ELECTRIC POWER STEERING CONTROL DEVICE AND ELECTRIC POWER STEERING CONTROL METHOD

摘要

Provided is an electric power steering control device which can realize a more appropriate countermeasure against heat in accordance with a thermal characteristic of a component used to supply a motor current. The electric power steering control device for assisting a steering force of a steering wheel of a vehicle including a control unit (10). The control unit (10) prestores a first overheat-protection characteristic corresponding to self-heating and a second overheat-protection characteristic corresponding to an ambient temperature for each component (12 to 15) mounted in the control unit as an overheat-protection characteristic specifying a correspondence relationship between a heat-source current value of the each component and an overheat-protection coefficient, and sequentially corrects a current upper-limit value obtained for the each component by using overheat-protection coefficients of both characteristics to continue current control in accordance with a smallest current upper-limit value of results of the correction.