| 摘要 |
There is provided an electric power steering device capable of detecting steering torque with high accuracy without use of a torque sensor, and capable of performing appropriate steering assistance control. An alternative torque correction value (Tc) is operated by comparing alternative torque (T0) operated based on an angle signal at normal time of the torque sensor (3) with a torque detection value (Ti) detected by the torque sensor (3), and is then stored. Then, at normal time of the torque sensor (3), the steering assistance control is performed based on the torque detection value (Ti) detected by the torque sensor (3), whereas when an abnormality happens in the torque sensor (3), the steering assistance control is performed based on corrected alternative torque (T1) obtained by correcting the alternative torque (T0) by the alternative torque correction value (Tc). |
