| 主权项 |
1. An electric power steering system comprising:
a motor that applies assist force to a steering mechanism of a vehicle; a torque sensor that outputs a detection signal corresponding to a steering torque applied to the steering mechanism; and a controller that computes a detected steering torque value based on the detection signal, and executes current feedback control for causing an actual current value of the motor to follow a current command value based on the detected steering torque value, wherein: when the detected steering torque value is held at a past value, the controller makes a feedback gain of the current feedback control smaller than a feedback gain that is used when the detected steering torque value is not held, the torque sensor alternately outputs a malfunction diagnosis signal and the detection signal, the malfunction diagnosis signal is based on a determination of a malfunction of the torque sensor, the controller detects the malfunction of the torque sensor on a basis of the malfunction diagnosis signal, and at least during a period in which the malfunction diagnosis signal is output from the torque sensor, the controller holds the detected steering torque value as the held past value. |
