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.
