The collision dangerous judgment manner null in the collision prevention

摘要

PURPOSE:To inhibit a rear-end collision evading means from being operated when it is desired to shorten a distance between cars during a traffic jam and when an intruding car is present by adding additional time led out from the confidence of being in a condition for shortening the distance between the cars during the traffic jam to automatic brake operation intra-car time and calculating alarm operation reference intra-car time. CONSTITUTION:The deceleration of the present car corresponding to a present car speed and road conditions is led out, a preceding car speed is led out and the deceleration of the preceding car is led out (S1 and S2). The automatic brake operation intra-car time is calculated, the additional time led out from the confidence of being in the condition where a driver desires to shorten the distance between the cars during the traffic jam is added to the automatic brake operation intra-car time and the alarm operation reference intra-car time is calculated (S3 and S4). Then, present intra-car time, margin time, a margin time change speed and margin time change acceleration are calculated (S5 to S8) and a rear-end collision danger increase/decrease degree is calculated (S9).