| 摘要 |
PROBLEM TO BE SOLVED: To accurately detect tooth chip abnormality of a gear without increase of costs in a steering angle detector of a steering shaft. SOLUTION: A speed increase detecting gear and a speed decrease detecting gear are rotated in association with a rotor gear which is integral with the steering shaft, the sampling data from MR sensors 7a, 7b provided to both the detecting gears is calculated at a speed-increasing gear calculation part 60 and a speed-decreasing gear calculation part 70, and the speed increasing angle and speed-decreasing angle of the steering shaft are computed. A failure diagnosis part 80 computes the moving averages of the speed-increasing angle and speed-decreasing angle, respectively at speed increasing and speed decreasing angle moving average processing parts 81, 82, and computes the difference of each moving average value at a difference computation part 84. When the displacement quantity of the difference for each sampling determined at a displacement quantity computation part 86 is larger than a reference value S0, an abnormality detection part 88 outputs an abnormality signal indicating that any of interlocking systems of each gear may have gear tooth chip abnormality. COPYRIGHT: (C)2009,JPO&INPIT
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