Reference Trajectory Based Quasi-Sliding Mode with Event-Triggered Control

Katarzyna Adamiak and Andrzej Bartoszewicz
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Katarzyna Adamiak: Institute of Automatic Control, Łódź University of Technology, 18 Bohdana Stefanowskiego Street, 90-537 Łódź, Poland
Andrzej Bartoszewicz: Institute of Automatic Control, Łódź University of Technology, 18 Bohdana Stefanowskiego Street, 90-537 Łódź, Poland

Energies, 2021, vol. 14, issue 21, 1-13

Abstract: The study presents a novel event-triggered quasi-sliding mode control algorithm for linear discrete time systems. The problem is divided into two main parts. Firstly, the sliding mode control of perturbed discrete time systems is considered. In order to limit the impact of external disturbances to one sampling step only, a reference trajectory-based control law is introduced. The proposed control method drives the system’s representative point to an a priori designed reference position in each control step, thus minimizing the influence of disturbance and improving the robustness. Moreover, the reference trajectory is generated according to a novel reaching law, which ensures the nonswitching movement within the quasi-sliding mode band. In the latter part of the study, the proposed control strategy is supplemented with an event-triggering algorithm. In the modified strategy the control signal is only updated when a certain triggering condition occurs. Therefore, the need for communication between system elements is reduced. As follows, the delays in the digital control process may be reduced as well, without compromising the system’s robustness.

Keywords: control design; discrete time systems; event-triggering; reaching law approach; sliding mode control; reference trajectory generator (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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