| 摘要 |
<p>PURPOSE:To improve the safety by decreasing the assist torque value than that at the ordinary time and stopping self-aligning torque control when no absolute steering angle is detected in the control method using assist torque control in response to the steering torque and self-aligning torque control in response to the steering angle. CONSTITUTION:The control system of an electric power steering device is constituted of an assist command section 1 and a restoration command section 2, and the assist command section 1 issues the assist torque command value based on the steering torque signal by a torque sensor 3. On the other hand, the restoration command section 2 issues the self-aligning torque command value with the added value of the self-aligning torque value based on the steering angle signal by a steering angle sensor 4 and the damping torque value in response to the steering angle speed. When it is judged that no absolute steering angle is detected by the steering angle sensor 4, a warning unit is operated, the assist torque command value is decreased than that at the ordinary time, and the control by the self-aligning torque value in response to the steering angle is stopped.</p> |
