A model of traffic signal control systems for avoiding traffic congestion in urban road networks is proposed. The traffic signals are controlled mainly by three parameters called cycle time, split, and offset. The cycle time is a period of repeated signal cycles, the split is a ratio of green time to the cycle time, and the offset is the time difference between the beginning times of green signals at multiple intersections. Another element is lost time which means time of yellow and all red signal. In this research the split parameter is controlled. The model is constructed so that it is controllable, and disturbances of traffic flow and changes of traffic situations can be taken into account. As a result, the proposed model is described as a linear system with polytopic uncertainties. It is also shown that the way of choice state variables from links is important from the viewpoint of the controllability of the model. Next, a robust control method is applied to the proposed model so as to achieve robust stability and performance under the uncertainties. The Hinfinite control design method is presented by means of LMIs (Linear Matrix Inequality). The proposed control method gives a control law for real-time and network-wide traffic signal systems. A numerical example is given to show the effectiveness of the proposed method. One of topics for further research is to evaluate the proposed control method in more realistic traffic simulation systems.


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    Title :

    Modelling and robust control of traffic signal systems


    Additional title:

    Modellbildung und robuste Regelung von Verkehrsleitsystemen


    Contributors:
    Wakasa, Y. (author) / Iwaoka, K. (author) / Tanaka, K. (author)


    Publication date :

    2003


    Size :

    6 Seiten, 9 Bilder, 12 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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