Research On Coordinated Control Of Main Line With Variable Speed Guidance Under Vehicle-Road Cooperation

With the continuous acceleration of the pace of urbanization in my country,the capacity of urban traffic network has become saturated or even oversaturated,and the contradiction between the continuous growth of traffic demand and traffic resources is becoming more and more prominent,and the normalized road congestion will increase the number of urban roads.traffic pressure.In the urban road network,the key to improving the traffic efficiency of arterial vehicles is how to coordinate and reduce the time for vehicles to pass through the intersection.mouth speed.When a certain intersection is congested,the traffic fluctuation of a small section of the road will have a partial impact on the rest of the traffic,and then affect the traffic at the upstream intersection.At present,most of the urban traffic signal control in our country adopts the timing coordination control of arterial lines or the signal control method of manual switching during morning and evening peak hours,which can easily increase the risk of motor vehicles passing through the intersection twice,and the signal timing scheme can no longer adapt to the real-time urban traffic.,high efficiency,integrity and other development needs.However,in recent years,the research of vehicle-road coordination is booming,and the research results are gradually taking shape.It is possible for motor vehicles to drive through intersections at variable speeds.Taking the vehicle-road coordination environment as the background,this article aims to study a theoretical method of variable speed guided arterial coordination control.First of all,this paper briefly introduces the basic theoretical knowledge related to trunk coordination,mainly to learn the traditional calculation methods of the basic parameters,evaluation indicators and control methods of trunk coordination.Secondly,by learning the classic two-way green wave coordinated control model(MAXBAND model)and its improved optimization model,considering that there are some intersections with small traffic flow and simple traffic flow types in the field survey,this kind of The actual signal period of the intersection becomes half of the common period,which can form a two-period green wave coordinated control method.This thesis deduces the equality constraints suitable for such intersections according to the green wave time distance diagram,as well as the inequality constraints to ensure that the left and right edges of the green wave belt are within the green light period,and improve the deficiencies in the current research results.Aiming at a specific intersection,taking the maximization of the sum of the two-way weighted green wave bandwidth as the research goal,a dual-period green wave coordinated control model suitable for the arterial coordinated control is constructed.On this basis,for the motor vehicles traveling in the coordinated direction of the arterial line,combined with the road traffic operation information and speed guidance,a dual-period green wave coordinated control method based on acceleration and deceleration guidance is proposed.The calculation formula of the theoretical value range and the actual value range of the acceleration guide speed or deceleration guide speed in the downward direction.Finally,this study will take the trunk line system composed of 5 related intersections of Optics Valley 1st Road in Wuhan City as an example,program the secondary development API interface of TESS NG simulation software through Visual C++2017,and build a signal intersection under vehicle-road coordination.Velocity-guided simulation environment.And the TESS NG micro-simulation platform is used to simulate the actual traffic road conditions of the Optics Valley No.1 Road.The timing schemes of the trunk line signals before and after the optimization of the Optical Valley No.1 Road are simulated respectively,and the two-cycle coordinated control guided by the optimized vehicle speed is simulated in real time.Finally,By analyzing and comparing the output traffic evaluation index results such as travel time,driving delay and queue length,it verifies the rationality and practicability of the dual-period green-wave coordinated control and speed-guided dual-period green-wave coordinated control method established in this paper.