| 摘要 |
<p>Each rotation angle sensor configuring a torque sensor outputs sensor signals of three phases which have a composite waveform of a triple angle component and a 7-fold angle component, and having phases of signal changes corresponding to the rotation angle equally shifted. On the other hand, the respective rotation angle detection units subtract an average value of the respective sensor values a, b, and c from the respective sensor values a, b, and c, and extract values of the 7-fold angle components included in the respective sensor values a, b, and c to detect an electric angle ¸el having the multiplication factor of angle of 7. Seven mechanical angle estimated values ¸ab_e (¸ab_e1 to ¸ab_e7) estimated on the basis of the electric angle ¸el are converted into triple angle components, and compared with the average values of the respective sensor values a, b, and c, to thereby detect a mechanical angle (¸ab) of a steering shaft to be detected.</p> |
