交通信息与安全2024，Vol.42Issue(2)：95-104,10.DOI:10.3963/j.jssn.1674-4861.2024.02.010
考虑智能网联汽车通信延时的混合交通流稳定性分析
A Stability Analysis of Mixed Traffic Flows Considering Communication Delay of Connected and Autonomous Vehicles
摘要
Abstract
In traffic systems,minor disturbances can significantly destabilize traffic flow and cause vehicles to ex-hibit frequent start-stop problem.This study aims to identify disturbance suppression techniques for mixed traffic flows,taking into account the issue of communication delay of connected and autonomous vehicle(CAV).To study the influence mechanism of vehicle communication on the stability of mixed traffic flows,a comprehensive analysis of multiple factors such as the delay of communication among CAV,the market penetration of CAV and the platoon-ing intensity is conducted.Considering the impact of maximum size of CAV platooning,a stability analysis model of mixed traffic flows is constructed based on Markov chain,which can derive the generation probability of differ-ent headway types.On such basis,the stability identification formula of mixed traffic flows is developed to analyze the stable speed range under different conditions.In order to improve the efficiency of communication among CAV,the roadside units are used to transmit information.According to the different directions of vehicle-road communica-tion,the communication process is divided into uplink communication from vehicle-to-road and downlink communi-cation from road-to-vehicle.Next,the communication delay estimation model under low traffic density is devel-oped,based on which the communication delay under different CAV penetrations and its platooning intensities to an-alyze its impact on traffic flow stability.To validate the analytical results,simulation experiments of disturbance evo-lution are conducted.The results indicate that:①The market penetration of CAV and its platooning intensity are beneficial to the stability of mixed traffic flow.②Communication delay has a negative impact on the stability of mix traffic flow.In detail,the delay decreases with the increase of the market penetration of CAV and its platooning intensity,the coverage of roadside units and CAVs'communication radius.③When the maximum size of CAV pla-toon equaling 6 and the steady speed of mixed flow travels equaling 25 m/s,only when the market penetration of CAV reaches 60%or its platooning intensity is greater than 0.5,can the delay be less than 0.3 s and the disturbance be effectively suppressed.关键词
交通工程/V2X/通信延时/混合交通流/稳定性Key words
traffic engineering/V2X/communication delay/mixed traffic flow/stability analysis分类
交通工程引用本文复制引用
张璐,张兆磊,刘至真,唐峰..考虑智能网联汽车通信延时的混合交通流稳定性分析[J].交通信息与安全,2024,42(2):95-104,10.基金项目
国家自然科学基金青年项目(52302385)、湖南省重点研发计划项目(2023SK2052)资助 （52302385）
