公开(公告)号：US10112643B2

公开(公告)日：2018-10-30

申请号：US15115908

申请日：2015-02-04

Applicant: KYB Corporation

Inventor： Hiroyuki Gotou ,  Noboru Yoshida ,  Kenji Nishikubo ,  Yuichiro Okamoto ,  Kouichi Yamashina

IPC: B62D5/04 ,  B62D15/02

Abstract: An electric power steering device includes a phase advance correction unit configured to advance a phase of a steering torque signal detected by a torque sensor detecting a steering torque input from a steering wheel, a specific frequency extraction unit configured to extract a component in a specific frequency band out of the steering torque signal detected by the torque sensor, a gain multiplication unit configured to correct a steering torque signal computed on the basis of an output signal of the phase advance correction unit and an output signal of the specific frequency extraction unit such that the steering torque signal reaches a limit value set by a limiter by multiplying the steering torque signal by a gain, and an addition unit configured to add an assist correction command value calculated on the basis of an output signal output from the gain multiplication unit to the assist command value.

公开(公告)号：US10106191B2

公开(公告)日：2018-10-23

申请号：US15116507

申请日：2015-02-04

Applicant: KYB Corporation

Inventor： Hiroyuki Gotou ,  Noboru Yoshida ,  Yuichiro Okamoto ,  Nobuyuki Kimura ,  Takayuki Nagase ,  Kazuma Yamazaki

IPC: B62D5/04

Abstract: An electric power steering device includes a basic return command value calculation unit configured to calculate a basic return command value in a direction to return a steering wheel to a neutral position on the basis of a steering angle of a steering wheel, a turn/return determination unit configured to determine the turn and the return of the steering wheel, a gradually changing return command value calculation unit configured to calculate a gradually changing return command value, the gradually changing return command value gradually increasing, while the return of the steering wheel is determined by the turn/return determination unit, and a return command value calculation unit configured to calculate a return command value by adding the gradually changing return command value to the basic return command value. The electric motor is driven by adding the return command value to the assist command value.