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Special Issue on ‘Observability and Observer Design for Hybrid Systems (ODHS2008)’ International Journal of Robust and Nonlinear Control (RNC)

Addressing significant application domains is important to gain further understanding of the implications of hybrid modelling on control algorithms and to evaluate whether using hybrid formalism can be of substantial help in solving complex, real-life, control problems. In many application domains, hybrid controller synthesis problems are addressed by assuming full hybrid state information, although in many realistic situations state measurements are not available. Hence, to make hybrid controller synthesis relevant, the design of hybrid state observers is of fundamental importance. Moreover, in many cases, e.g. in communication systems or in fault detection, algorithms for state estimation are important by themselves. Observability has been extensively studied both in the continuous and in the discrete state domains. More recently, various researchers investigated observability of hybrid systems. The definitions of observability and the criteria for assessing this property varied depending on the class of systems under consideration and on the knowledge that is assumed at the output. We believe that observability for hybrid systems is an important research topic that offers opportunities to the control community. The proposed special issue is intended to assess the state of the art for observability of hybrid systems and discuss the open problems and important trends as seen from different points of view.