Abstract: The conception , construction and main functions of the safety early warning system are introduced in this paper .On the basis of this , how to utilize the system to avoid actively traffic accident is discussed further .The mathematic model of safe distance and its application are also studied in this paper

Key words: automobile , warning system , active safety , longitudinal collision avoidance

摘要： 介绍了汽车行驶危险预警系统的组成及其子系统的功能，讨论了如何运用该系统实现汽车行驶时的几种危 险预警的主动安全性能，并探讨了安全车距的数学模型及其在系统中的应用

关键词: 汽车, 预警系统, 主动安全, 纵向防撞