|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;
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..
Copyright Multidisciplinary Digital Publishing Institute (MDPI)
1. Mihalev, G., Yordanov, S., Ormandzhiev, K., Kostov, K. and Mitev, V., 2022, October. Robust Control of Electro-Hydraulic Servo System. In 2022 International Conference Automatics and Informatics (ICAI) (pp. 218-222). IEEE. - 2022 - в издания, индексирани в Scopus или Web of Science
Вид: статия в списание, публикация в издание с импакт фактор, публикация в реферирано издание, индексирана в Scopus и Web of Science