Motor-assisted power steering control device

A motor-assisted power steering control device which comprises:

• a detecting means for detecting a steering torque of a steering wheel,
• first stabilizing means for substantially reducing uneven vibrations in the steering wheel, said first stabilizing means comprising a phase lead compensating means for compensating a phase lead of the detected steering torque,
• error obtaining means for obtaining an error between the detected steering torque which has been compensated by said phase lead compensating means and a target steering torque,
• second stabilizing means for providing smooth steering operation, said second stabilizing means comprising at least one among a proportional, an integration and a differentiation (PID) controller operating on the error, said second stabilizing means receiving said error from said error obtaining means,
• a motor for generating an auxiliary steering torque of the steering wheel, and
• means for controlling the motor in response to said at least one PID controller, wherein uneven vibrations in the steering wheel caused by rapid torque changes are substantially eliminated by the operation of said first and second stabilizing means.