Patent ID: 11939013
Assignee: HITACHI ASTEMO, LTD.
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 15:
16. A steering control device forming a steer-by-wire system, wherein a steering angle and a steering torque generated by a driver on a steering shaft connected to a steering wheel of a vehicle has no direct mechanical connection to a steered angle of a tire of the vehicle, the steering control device comprising:
a steering reaction force calculation unit that controls a steering reaction force according to a state of the vehicle, wherein the steering reaction force calculation unit controls a reaction force:
(i) based on a longitudinal direction, and
(ii) only when the vehicle travels straight; and

a calculation unit that determines the steered angle of the tire based on the steering angle and the steering torque generated on the steering shaft, wherein the calculation unit controls:
(i) the steered angle based on the steering torque in a region where the steering angle is equal to or smaller than a predetermined value,
(ii) the steered angle based on (a) a parameter different from the steering torque when the steering angle is larger than the predetermined value or (b) a changed steering torque gain from when the steering angle is smaller than the predetermined value,
(iii) the steering torque when the steering angle is smaller than the predetermined value, and
(iv) the steered angle when the steering angle is equal to or larger than the predetermined value,

wherein the predetermined value is changed according to a state of the vehicle or an intention of the driver.