Conventionally, there was a problem that in cases when it is difficult to
place a temperature sensor in the vicinity of a heat-generating portion,
overheating could not be prevented. Disclosed is an electric power
steering control system including a torque sensor for detecting steering
force of a steering system; a motor current determination unit for
determining the motor current based on the steering force detected by the
torque sensor; a temperature sensor for detecting an ambient temperature;
a coefficient setting unit for setting a coefficient in accordance with
the detected temperature obtained by means of the temperature sensor; a
motor current detection unit for detecting a motor current being passed to
a motor; a maximum current limit value calculation unit for calculating a
maximum current limit value based on the detected current and the
coefficient; a current limiting unit for selecting the smaller value
between the motor current determined by the motor current determination
unit and the maximum current limit value calculated 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 detected current, whereby a motor current limit being set according
to temperature is applied.
