| In the complex urban traffic system,especially at the major intersections,the phenomenon of traffic congestion occurs frequently,which greatly increases the time cost of travelers.At the same time,the high density of traffic flow also increases the traffic accidents rate,which poses a great threat to people’s life and property safety.Therefore,solving the traffic problem at the intersection becomes the key to relieve the road congestion and improve the vehicle driving efficiency.Connected Vehicle as a representative product of the development of Internet of Things and mobile Internet has become an important part of modern intelligent transportation system,which is another important sign of the future wisdom urban after the Internet and the Internet of Things.Because of the technology can guide the drivers realize intelligent driving according to real-time traffic environment where the vehicles are,and help to improve the urban road traffic safety and ease congestion,which increasingly attracting the attention of scientific research and practice.Up to now,most of the studies about signalized intersections in Connected Vehicle environment are aiming at single vehicles,on the basis of the existing research,this paper fully considers the phenomenon that vehicles tend to form a vehicle queue to run together within the range of the intersection,and conducts an in-depth study on this phenomenon.Through reading a large number of domestic and foreign relevant document literature about the signal control at intersections,the vehicle platoon operation at the range of signal intersection and the guidance of speed in Connected Vehicle environment,tease out the existing relevant research results and put forward the research emphasis of this paper.The research emphasis is combined with adaptive traffic signal control method and the vehicle performance in Connected Vehicle environment,use the vehicle platoon within the scope of signal intersection as research object,and to build the speed guidance model at signalized intersection in Connected Vehicle environment.The specific research work is summarized as follows:Firstly,analyzing vehicle start-up behavior at signal intersection in Connected Vehicle environment,and to divide the vehicles head for signal intersection to vehicle platoon,on the basis of the existing vehicle platoon structure principle,in view of the traffic flow conditions under different time dimension,to research the vehicle platoon structure principle which uses the headway and instantaneous velocity as the main parameters,calibrate the two parameters of the standard headway and relative error range A of speed,and by discussing their relationship with the size of vehicle platoon,its rationality was verified.Secondly,on the basis of the complete vehicle platoon structure,considering the two kinds of factors of signal status at intersection and downstream vehicle running state,and based on a green light time variable adaptive intelligent traffic signal control system,the analysis of the entire team without a stop the boot speed requirements through the intersection,in the premise of guarantee the team maintain integrity to the intersection,in the whole passage efficiency maximization as the objective function,build the speed guidance model at signalized intersection in Connected Vehicle environment,and to realize the purpose of making the vehicle platoon through signal intersection efficiently and safely.Finally,realizing the case application of the above model through the built SUMO traffic simulation platform,and comparing the running situation of vehicles before and after speed guidance.By setting up different scenarios,and the running results of each scenario comparison analysis shows that using the proposed speed guidance model can effectively reduce the delay and queue length that the vehicle through the intersection,and greatly improve the operation stability of the vehicle platoon through signal intersection,which verifies the feasibility and validity of the speed guidance model at signalized intersection in Connected Vehicle environment that puts forward in paper. |
