Patent ID: 6711484
Filing Date: 2004-03-23
Classification: B62D

Abstract:
An electric power steering control system mounted on a vehicle that includes a steering apparatus, a torque sensor for detecting a steering force applied to said steering apparatus and a motor for assisting said steering force, said electric power steering control system comprising:first motor current determining means for determining a first motor current value of said motor in response to an output signal of said torque sensor; time constant variable type torque differential operation means having a differential function for differentiating the output signal of said torque sensor and capable of setting a differential time constant of said differential function to a commanded time constant; second motor current determining means for determining a second motor current value of said motor in response to an output of said time constant variable type torque differential operation means; time constant determining means for determining said differential time constant in response to a state quantity for the steering of said vehicle and commanding said differential time constant to said time constant variable type torque differential operation means; and motor drive control means for adding together said first and second motor currents thereby establishing a target current of said motor.