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Time-delay systems: an overview of some recent advances and open problems. (English) Zbl 1145.93302

Summary: After presenting some motivations for the study of time-delay system, this paper recalls modifications (models, stability, structure) arising from the presence of the delay phenomenon. A brief overview of some control approaches is then provided, the sliding mode and time-delay controls in particular. Lastly, some open problems are discussed: the constructive use of the delayed inputs, the digital implementation of distributed delays, the control via the delay, and the handling of information related to the delay value.

MSC:

93-02 Research exposition (monographs, survey articles) pertaining to systems and control theory
93C23 Control/observation systems governed by functional-differential equations
93B12 Variable structure systems
34K20 Stability theory of functional-differential equations
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