| 摘要 |
PURPOSE:To accurately determine car speeds at the time of the acceleration and braking a vehicle, by determining the max. value or min. value of plural kinds of car speeds as the car speed of the vehicle concerned when a rotational speed was generated in three or more kinds of mutual wheels. CONSTITUTION:Rotation sensors 60-66 for detecting the rotational speeds of front and rear wheels are provided and the outputs thereof are supplied to the I/O port 36 of an operation apparatus 34. The operation apparatus 34 constituted of a microcomputer determines the max. value of the outputs of the aforementioned sensor outputs as a car speed when slip or lock at the time of braking was generated in the certain wheel. When spin at the time of acceleration was generated in the certain wheel, the min. value of the aforementioned sensor outputs is determined as a car speed. By this method, even at the time of braking or acceleration, an accurate car speed can be calculated.
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