车辆事故自动呼救系统车载终端设计

Design of vehicle terminal for automatic crash notification system

为弥补传统车辆事故自动呼救(ACN)系统车载终端无可视化界面、提供信息不足等缺点,设计出一种新型ACN系统车载终端。详细阐述车载终端的功能需求和总体设计,以及事故检测模块和呼救信息发送模块的模块初始化及工作流程;事故检测模块的功能包括加速度信号和图像信号的采集与存储,呼救信息发送模块可提取地理信息并显示和发送呼救信息。台车碰撞模拟试验的结果表明,车载终端能够准确采集包含更多预测成员伤害程度的有效信息和车内图像,计算碰撞速度变化量、最大碰撞加速度,发送呼救信息,且可视化界面工作正常。

Traditional vehicle terminals of ACN system have no visual interface and information they send out is not sufficient to enable an emergency center to predict the injury condition of occupants. In order to cover these shortages,a vehicle terminal of ACN system with a visual interface was developed. Structure of the vehicle terminal and programs for functional modules including initialization and working process were elaborated. A sled impact simulation test was carried out. After a crash happens,an image of occupants is taken and stored,the crash information is calculated,the location information is collected and a notification message is sent to an emergency center automatically. And results show that vehicle terminal collects impact acceleration signals and an image precisely,calculates the change of velocity accurately,sends out a notifying message successfully and visual interface works normally. Therefore,vehicle terminal realizes the function of notifying and sends out a message which contains more effective information that can predict the injury condition of occupants.