Journal of Transportation Systems Engineering and Information Technology ›› 2022, Vol. 22 ›› Issue (1): 37-48.DOI: 10.16097/j.cnki.1009-6744.2022.01.005

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A Molecular Dynamics-based Car-following Model for Connected and Automated Vehicles Considering Impact of Multiple Vehicles

ZONG Fang1 , WANG Meng1 , HE Zheng-bing* 2   

  1. 1. College of Transportation, Jilin University, Changchun 130022, China; 2. College of Metropolitan Transportation, Beijing University of Technology, Beijing 100124, China
  • Received:2021-10-16 Revised:2021-11-10 Accepted:2021-11-24 Online:2022-02-25 Published:2022-02-22
  • Supported by:
    National Natural Science Foundation of China(61873109)

考虑多车影响的分子动力学智能网联跟驰模型

宗芳1,王猛1,贺正冰* 2   

  1. 1. 吉林大学,交通学院,长春 130022;2. 北京工业大学,城市交通学院,北京 100124
  • 作者简介:宗芳(1979- ),女,吉林长春人,教授,博士。
  • 基金资助:
    国家自然科学基金

Abstract: The car- following control of connected and automated vehicles (CAV) is studied under mixed traffic flow with regular vehicles. Considering the factors of velocity, headway, and the velocity and acceleration difference of multiple front and rear vehicles, this paper constructed a car- following model for CAVs by using the molecular dynamics to express the impacts of different surrounding vehicles on the host one. The car-following process of CAVs was then described when driving in the traffic mixed with CAVs and regular human- driving vehicles. The results of stability analysis show that, compared with the full speed difference model, the proposed model is more conducive to improving the stability of traffic flow due to the consideration of multiple front and rear vehicles' information. The simulation results indicate that, compared with the Cooperative adaptive cruise control (CACC) model provided by PATH laboratory, the average maximum error of our model is reduced by 0.19 m/s, the average error is reduced by 26.79%, and the fitting accuracy is improved by 0.91%. Besides, in the traffic flow mixed with CAV and RV, with the increase of CAV penetration, the average velocity of the platoon and volume increase gradually. The results of Hysteresis loops show that compared with the Full Velocity Difference (FVD) model, the stability of traffic flow under the CAV model in this paper is better. The proposed model can serve as an effective method for CAV control under both homogeneous traffic flow or heterogeneous flow mixed with CAVs and human- driving vehicles. Under the situation that it is difficult to carry out the field test of heterogeneous flow mixed with CAVs and human-driving vehicles, this study provides a theoretical basis and model support for vehicle control as well as infrastructure planning and design.

Key words: traffic engineering, traffic simulation, molecular dynamics, connected and automated vehicle, multiple front and rear vehicles, stability analysis

摘要: 为研究含智能网联汽车(Connected and Automated Vehicle, CAV)和人工驾驶汽车(Regular Vehicle, RV)混行交通流下CAV跟驰行为的控制问题,考虑前后多车的速度、车头间距、速度差、 加速差等参数,采用分子动力学定量表达不同周边车辆对主体车的影响,得到可用于描述CAV在 混行交通流中的跟驰过程。稳定性分析结果表明,与全速度差模型相比,本文提出的考虑前后多车信息的CAV跟驰模型有利于提高交通流的稳定性。数值仿真与模型验证结果表明,与PATH 实验室的CACC(Cooperative Adaptive Cruise Control)模型相比,本文建立的CAV跟驰模型平均速度最大误差减小了0.19 m∙s-1 ,平均误差减小26.79%,拟合精度提高了0.91%。同时,在CAV和 RV组成的混行交通流中,随着CAV比例的逐渐增加,车队的平均速度和交通流量逐渐增加。迟滞回环曲线表明,与全速度差(Full Velocity Difference, FVD)模型相比,本文提出的CAV模型控制下的交通流稳定性更强。该模型可用于同质流或CAV与人工驾驶车辆等混行环境下的CAV跟驰控制,在目前开展混行实车实验困难的情况下,为混行交通流场景下的车辆控制及交通设施规划设计提供理论依据和模型支持。

关键词: 交通工程, 交通仿真, 分子动力学, 智能网联汽车, 前后多车, 稳定性分析

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