| 摘要 |
There is provided an electric power steering system that is able to ensure the reliability of a compensation system based on a torque differential value, even during a period in which a detected steering torque value is held at a constant value. The electric power steering system includes a torque sensor (6) that outputs a detection signal (SÄ) corresponding to a steering torque, and a controller (5). The controller (5) computes a detected steering torque value (Ä) based on the detection signal (SÄ), and a torque differential value (dÄ), which is a first-order time differential value of the detected steering torque value (Ä). The controller (5) computes a current command value (I*) by providing compensation to a basic current command value (I1*) based on the detected steering torque value (Ä) with the use of a compensation value (I2*) based on the torque differential value (dÄ). When the detected steering torque value (Ä) is held for a predetermined period, the controller (5) holds the torque differential value (dÄ) at a value computed before the detected steering torque value (Ä) is held, during the period in which the detected steering torque value (Ä) is held. |
