Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (2): 469-477.doi: 10.13229/j.cnki.jdxbgxb.20220990

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Lane⁃changing model of autonomous vehicle in weaving area of expressway in intelligent and connected mixed environment

Wei-hua ZHANG(),Jia-ming LIU,Li-peng XIE,Heng DING()   

  1. School of Automotive and Transportation Engineering,Hefei University of Technology,Hefei 230009,China
  • Received:2022-08-08 Online:2024-02-01 Published:2024-03-29
  • Contact: Heng DING E-mail:weihuazhang@hfut.edu.cn;dingheng@hfut.edu.cn

Abstract:

In a mixed traffic environment composed of connected and autonomous vehicles (CAV) and human-driven vehicles (HV), a CAV free lane change dynamic control model is proposed to improve the running state of the expressway weaving area. Firstly, by introducing driving style parameters and optimizing HV multi-level lane changing strategy, the HV numerical simulation model of expressway weaving area is constructed, and the constructed model is verified according to different lane changing ratios and lane changing position distribution. Combined with CAV permeability and parameters of lane changing, a CAV dynamic control model of free lane change is proposed. Finally, the influence of CAV dynamic control model on traffic efficiency and safety is analyzed under the condition of CAV permeability random distribution. The results show that the dynamic control model can further improve the traffic efficiency and safety in the weaving area under the condition of low CAV permeability, and the improvement effect of the dynamic control model gradually decreases with the increase of permeability.

Key words: traffic engineering, weaving area of expressway, mixed traffic flow, lane change model, numerical simulation

CLC Number: 

  • U491.2

Table 1

Parameter value of IDM model"

参数取值
δ4
L/m5
s0/m2
T/s1.5
amax/(m·s-21
bmax/(m·s-22
vref,i(t)/(km·h)120

Table 2

Parameter value of CACC model"

参数取值
k11.0
k20.2
k33.0
tg0.6

Fig.1

Distribution characteristics of HV lane change in weaving area"

Table 3

Comparison table of driving styles and lane changing types"

驾驶风格可能采取的换道类型
谨慎型自由型
稳健型自由型、风险Ⅰ型
激进Ⅰ型自由型、风险Ⅰ型、风险Ⅱ型
激进Ⅱ型自由型、风险Ⅰ型、风险Ⅱ型、强制型

Table 4

Frequency of lane change and error of four types of lane change"

换道类型换道次数比例/%误差/%
自由型196365.130.37
风险Ⅰ型81126.901.43
风险Ⅱ型1856.142.00
强制型551.802.26

Fig.2

Cumulative proportion of lane change"

Fig.3

CAV lane change type diagram of weaving area"

Fig.4

ATT variation diagram of weaving area"

Fig.5

TET variation diagram of weaving area"

Fig.6

ATT index under different control modes"

Table 5

Improvement of traffic efficiency by dynamic control model"

μ效率改善/%
0.13.03
0.22.01
0.31.26
0.40.64
0.50.22

Table 6

Difference between the highest point and the lowest point in ATT index"

μ动态控制无控制
0.11.702.23
0.20.871.18
0.30.750.87
0.40.710.83
0.50.620.60

Fig.7

TET index under different control modes"

Table 7

Safety improvement failure location of dynamic control"

μ失效位置/m
0.1320
0.2315
0.3295
0.4290
0.5200
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