关键词: 超声波雷达；行人检测；空气弹簧；预测碰撞；行人保护；发动机舱盖；智能弹起

Abstract: In traffic accidents, pedestrians' heads hit hard spots under the engine canopy, causing many casualties. In view of this situation, the intelligent ejection device of the engine canopy designed by the system is composed of ultrasonic radar, engine canopy, front cover front rotating shaft, front axle switch lock, rear axle rotating shaft, rear axle switch lock, air spring and other parts. In the event of a pedestrian collision, the control system controls the rear axle switch lock to open, the front axle switch lock to close, and the air spring to bounce up the rear end of the engine canopy, which cushions the pedestrians from impacting, avoiding the pedestrian's head from hitting the hard point under the engine and reducing casualties. After the release of the air spring, it can be pressurized again, so that the engine canopy intelligent bounce device can be reused, the maintenance cost is low, the pedestrian distance is detected by ultrasonic radar, and the collision analysis is carried out in combination with the speed of the car, which can predict the collision in advance and play a more timely protection effect.

Key words: Ultrasonic radar; Pedestrian detection; Air springs; Predictive collisions; Pedestrian protection; Engine canopy; Intelligent bouncing