Research On Green Wave Coordinated Control Method Based On Combinational Optimization Of Road Speed And Signal Timing

With the wisely application of modern urban green wave coordination control technology,the design of signal coordinated control scheme based on fixed green wave speed is gradually difficult to meet the actual traffic demand.So with the development of speed detection,guidance and control technology,it is necessary to achieve a more effective optimization method of speed and signal to meet the requirements of urban traffic development.When the signal coordination scheme is designed,the fixed green wave speed is unable to match the actual traffic state in real time,and limits the passivity of the road as well as the optimized space of the regional green wave coordinated control.So the research of the vehicle speed will become a focus on intelligent signal coordination control in future.In this regard,this study conducted research on green wave coordinated control method based on combinational optimization of road speed and signal timing,under the unsaturated traffic state.The main research work completed is summarized as follows:1)The theory of traffic green wave coordinated control facing urban road network is analyzed.With the study of the connection between green wave speed,signal timing and road spacing,a road speed design method for the bidirectional artery green wave coordination control is proposed.According to the green wave speed between the upstream intersection and the reference intersection,and the section speed requirement,the retrieval of the green wave speed between the intersection and the reference intersection is determined.And vehicle speed variance is used as the evaluation index of driving comfort.By the optimization design of the green wave speed,the integrated maximization of the vehicle speed is realized.And feasibility of the method is verified with example solving and simulation experiment.Result shows that the method can reduce the average stops at the intersection and the travel time effectively.In the same time,by taking the comfort of driving into account,the speed fluctuation of green wave design between different intersections is as small as possible,which ultimately improves the passivity of the coordinated artery.2)Considering the lack of the existing regional green wave coordination control model,the advantage and application of the speed optimization are analyzed,and the green wave speed optimization method for the segment of the regional coordination control is proposed.According to the minimum requirements of average stops and average delay time,the weighted sum of green wave reduction rate and the vehicle speed reduction rate is used.By exploring the impact of the different weight coefficients under specific network structures,a regional green wave coordinated control model based on cooperative optimization of vehicle speed and traffic signal is finally established.By introducing the optimization of green wave speed,the optimized space of regional green wave coordination control is expanded,which guarantees that the network has a good overall green wave coordinated control effect,and the vehicle speed is increased.The combined optimization of the vehicle speed,phase sequence,offset and common signal cycle is realized.The results of example solving and simulation experiments show that the optimal design obtained by the model is fully optimized for the speed,phase,offset and the signal cycle.A desirable green wave bandwidth and green wave speed in straight direction can be achieved,meaning a significant effect of regional green wave coordinated control.3)In response to the problem of low solving speed of the regional green wave coordination control model,and considering the advantages of strong operational performance and dimension reduction by using algebraic for the artery coordinated control problem,an algebraic method for regional green wave coordinated control design is proposed.By classifying the intersections into the absolute benchmark intersection,relative benchmark intersection,and non-benchmark intersection,the stepby-step design of regional green wave coordinated control is realized based on the algebraic method.By analyzing the offset difference of non-benchmark intersections,the deviations ideal-actual spacing,and their joint influence on green wave bandwidth,the principle of designing offset for non-benchmark intersections is proposed.The bias split is used as the evaluation index of regional green wave coordination effect,and finally the complexity of the algorithm is analyzed.Through theoretical analysis and example solution,the algebraic method can effectively reduce the calculation complexity and the solving speed is greatly improving,which ensuring the overall green wave coordination optimization effect.In addition,based on the algebraic method,the extension of speed optimization can further increase the green wave bandwidth in a short time and thereby reduces the stops and delay time.It illustrates that the algorithm can not only ensure the overall regional green wave coordination effect,but also improve the solution efficiency,so that it has a significant advantage for large-scale network green wave coordinated control design.