A hybrid control scheme for freeway systems

Abstract The development of a hybrid control scheme for freeway systems is the objective of the paper. A finite number of models is defined, each relevant to a specific traffic condition. The system state variables are the differences between the traffic density and the traffic mean speed in each section and their desired values. A receding–horizon (RH) regulator is defined for each model being the control variables the traffic volumes at on–ramps. A hybrid control scheme is proposed, which is composed of two control levels. The first control level consists of a finite class of models and RH control functions. The second level acts as a supervisor that chooses the best model and control law to be applied to the plant according to the present system state and possible external events. The application of the proposed control scheme makes it possible to guarantee some suitable stability properties of the origin as an equilibrium point of the system considered at the first control level.

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