Patent ID: 6678595
Filing Date: 2004-01-13
Classification: B62D

Abstract:
A method of simulating a steering resistance torque on a vehicle steering wheel of a steer-by-wire system using a magnetorheological device and a motor, the method comprising:sensing an actual angular velocity of the steering wheel; comparing the actual angular velocity with a threshold angular velocity of the steering wheel; calculating a magnetorheological torque signal indicative of magnetorheological torque to be applied by the magnetorheological device on the steering wheel, the magnetorheological torque signal being based on the comparison of the actual angular velocity with a threshold angular velocity of the steering wheel; determining an error signal based on the magnetorheological signal and a torque reference signal, the torque reference signal being a function of a steering wheel variable; calculating a motor torque signal indicative of motor torque to be applied by the motor to the steering wheel, the motor torque signal being based on the error signal and an input torque signal, the error signal being a difference between the magnetorheological torque signal and the torque reference signal; applying the magnetorheological torque generated by the magnetorheological device to the steering wheel; and applying the motor torque generated by the motor to the steering wheel.