Patent ID: 6860361

Claim:
An electric power steering control system comprising: a motor adding steering assistance force to a steering system; a steering force detection means for detecting steering force of the steering system; a motor current determination means for determining a motor current based on at least the steering force detected by the steering force detection means; a temperature detection means for detecting an ambient temperature; a timer means for measuring time from when predetermined conditions are established; a control temperature calculation means for calculating a control temperature based on the temperature detected by the temperature detection means and the time measured by the timer means; a coefficient setting means for setting a coefficient based on the control temperature calculated by the control temperature calculation means; a motor current detection means for detecting a current being passed to the motor; a maximum current limit value calculation means for calculating a maximum current limit value based on a current detected by the motor current detection means and the coefficient set by the coefficient setting means; a current limiting means for selecting a smaller value between the motor current determined by the motor current determination means and the maximum current limit value calculated by the maximum current limit value calculation means, and outputting the smaller value between the motor current and the maximum current limit value as a target current; and a motor current control means for passing the target current to the motor in such a way that the motor current is equal to the current detected by the motor current detection means.