Patent ID: 6902028

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