Abstract
This paper deals with the fault diagnosis problem of the Hybrid Dynamic Systems (HDS). Generally speaking, HDS are a complex systems combining continuous and discrete behaviors that cannot be accurately modeled neither by using formalism with continuous dynamics only nor by a formalism including only discrete dynamics. We use the well-known framework of hybrid automata for modeling hybrid systems because they combine the continuous and discrete parts of the same structure. The Hybrid automaton is a states-transitions graph, whose dynamic evolution is represented by discrete and continuous alternations. The continuous evolution is performed at the automaton states, while discrete evolution is realized by transitions crossing (arcs) of the graph. Their simulation presents many problems mainly the synchronization between the two models. The proposed diagnostic models are implemented in MATLAB by using Stateflow toolbox to describe the discrete part coordinated with Matlab-Simulink for continuous part. In this paper, the different proposed models are detailed in studying a two-tank system.
Published Version
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