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This brief investigates the hybrid observer design for a class of nonlinear switched systems in which the discrete part is governed by a Petri net. The proposed hybrid observer represents a combination of a continuous observer based on the second-order sliding mode approach and a discrete one based on an unknown input observer. An illustrative example ends this brief and shows the efficiency of the...
This paper addresses the problem of observer design for a class of switched system, where the discrete state evolution is led by a Petri net. This class may have modes in which the state is not fully observable. A new hybrid observer composed of a discrete and a switched continuous parts in interaction is proposed. The discrete part is based on Unknown Input observer to reconstruct the discrete state...
This paper addresses the problem of fault diagnosis in discrete event systems (DES) modeled by Petri nets with outputs, i.e., Petri net (PN) with place sensors and transition sensors. The PN is used in order to give a functional and dysfunctional modeling of the system studied. In the dysfunctional modeling, places represent the failure mode and transitions represent the conditions that led a system...
In this paper we address both problem of discrete state and firing sequences estimation for Discrete Event Systems (DES) modeled by Petri nets(PN). We present a new and simple method to construct an Unknown Input observer for DES modeled by PN by using traditional methods for descriptor systems. The proposed observer is designed in order to estimate both the marking places and the firing vector of...
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