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Qualitative Modeling and Heterogeneous Control of Global System Behavior

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Hybrid Systems: Computation and Control (HSCC 2002)

Part of the book series: Lecture Notes in Computer Science ((LNCS,volume 2289))

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Multiple model approaches to the control of complex dynamical systems are attractive because the local models can be simple and intuitive, and global behavior can be analyzed in terms of transitions among local operating regions. In this paper, we argue that the use of qualitative models further improves the strengths of the multiple model approach by allowing each local model to describe a large class of useful non-linear dynamical systems. In addition, reasoning with qualitative models naturally identifies weak sufficient conditions adequate to prove qualitative properties such as stability. We demonstrate our approach by building a global controller for the free pendulum. We specify and validate local controllers by matching their structures to simple generic qualitative models. This process identifies qualitative constraints on the controller designs, sufficient to guarantee the desired local properties and to determine the possible transitions between local regions. This, in turn, allows the continuous phase portrait to be abstracted to a simple transition graph. The degrees of freedom in the design that are unconstrained by the qualitative description remain available for optimization by the designer for any other purpose.

This work has taken place in the Intelligent Robotics Lab at the Artificial Intelligence Laboratory, The University of Texas at Austin. Research of the Intelligent Robotics lab is supported in part by NSF grants IRI-9504138 and CDA 9617327, and by funding from Tivoli Corporation.

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© 2002 Springer-Verlag Berlin Heidelberg

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Kuipers, B., Ramamoorthy, S. (2002). Qualitative Modeling and Heterogeneous Control of Global System Behavior. In: Tomlin, C.J., Greenstreet, M.R. (eds) Hybrid Systems: Computation and Control. HSCC 2002. Lecture Notes in Computer Science, vol 2289. Springer, Berlin, Heidelberg.

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  • Print ISBN: 978-3-540-43321-7

  • Online ISBN: 978-3-540-45873-9

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