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Sliding mode observer for nonlinear uncertain systems. (English) Zbl 1003.93007
A smooth nonlinear uncertain control system is considered. It is assumed that the uncertainties are representable through unknown input terms of the system. Based on suitable assumptions, the original system is decomposed into two interconnected subsystems (one of these subsystems is free of uncertainties). A nonlinear sliding mode observer is proposed to provide the state estimates for the other subsystem (in which the unknown inputs only appear). Some simulation results corresponding to a three-phase current motor model are also presented.
MSC:
93B12Variable structure systems
93C10Nonlinear control systems