Research On Cooperative Control Strategy Of Connected Vehicles In Ramp Merging Area

In recent years,the continuous development of the Internet of vehicles provides new technical means for intelligent transportation system,vehicle collaborative decisionmaking and control,and safe and efficient transportation.However,with the gradual increase of the market penetration of Intelligent Connected Vehicles,how to give full play to the advantages of intelligent networked vehicles and achieve comprehensive collaborative control and management of vehicles is the research trend.At the same time,the complexity of the traffic environment is gradually increasing.Traffic safety and vehicles operation control are the problems that need to be studied urgently in the future traffic development,in order to meet the adaptability requirements of the sustainable development of the Internet of vehicles.As one of the key traffic bottlenecks,the efficient operation of ramp merging area is related to the operation quality of the whole road system.Using the Internet of vehicles technology,the information interaction between vehicles and roads can be realized,and the operation condition of vehicles can be improved.Therefore,based on the environment of the Internet of vehicles,this paper constructs a collaborative control strategy of vehicles in the ramp merging area,which provides an opportunity to improve the traffic efficiency of the ramp merging area.The main research contents are as follows:In this paper,firstly,the collaborative operation environment of ramp merging area under network environment was set from the road conditions,traffic conditions,network control conditions,traffic composition and other aspects.By comparing and analyzing the characteristics of different confluence forms,the suitable road form and the suitable section of ramp traffic volume under different mainline flow was selected;And this paper demonstrated the appropriate flow range of the vehicle cooperative control strategy in the ramp merging area under the networked environment;The real-time distributed control was used as the control form of ramp merging area,which was divided into free driving area,pre control area,core control area and vehicle merging area;Taking the ConnectedAutomated Vehicles and the Connected-Human Vehicles as the traffic composition objects,this paper preliminarily analyzed the influence of market penetration and the proportion of manual driving vehicles,and set the headway,arrival rate and the compliance degree of vehicle cooperative control under mixed traffic,which laid a theoretical foundation for the third chapter strategy.Then,the coordinated control strategy of networked vehicles in ramp merging area was established which ramp vehicles was the main vehicles and mainline vehicles adjusted the gap through coordinated regulation.By setting a single marshalling control unit,determining point of controllable vehicle marshalling,completion point of marshalling and merging point of vehicle merging area,ramp vehicles completed the speed increase and merging of marshalling in core control area and merging area.Taking time as the calculation target,the location interval of coordinated vehicles on the main line was determined,and the speed guidance of vehicle on the main line was adjusted to form the confluence gap.Then,the coordinated control strategy of vehicles on the ramp confluence area was established for vehicles on the ramp to confluence into the main line.Finally,the effectiveness of the cooperative control strategy of vehicles in ramp merging area was evaluated by simulation.The simulation software was used to build the network environment and vehicle operation scene,set the vehicle driving model and complete the calibration of all parameters;Combined with the simulation results,in order to improve the operation efficiency of ramp confluence area,the performance of the proposed strategy and the effect of the strategy under different market penetration were evaluated and analyzed.The results show that the coordinated control strategy of vehicles in ramp merging area greatly improves the vehicle delay optimization.At the same time,when the market penetration rate of connected vehicles is higher than 40%-60%,the optimization rate of average travel time increases faster,and the advantage of the strategy begins to be significant,and the maximum optimization rate can reach 22.42%.The research results show that the collaborative control of connected vehicle in the ramp merging area can effectively improve the merging efficiency of vehicles in the ramp merging area,alleviate the traffic congestion in the merging area,and provide some reference for the collaborative control of vehicles in the merging area in the future networked environment.