| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric power steering system capable of driving a brushless motor and improving steering feeling when a switching element in a driving circuit of the brushless motor fails in short-circuit.SOLUTION: When one FET 31 in a driving circuit 30 fails in short-circuit, a control part 40 identifies the FET which fails in short-circuit. The control part 40 sets a voltage command value corresponding to current to be supplied to an electric motor 18, based on a detected steering torque. Then the control part 40 corrects the voltage command value based on a steering angle. In fact the control part 40 reduces and corrects the voltage command value when the absolute value of the steering angle is higher than a predetermined threshold. |
