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1. (WO2016088705) ELECTRIC POWER STEERING DEVICE

Pub. No.:    WO/2016/088705    International Application No.:    PCT/JP2015/083560
Publication Date: Jun 9, 2016 International Filing Date: Nov 30, 2015
IPC: B62D 6/00
B62D 5/04
B62D 101/00
B62D 113/00
B62D 119/00
Applicants: NSK LTD.
日本精工株式会社
Inventors: MINAKI Ryo
皆木 亮
SUGAWARA Takayoshi
菅原 孝義
SAWADA Hideki
澤田 英樹
Title: ELECTRIC POWER STEERING DEVICE
Abstract:
[Problem] To provide an electric power steering device which is capable of switching control in a smooth and self-steerless manner by gradually changing the command values of the control torque for torque control and of position/velocity control during a fade process. [Solution] An electric power steering device having a torque sensor that detects the steering torque and having a motor control device that controls a motor which applies assist torque, which assists steering, to a steering system of a vehicle, wherein: the electric power steering device is equipped with a function with which a control method for the motor is switched, in accordance with a prescribed switching trigger, between a torque control method in which the motor output torque is controlled and a position/velocity control method in which the steering angle is controlled; and the fade process of a transition from the position/velocity control method to the torque control method or of the reverse transition is varied in response to the steering torque.