Abstract:

In order to understand the typical pedestrian vehicle collision scenarios and accident characteristics after the vehicle is equipped with the automatic emergency braking system （AEB）， 187 accidents are reproduced and the parameters before the collision are collected. Then the effect of the traditional AEB system is evaluated using the combined simulation technology. After 73 accidents （39%） that are not avoided are analyzed with statistical methods， 6 typical types of pedestrian vehicle collision scenarios that are not avoided are obtained. The study shows that the accidents that are not avoided mainly occurr at non-intersections with good lighting conditions and dry road， and the collision speed is lower than 40 km/h in 95.88% cases. The pedestrian vehicle collision injury is significantly reduced， with different reduction magnitude in different scenarios. Uncertainty exists in the reduction of pedestrian ground collision injury， and 61.9% of the cases in typical scenarios have an increased risk of pedestrian ground collision injury， with the proportion of injury increase varying with the change of collision scenarios. Further analysis shows that the main reasons for the increase of pedestrian ground collision injuries are the change of pedestrian landing sequence after AEB reduces the speed， the re-contact of pedestrian lower limbs with the front end of the vehicle， and the change of pedestrian vehicle collision position. The research results can not only provide boundary conditions for the experimental design of intelligent vehicle owners and passive safety research， but also provide support for the design of safer AEB systems.

Key words: vehicle pedestrian collision, automatic emergency braking system, accident reconstruction, traffic accident scenario, pedestrian-ground contact injury