| 摘要 |
PURPOSE:To improve detection precision by finding the slit rate between a wheel and a road surface on the basis of a coefficient of correction calculated by a correction coefficient calculating means, the detection result of a detecting means, and the detection result of a noncontact ground speed sensor. CONSTITUTION:The detection result of a detecting means 1 in a state of neither acceleration nor deceleration indicates an accurate vehicle speed. The detection result of the noncontact ground speed sensor 2 varies with the distance H between the sensor 2 and road surface; and the coefficient of correction to a vehicle speed detected by the sensor 2 on the basis of the detection result of the detecting means 1 and the detection result of the sensor 2 when the vehicle is in a state of neither acceleration nor deceleration and the slit rate is detected accurately on the basis of the calculated coefficient of correction, the detection result of the detecting means 1, and the detection result of the sensor 2.
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