocity command value calculated on the basis of at least the steering angle command value and the actual steering angle, and calculates a steering angle-controlling current command value on the basis of the extended steering angular velocity command value and an actual angular velocity, and the switchover determination/gradual gain generation unit is provided with a manual input determination unit that determines a manual input using a threshold value with respect to a steering torque, and calculates a current command value using at least the steering angle control current command value.
Inventors:
TSUBAKI TAKAHIRO (JP)
KIKUTA TOMOYUKI (JP)
KIKUTA TOMOYUKI (JP)
Application Number:
PCT/JP2018/009880
Publication Date:
September 20, 2018
Filing Date:
March 14, 2018
Export Citation:
Assignee:
NSK LTD (JP)
International Classes:
B62D6/00; B62D5/04; B62D101/00; B62D113/00; B62D117/00; B62D119/00
Domestic Patent References:
| WO2014136515A1 | 2014-09-12 | |||
| WO2014162769A1 | 2014-10-09 |
Foreign References:
| JP2002002519A | 2002-01-09 | |||
| JP2015020604A | 2015-02-02 | |||
| JP2001074571A | 2001-03-23 | |||
| US20110098890A1 | 2011-04-28 | |||
| JP2001039325A | 2001-02-13 |
Other References:
See also references of EP 3597509A4
Attorney, Agent or Firm:
AGATA Yuzo (JP)
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