Report

ELEN 6778 APPLY NETWORK TECH/PHYSCL SYST Professor Nicholas F. Maxemchuk Liyan Sun Objective To improve the delay time in vehicles By using Graph Theory and Fuzzy control method Compared with the traditional control of time-fixed Outline Introduction Analysis of Traffic Control System Graph Theory Analyze the Regulation by using Fuzzy Control Conclusion (Simulation Result) Outline Introduction At present, the control of fixed conversion time is widely used in each intersection traffic light in urban. For single intersection, we usually uses timing control scheme, which is based on the historical data of the traffic flow, artificially distributed the traffic light time in N-S and E-W direction in advance. Outline Introduction However, actual observation indicates that the vehicle flux is unbalanced between highs and lows of the traffic flow. Fuzzy control can control the random and complex urban traffic effectively as it doesn’t need to build accurate mathematical model. Outline– Fuzzy Control Intersection Models Effective Adjusting Model The Phase Diagram Phase Diagram (in our project) Outline---Design The Design of Vehicle Sensor Control Strategy The Design of Fuzzy Controller Simulation Result Detail---Control Strategy Li (i=a,b,…,f), represents the present number of vehicles in the driveway Traffic queues(N), in the test area which are on traffic Waiting queues(W), in other lanes which are waiting detected The design of Fuzzy Controller 2 inputs and 1 output Inputs: Access Queue Length N and Waiting Queue Length W Output: Green Light Time T Comment Sets {NB(very little), NS(a little), ZE(medium), PS(many), PB(a great many)} The design of Fuzzy Controller The design of Fuzzy Controller Membership Function Curve The Control Rules of T Based on expert’s experience and repeatedly debugging Simulation Result Thank You