| 摘要 |
PURPOSE:To eliminate necessity of any special relative speed detecting means, and thereby to simplify constitution and reduce cost, by utilizing plural kinds of periods as a unit time, and calculating a relative speed of an own vehicle to an antecedent vehicle from an amount of change in a distance between both the vehicles during each of the periods. CONSTITUTION:There are provided a vehicle speed detecting means 21 for detecting a speed of an own vehicle and a distance detecting means 23 for detecting a distance between the own vehicle and an antecedent vehicle. Plural kinds of periods are used as a unit time, and a change in the distance between both the vehicles during each of the periods is computed by a distance change computing means 25 according to an output from the distance detecting means 23. Furthermore, a relative speed of the own vehicle to the antecedent vehicle is calculated by a relative speed computing means 27 according to the distance change during each of the periods. Then, a period is selected according to the calculated relative speed by a relative speed selecting means 29, and the relative speed calculated with respect to the selected period is fed to a vehicle speed control means 31 so as to control the speed of the own vehicle.
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