Autors: Kralev, J. K., Mitov, A. S., Slavov, T. N.
Title: Robust µ-controller for hydraulic spool valve, pilot operated with switching micro valves
Keywords: Electro-hydraulic spool valve; Micro valves; Robust control; Uncertain system identification

Abstract: Hydraulic spool valve, pilot operated with bi-state switching micro valves is a low-cost alternative to the conventional proportional and high-response valves. However, high-frequency switching causes variations in the control flow which limits achievable spool tracking error. This paper presents the design of a robust µ-controller for the spool position reference tracking synthesized with D-K iterative procedure. Furthermore, in order to reduce wind-up effects in the closed-loop, the µ-controller is decomposed to a canonical observer and state feedback components which allows explicit introduction of the saturated control signal in the controller equations. The uncertainty model required for the µ-synthesis is inferred from the nonlinear hydraulic model by identification of a Box– Jenkins model set characterized by its parameter covariance matrix. The regulator is implemented in a 32-bit programmable logic controller (PLC) and its performance is experimentally verified..

References

    Issue

    Energies, vol. 14, issue 16, 2021, Switzerland, Multidisciplinary Digital Publishing Institute (MDPI), DOI 10.3390/en14164817

    Copyright Multidisciplinary Digital Publishing Institute (MDPI)

    Вид: статия в списание, публикация в издание с импакт фактор, публикация в реферирано издание, индексирана в Scopus и Web of Science