Vehicle rear-end collision warning and protecting method and system

Abstract

The invention discloses a vehicle rear-end collision warning and protecting method, which comprises the following steps that the rear-vehicle relative vehicle speed V1 and the rear-vehicle relative distance S1 are measured in real time; the self-vehicle absolute vehicle speed V2 and the wheel rotating speed W are measured in real time; the rear-vehicle absolute speed V is obtained through calculation according to the self-vehicle absolute vehicle speed V2 and the rear-vehicle relative vehicle speed V1 in accordance with a formula that V=V1+V2; the tire slippage rate Delta is calculated by utilizing the self-vehicle absolute vehicle speed V2 and the wheel rotating speed W, and further, the current pavement attachment coefficient K is calculated; the rear-vehicle real-time brake distance S2 is obtained through calculation according to the rear-vehicle absolute speed V and the current pavement attachment coefficient K; the safe distance S between the two vehicles is calculated in accordance with a formula that S=S2-S1; and the judgment is carried out according to the safe distance S and the rear-vehicle relative distance S1, and warning information is issued and / or a vehicle rear protection air bag is propped out according to judgment results.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a vehicle rear-end collision warning and protection system. Background technique [0002] Rear-end collision accidents often occur in current urban traffic and highways. According to traffic control department statistics, rear-end collision accidents have accounted for about 30% of the total amount of road traffic accidents. The main reason for rear-end collisions is that the speed of the vehicle is too fast, the driver has insufficient judgment on the braking distance of the vehicle or the driver’s insufficient judgment on the relative distance and braking distance of the rear vehicle, and the driver is not alert enough, so it is necessary to install a vehicle rear-end collision warning and protection system It has very good practical significance. [0003] At present, the mainstream technologies for preventing rear-end collision accidents at home and abroad are mainly as follows: ...

AI Technical Summary

Problems solved by technology

[0007] The above three mainstream technologies can respectively provide early warning information for the vehicle or other vehicles based on the road environment information, which belongs to active prevention, but does not consider passive protection in the event of a rear-end collision once the prevention warning does not work.

At the same time, the above three mainstream technologies ignore the influence of road conditions on the braking distance when monitoring the relative distance, relative speed and running state of the two vehicles.

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