Study On Adaptive Control Method For A Single Intersection

This paper takes a single intersection as research object. Through the study of the adaptive signal control methods for a single intersection, it's expected to improve the performance of a single control. This paper studies on the two methods respectively, the optimization based method and the fuzzy logic based method. Then a new method is proposed and tested by the simulation test. Also, the inclement weather adaptive traffic signal control is analyzed and researched.Firstly, the optimization based method is studied. A new multi-object signal timing model which meets the different traffic demands is proposed and solved using genetic algorithm. This model can select different performance indexes according to different traffic conditions. Under the low flow ratio conditions, it selects delay and stops as the performance index; under the high flow ratio conditions, it selects capacity and delay as the performance index. So the signal timing is more reasonable.Secondly, the fuzzy logic based method is studied. The traditional fuzzy controller is implemented. Then changeable phase fuzzy controller is studied and applied to the low flow conditions in the night. The simulation test compares the performance between the GA optimization based control, the traditional fuzzy control and the changeable phase fuzzy control. The simulation test shows the multi-object signal timing model based on GA optimization method has better performance compared with fixed timing. Especially under the high flow ratio conditions, it can improve the capacity of the intersection efficiently. The changeable phase fuzzy control method proves to be very efficient for the intersection with changeable traffic flow.Thirdly, the inclement weather adaptive traffic signal control is analyzed. The inclement weather includes rain, snow, fog and so on which has a lot impact on the roads and the traffic. So the research is quite significant. And there is some research and some applications in the foreign countries. Through summarizing the current research conditions in the foreign countries, it's expected to provide some enlightenment for the future research.In the end, summarizing the whole work, and pointing out some content which would be researched in the future.