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An Intelligent Control for Crossroads Traffic LightELEN 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
OutlineIntroduction
Analysis of Traffic Control System
Graph Theory
Analyze the Regulation by using Fuzzy Control
Conclusion (Simulation Result)
OutlineIntroductionAt 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.
OutlineIntroductionHowever, 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.
Detail---Control StrategyLi (i=a,b,…,f), represents the present number
ofvehicles in the drivewayTraffic queues(N), in the test area which are
on trafficWaiting queues(W), in other lanes which are
waiting detected
The design of Fuzzy Controller2 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)}