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

Claim 16:
17. 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 reaction force according to a state of the vehicle and/or the steering angle, wherein the steering reaction force calculation unit decreases the reaction force only when the steering angle, a steering angular velocity, and a steering angular acceleration have an identical sign; 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, and
(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,

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