| 摘要 |
<p>An ECU (11) (microcomputer (21)) detects a steering angle (θs) that is an absolute angle based on a sine signal (S_sin) and a cosine signal (S_cos) that are output from a steering sensor. The ECU (11) includes a three-phase pulse generator (30) that generates, based on the sine signal (S_sin) and the cosine signal (S_cos), three-phase pulse signals (P1, P2, P3) that have edges corresponding to predetermined rotational angles and that are set in such a manner that the predetermined rotational angles corresponding to the respective edges do not overlap each other and are at regular intervals. The microcomputer (21) has a function as a second rotational angle detector that calculates a steering angle based on the pulse signals P1, P2 and P3.
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