1.3.2 Piecewise linear systemsPiecewise linear (PL) systems are studied extensively (also outside the circuit theorycommunity),becausetheyformthesimplestextensionsoflinearsystemsandmoreover,can approximate nonlinear systems with arbitrary accuracy. One of the first studieson dynamical properties of PL (discrete-time) systems are stated in [190]. SontagconsiderscontrollabilityandstabilityissuesforPLsystemsandtriestousetheobtainedtoolsandmethodsforcontrollingother, moregeneral, classesofsystems(bothdiscreteand continuous time nonlinear systems) by discrete-time PL systems. Recently, thePL-approach and other switching control schemes in the control society revives, seee.g.[17,27,38,81,104,106,134,149,204]forstabilityandcontrol,[50]forequivalenceof realizations, [118,202] for observability and controllability and [37,102] for well-posedness issues. Widely applied switching control techniques such as sliding modecontrol, gain scheduling and relay feedback [105,123] can sometimes be formulatedin PL description as well. From a more general point of view, the PL systems andswitching control architectures can be seen as subsets of the (large) class of variablestructure systems, which received quite some attention in the literature (see e.g. [68,200]).The renewed interest in PL systems in the control community motivates the studyof complementarity systems too. As piecewise linear dynamical systems allow a re-formulation in terms of complementarity systems, the results of this thesis contribute
to this research field as well.
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