Patent ID: 9013122
Filing Date: 2015-04-21
Classification: B62D,H02H,H02P

Abstract:
1. An electric power steering control device for assisting a steering force of a steering wheel of a vehicle, the electric power steering control device comprising a control unit for supplying a current for driving an electric motor, wherein the control unit prestores a first overheat-protection characteristic corresponding to self-heating and a second overheat-protection characteristic corresponding to an ambient temperature in a storage section for each component 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 defining an increase/decrease amount of a current upper-limit value, and sequentially corrects the current upper-limit value obtained for the each component by using overheat-protection coefficients of both the first overheat-protection characteristic and the second overheat-protection characteristic to continue current control for the electric motor with a limitation on the current for driving the electric motor in accordance with a smallest current upper-limit value of results of the correction.