US 12,391,306 B2
Steer-by-wire type steering device
Hiroki Sonoda, Hitachinaka (JP); Yoshiji Hasegawa, Hitachinaka (JP); and Tomoaki Fujibayashi, Hitachinaka (JP)
Assigned to HITACHI ASTEMO, LTD., Hitachinaka (JP)
Appl. No. 18/044,355
Filed by HITACHI ASTEMO, LTD., Hitachinaka (JP)
PCT Filed Sep. 2, 2021, PCT No. PCT/JP2021/032278
§ 371(c)(1), (2) Date Mar. 7, 2023,
PCT Pub. No. WO2022/054683, PCT Pub. Date Mar. 17, 2022.
Claims priority of application No. 2020-151396 (JP), filed on Sep. 9, 2020.
Prior Publication US 2023/0339534 A1, Oct. 26, 2023
Int. Cl. B62D 5/04 (2006.01); B62D 6/00 (2006.01); B62D 15/00 (2006.01)
CPC B62D 5/046 (2013.01) [B62D 5/0475 (2013.01); B62D 6/008 (2013.01); B62D 15/00 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A steer-by-wire type steering device mounted in a vehicle, the steer-by-wire type steering device comprising:
a steering input device including:
a steering operation input member; and
a reaction force actuator that applies a steering reaction force to the steering operation input member; and
a control device including:
a steering gear ratio change unit that changes a steering gear ratio in accordance with a vehicle speed of the vehicle, the steering gear ratio being a ratio of a steering angle of a wheel of the vehicle to an operation angle of the steering operation input member;
a reaction force actuator control unit that controls an output amount of the reaction force actuator in accordance with an operation angular velocity of the steering operation input member; and
a reaction force actuator output amount change unit that changes, based on the steering gear ratio, the output amount of the reaction force actuator corresponding to the operation angular velocity:
wherein the reaction force actuator output amount change unit:
increases the output amount of the reaction force actuator corresponding to the operation angular velocity as the operation angular velocity increases when the steering gear ratio is less than a predetermined value, and
decreases the output amount of the reaction force actuator corresponding to the operation angular velocity as the operation angular velocity increases when the steering gear ratio is greater than the predetermined value.