| 摘要 |
PURPOSE:To detect abnormality of a wheel speed on the basis of the actual by using a prescribed pattern for the reference value of judgment when detecting the abnormality of the wheel speed on the basis of the difference between the current and preceding wheel speeds. CONSTITUTION:Wheel speed pulses 2 are inputted to a wheel speed arithmetic part 31 to calculate a wheel speed. The current wheel speed is stored in the 1st wheel speed memory 34, and the preceding wheel speed is stored in the 2nd wheel speed memory 35. Those wheel speeds are inputted to a wheel speed abnormality detection part 36a, and a changeover switch 37 for correction is switched from normal mode I to abnormal mode II by the output of an abnormality discriminating part 36b when the difference between both wheel speed exceeds a prescribed value. The reference of judgement of wheel speed abnormality for the wheel speed abnormality detection part 36a is supplied from a reference value determination part 38 and the judgement reference has the reference value determination pattern which decreases as the wheel speed increases.
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