| 摘要 |
To provide an electric power steering device that can reliably detect the abnormality of a steering angle sensor and prevent the generation of a wrong decision. When both the two differences (|thetaa-thetar |, |thetaa-thetae|) between an absolute steering angle value thetaa obtained from a steering angle sensor and a relative steering angle value thetar estimated from the rotating angle sensor of a motor, and an estimated steering angle value ee estimated from the induced voltage of the motor respectively exceed predetermined values (threshold values), the steering angle sensor is determined to be failed.
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