Research On City Traffic Arterial Coordinated Signal Control In Intelligent Connected Vehicle Mixed Traffic Environment

With the increasing number of motor vehicles and trips on China’s urban traffic roads,the contradiction between supply and demand between transportation infrastructure and traffic demand is prominent,and the traffic safety,traffic congestion and environmental pollution of urban traffic trunk lines have intensified.With the development of a new generation of intelligent transportation technology and network technology,there will be a variety of mixed vehicles of different intelligent network levels on urban traffic roads in the future,so the efficiency of the main trunk line in the intelligent networked vehicle environment can determine the overall traffic experience of the city.Based on this background and technology,this paper does the following main work for the research on the coordinated control of urban traffic trunk lines in the mixed environment of intelligent networked vehicles:Firstly,the theory and method of coordinated control of traditional urban traffic trunk lines are analyzed,and then the technical system framework of urban road traffic control system in the intelligent network environment is expounded,and the theoretical basis of coordinated control of urban traffic trunk lines in the intelligent network environment is summarized and analyzed.Secondly,the traffic operation data related to artificial driving vehicles and networked manually driven vehicles are obtained through driving simulation experiments,the key parameters of mixed traffic flow between manually driven vehicles and networked manually driven vehicles are analyzed and calibrated,and an improved NaSch model based on safe following speed is established;Combined with the characteristics of mixed traffic flow of intelligent networked vehicles,the vehicle formation strategy and internal following rules of the fleet are proposed;Based on the coordinated control of the fleet at single-point intersections,the coordinated control model of urban traffic trunk lines in the mixed traffic environment of intelligent networked vehicles is established through dynamic speed guidance and signal optimization methods;Taking the overall delay and the number of stops of trunk coordinated control as the goal,the optimization target model of coordinated trunk line control is determined,and the exhaustive method is selected to solve it.Finally,SUMO traffic simulation software is used to build a simulation experimental environment,and based on the mixed traffic flow environment of intelligent networked vehicles,the intersection timing signal control,MAXBAND control method and trunk line coordination control method proposed in this paper are compared and analyzed.The results show that the average delay time and average number of stops of vehicles under the control model established in this paper are reduced by 48.2% and 56.8% compared with the timing control method,and by 25.5%and 38.5% compared with the MAXBAND coordinated control method,respectively.Therefore,the coordinated control method of urban traffic trunk line based on dynamic speed induction and signal optimization of vehicle formation can effectively improve the operation efficiency of mixed traffic flow of intelligent networked vehicles at each intersection of the main line,which has a good application effect and has important reference significance for the intelligent management and control of urban traffic trunk lines in the future.