Research On The Key Techniques Of Bus Signal Coordinated Optimization

With the development of rapid urbanization and motorization,the number of private vehicle increases immoderately,and the traffic congestion problem become serious day by day.Developing public transport vigorously with priority is the key measure of solving the traffic congestion problem.As a consequence,promoting the quality and attraction of the public transport is very necessary.Aiming at the defects in the present bus signal control coordinated,combining with development needs and technical characteristics in modern urban traffic control,this dissertation has researched and discussed in the following areas,including the formation of bus,the selecting of the coordinated path set of the bus network,the building of bus routes coordinated control model,the synchronization coordinated control method of buses and social vehicles.The main scientific research and research results in this dissertation include:1)A kind of the bus passenger OD collection method of bus station was put forward.The dwell time control model oriented to the platoon formation was built,and the solving of the model was realized by programming.The dynamic boarding guidance method was proposed,so as to provide passengers with personalized real-time guidance when passengers choosing boarding bus route.The dwell time of each bus route are balanced by distributing the amount of boarding passengers of each route in the same arriving bus platoon.The the bus platioon is maintaining when buses going through the station so that the technical base is founded for realizing the bus platoon coordinated control between upstream and downstream intersections.2)In the selecting of intersection coordinated object in bus route,the concepts of coordinated route,coordinated route chain and coordinated path set were introduced.Aiming at the coordinated characteristics of adjacent intersections in bus route,the bus route relevancy calculating model was built in consideration ofmain relevancy affecting factors,the distance between adjacent intersections and the bus station OD by way of the bus route.The judging criterial for bus coordinated path is proposed.The equivalent transformation method was putward,so as to resolve the bus route signal coordinated control problem into the set of several arterial traffic signal coordinated problems in coordinated path chains.Therefore,the signal coordinated control algorithm can be simplified.3)Combining with the advantages and disadvantages of existing green wave coordinated control methods,the basic thought of the improved algebraic method was presented.The bus green wave coordinated control algebraic calculation model was built.The optimal signal timing parameters were determined by seeking the ideal intersection positions that closely match the actual intersection positions.Different arterial travelling direction both can obtain bus green wave bandwidths as wide as possible.The automatic solving program of the algorithm was developed so that the rapid solving of optimal scheme was realized.4)Aiming at the difficulty in the unification of the arriving intersection moment of buses and social vehicles,the buses and social vehicles synchronization control model was established.The arriving moment of buses and social vehicles can be made approximate by adjusting the common cycle and phase sequence of intersections.It can ensure multistrand travel flows acquire favourable green wave coordinated control effect.The the benefits of buses and social vehicles are balanced,and the overall control efficiency is promoted.