摘要
设计一种有效的小型轿车智能防追尾安全距离预警系统,对有效减少交通事故发生概率具有重要意义。针对当前系统忽略了驾驶员特性和不同路面状况的影响,导致安全距离计算结果偏差较大,系统性能较差的问题,设计了一种基于驾驶员特性与路面状况的小型轿车智能防追尾安全距离预警系统,给出了临界安全距离计算公式和不同驾驶员的反应时间计算方法;根据相关参量对摩擦系数进行实时估计,确定小型轿车的合适减速度。在当前系统中添加一个路面摩擦系数实时估计单元,实时估计路面摩擦系数对小型车辆加速度的影响,改善了当前系统的问题;中央处理器可以根据行驶过程中的各种不同情况来计算防追尾安全距离,判断小型轿车行驶是否安全,如果行驶安全,则不进行操作;相反则系统发出不同等级的预警提醒驾驶员采取相应措施。利用Pc-crash仿真软件模拟工况,结果表明,初速度大,制动距离及安全距离大,路面状况从干燥、潮湿到冰雪变化时,制动距离及安全距离变的更大。
A safety distance warning system with intelligent anti - rear - end for small car based on driver charac- teristics and different road surface conditions is designed, and then the calculation formula of critical safety distance and the calculation method of reaction time for different drivers are given. Firstly, the friction coefficient was esti- mated in real time based on relevant parameters to determine the appropriate retarded velocity of small car. In the current system, we added a real - time estimation unit to estimate the influence of road surface friction coefficient on the acceleration of small car, which improved the existing system. In addition, the central processing unit calculated anti -rear- end safety distance according to different driving situations and judged whether the driving was safe. If the driving was safe, it did nothing. Otherwise, the system issued different levels of warning to remind the driver. After using Pc - crash simulation software to simulate the working condition, the results prove that the braking distance and safety distance become large when the initial velocity is high. When the road surface condition changes from dry and wet to ice and snow, the braking distance and safety distance become larger.
作者
李泽田
刘占峰
郑培
LI Ze - tian;LIU Zhan - feng;ZHENG Pei(Inner Mongolia University of Technology,College of Energy and Power Engineering,Huhehaote Inner Mongolia 010051,China)
出处
《计算机仿真》
北大核心
2018年第8期96-100,共5页
Computer Simulation
关键词
小型轿车
智能
防追尾
安全距离
预警系统
Small car
Intelligent
Anti - rear - end
Safe distance
Early warning system
