Patent ID: 11897551
Assignee: SENTIENT IP AB
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 10:
11. A system for controlling a feedback torque actuator with a motor with an Electric Control Unit (ECU) for giving feedback to a driver, a steering wheel to which the driver applies a driver torque (TD) in a steering system comprising a steering assistance actuator with a torsion bar, wherein the system comprises:
means for measurement of a steering angle,
a torsion bar torque sensor for measurement of the torque of the torsion bar, the ECU comprising:
means for measurement of a current in the motor of said feedback torque actuator,
means for transformation of the above-mentioned current to an estimated feedback torque by the use of a current-to-torque characteristics of the motor,
means for calculation of the before-mentioned driver torque by adding the sensed torsion-bar torque and the estimated feedback torque,
means for calculation of a target feedback torque actuator state from either said calculated driver torque or said measured steering angle, and
means for control of the mentioned feedback torque actuator via a closed loop current control to achieve said target feedback torque actuator state, so that a desired steering feel is achieved.