This paper presents a hierarchical hybrid system modeling and simulation framework using the Ptolemy II environment. Ptolemy II is a system-level design tool that supports the integration of multiple models of computation. The modeling of hierarchical hybrid systems is achieved by combining continuous-time models with finite state automata. Breakpoint handling, event detection and invariant monitoring techniques are studied. A hybrid helicopter control system is simulated as an example.
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Liu et al. (1999) studied this question.
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