考虑安全间距的合流区可变限速协调控制方法

doi:10.13229/j.cnki.jdxbgxb20210028

Abstract

Abstract:

To improve the problem of traffic congestion in merging area， the paper describes the lane changing characteristics and trajectories of vehicles in on-ramp area， the calculation model of minimum safe spacing for vehicles meeting the demand of vehicle merging is proposed. First, the calculation model is incorporated into the control framework of variable speed limit. The coordinated control method and model of variable speed limit in on-ramp area under the intelligent network environment are constructed by applying model predictive control method. Then，the simulation environment is built by using cellular automata to realize the speed control of connected vehicle in upstream control area. Finally,the ramp and main road vehicle arrival rate is set in 27 scenarios according to low， medium and high， and traffic volume， speed， density and travel time are selected as evaluation indexes. The traffic conditions of on-ramp area under control are analyzed through simulation. The simulation results show that the on-ramp vehicle arrival rate affects the implementation effect of the control strategy. When the density is low， the effect is not significant； when the density is medium， the advantage of the control strategy is reflected； when the density is high， the strategy is invalid.

Key words: engineering of communication and transportation system, variable speed limit, model predictive control, safe spacing, connected vehicle

CLC Number:

U491.4

Wen-jing WU,Yong-bin ZHAN,Li-li YANG,Run-chao CHEN. Coordinated control method of variable speed limit in on⁃ramp area considering safety distance[J].Journal of Jilin University(Engineering and Technology Edition), 2022, 52(6): 1315-1323.

Figures/Tables 13

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Table 1

Ramp entry probability pin2=0.2"

主线进车概率 $p i n 1$	控制策略	流量/（veh·h^-1）	速度/（km·h^-1）	密度/（veh·km^-1·lane^-1）	行程时间/s
0.2	ICV-NC	1 534	96.77	8.39	47 267
0.2	ICV-C	1 546	97.81	7.67	46 682
0.5	ICV-NC	2 298	91.50	12.61	68 541
0.5	ICV-C	2 323	94.76	12.27	64 385
1	ICV-NC	3 208	87.69	21.65	76 553
1	ICV-C	3 280	90.32	19.75	75 526

Table 1

Table 2

Ramp entry probability pin2=0.5"

主线进车概率 $p i n 1$	控制策略	流量/（veh·h^-1）	速度/（km·h^-1）	密度/（veh·km^-1·lane^-1）	行程时间/s
0.2	ICV-NC	2 310	91.52	9.89	53 561
0.2	ICV-C	2 477	93.91	9.21	52 688
0.5	ICV-NC	3 245	80.67	21.35	73 120
0.5	ICV-C	3 305	80.42	17.32	68 243
1	ICV-NC	3 438	66.98	37.95	86 423
1	ICV-C	3 596	71.42	32.96	85 547

Table 2

Table 3

Ramp entry probability pin2=1"

主线进车概率 $p i n 1$	控制策略	流量/（veh·h^-1）	速度/（km·h^-1）	密度/（veh·km^-1·lane^-1）	行程时间/s
0.2	ICV-NC	3 059	85.65	11.87	62 468
0.2	ICV-C	3 131	84.32	12.43	68 618
0.5	ICV-NC	3 192	61.62	29.12	106 589
0.5	ICV-C	3 254	64.84	32.62	115 695
1	ICV-NC	3 017	63.47	35.35	125 638
1	ICV-C	3 161	58.58	34.32	142 033

Table 3

Fig.8

Fig.9

Fig.10

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Coordinated control method of variable speed limit in on⁃ramp area considering safety distance

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