Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (2): 405-412.doi: 10.13229/j.cnki.jdxbgxb20210680

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Fundamental diagram model of mixed traffic flow of connected and automated vehicles considering vehicles degradations and platooning intensity

Rui-fa LUO1(),Hui-jun HAO2,Tao-rang XU2,Qiu-fan GU2   

  1. 1.Key Laboratory of Road and Traffic Engineering，Ministry of Education，Tongji University，Shanghai 201804，China
    2.School of Transportation and Logistics，Southwest Jiaotong University，Chengdu 610031，China
  • Received:2021-07-16 Online:2023-02-01 Published:2023-02-28

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Abstract:

With the development and popularization of connected and automated vehicles（CAVs）， the traffic flow on the road will transition to a mixed traffic flow composed of CAVs and human-driven vehicles （HDVs） for a long period of time in the future. To reveal the relationship among the flow， density， and speed of mixed traffic flow， a fundamental diagram model of mixed traffic flow in connected automated vehicle environment is established， taking into account CAVs degradations and platooning intensity as the starting point. First， different types of vehicles after CAVs degradations are simulated by using specific car-following models. The proportion of different types of vehicles under the influence of platooning intensity is determined. Based on this， the fundamental diagram model is derived and established which considers both vehicles degradations and platooning intensity. This makes up for the shortcomings of existing studies that do not fully consider the two aspects. What's more， it makes the model more suitable for the actual situation of mixed traffic flow. Finally， the SUMO simulation experiment is designed to verify the theoretical conclusions. The results show that the flow-density scatter points obtained by simulation in different scenarios are consistent with the corresponding theoretical curves， which verifies the correctness of the theoretical model established in this paper.

Key words: connected and automated vehicles, mixed traffic flow, fundamental diagram model, vehicles degradations, platooning intensity

CLC Number: 

  • U463.6

Fig.1

Car-following situations in mixed traffic flow"

Fig.2

Schematic diagram of platooning intensity"

Fig.3

Fundamental diagram under different p1 when platoon intensity is 0"

Fig.4

Consistency between simulation scatter points and the theoretical curve under different permeability of CAVs"

Fig.5

Consistency between simulation scatter points and the theoretical curve under different platoon intensity"

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