Design And Verification Of Intersection Intelligent Decision-Making And Traffic Guidance System Based On Cvis

The cooperative vehicle infrastructure system is an important component of the Intelligent Transportation System(ITS),which uses communication,sensing,computing and other technologies to achieve intelligent collaboration between vehicles and roadside facilities.Based on the CVIS,how to realize the coordinated control of intersections is a research focus in the field of ITS.Vehicles obtain road traffic information through the Internet of Vehicles V2 X technology and transmit them to the intersection control center in time.The intersection coordination algorithm can effectively coordinate the safe passage of vehicles through intersections to realize the Traffic Guidance System(TGS).In order to better verify the intelligent decision-making and TGS of intersections,this paper designs a simulated traffic sandbox coordination system based on the typical intersection scene in urban traffic.The system designs the overall architecture based on the principle of active guidance of vehicle road coordination,and verifies the single-segment and multi-port cooperative algorithm respectively,which has certain reference and practicability for the application research of ITS.The main contents of this paper are as follows:(1)A framework of Autonomous Intersection Management system based on CVIS is designed.The system architecture adopts the internet of vehicles layered structure design,and builds the intersection intelligent decision-making and active guidance system architecture based on software and hardware collaborative design.It is divided into three parts: overall architecture,intelligent intersection system and collaborative interaction system.Based on the traffic elements such as smart cars,traffic sandboxes and roadside communication facilities in the V2 X technology design system of the Internet of Vehicles,combined with the designed intersection algorithm,the design and development of the AIM is realized.(2)The design of the active guidance system for intersections based on the conflict table.Aiming at the traffic problem of road intersections,a conflict table is established based on the type of conflicts existing in the vehicle,and a resource lock is introduced to indicate the road occupancy status.The decision center obtains the traffic state information,analyzes whether there is a conflict route according to the established conflict table,and actively induces the conflicting vehicle.The intersection verification is carried out on the traffic sandbox,and the conflict table algorithm is applied to the intersection where the main road exists.The control center guides the speed of the vehicle to ensure that the vehicle is safely passed through the intersection.(3)The design of the AIM based on the road right allocation.For the intersection of each lane traffic flow,the road is divided into two areas to facilitate the control of the vehicle,a virtual red light is introduced,and the phase matching is calculated according to the traffic density of the road decision area.When the traffic sand table intersection is coordinated,the intelligent RSU counts the number of vehicles in the decision-making area,and the control center distributes the control flow to each vehicle to realize intelligent decision.The result shows that the intersection coordination based on the right-of-way allocation effectively improves the throughput of the intersection.(4)Multiple collaborative modeling and simulation.Based on the single intersection,the traffic state of adjacent intersections is considered.The traffic flow of the downstream intersection affects the phase alignment of the upstream intersection,which can alleviate the traffic pressure of the downstream intersection.At the same time,the design of the main road non-stop algorithm can also ensure the priority right of the main road.Based on the Unity3 D platform,a traffic network with five intersections was built to calculate the traffic flow on the two intersections in real time.According to the traffic flow,it is decided whether to limit the upstream intersection.The simulation results show that multi-junction cooperation effectively reduces the probability of traffic congestion and improves the throughput of the entire road network.