| 摘要 |
To provide an electric power steering device that can reliably detect the abnormality of a steering angle sensor (8) and prevent the generation of a wrong decision. When both the two differences (|¸a -¸r|, |¸a -¸e|) between an absolute steering angle value ¸a obtained from a steering angle sensor (8) and a relative steering angle value ¸r estimated from the rotating angle sensor (7) of a motor (5), and an estimated steering angle value ¸e estimated from the induced voltage of the motor respectively exceed predetermined values (threshold values), the steering angle sensor (8) is determined to be failed.
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