US 12,077,230 B2
Steering control device, steering control method, and steering control system
Hiroki Sonoda, Hitachinaka (JP); Tomoaki Fujibayashi, Hitachinaka (JP); Yoshiji Hasegawa, Hitachinaka (JP); Kazuya Takahashi, Hitachinaka (JP); and Toshihiko Kaneda, Hitachinaka (JP)
Assigned to Hitachi Astemo, Ltd., Hitachinaka (JP)
Appl. No. 17/596,440
Filed by Hitachi Astemo, Ltd., Hitachinaka (JP)
PCT Filed May 20, 2020, PCT No. PCT/JP2020/019926
§ 371(c)(1), (2) Date Dec. 10, 2021,
PCT Pub. No. WO2020/250634, PCT Pub. Date Dec. 17, 2020.
Claims priority of application No. 2019-110444 (JP), filed on Jun. 13, 2019.
Prior Publication US 2022/0332366 A1, Oct. 20, 2022
Int. Cl. B62D 6/00 (2006.01); B62D 7/15 (2006.01)
CPC B62D 6/002 (2013.01) [B62D 7/159 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A steering control device comprising:
a control unit that outputs a calculation result based on input information to a rear wheel steering device that controls a rear wheel steering angle of a vehicle so as to be steered in opposite-phase with respect to a front wheel steering angle according to the front wheel steering angle of the vehicle based on a driver's steering wheel operation,
wherein the control unit determines a rear wheel steering angle control command for returning the rear wheel steering angle to a predetermined steering angle earlier than the front wheel steering angle when the steering wheel operation shifts from a state of additional turning to a state of cutback turning, and outputs the rear wheel steering angle control command to the rear wheel steering device,
wherein the control unit sets the predetermined steering angle to a steering angle value in a vicinity including a steering neutral position, and
wherein the control unit determines the rear wheel steering angle control command so that a second ratio is greater than a first ratio, the first ratio being a ratio of the rear wheel steering angle to the front wheel steering angle when the front wheel steering angle is equal to or greater than the predetermined steering angle, and the second ratio being a ratio of the rear wheel steering angle to the front wheel steering angle when the front wheel steering angle is less than the predetermined steering angle.