NDLI: Hierarchical digital control of a proportional electro-hydraulic valve

Content Provider	IEEE Xplore Digital Library
Author	Canuto, E. Acuna-Bravo, W.
Copyright Year	2013
Description	Author affiliation: Dipt. di Autom. e Inf., Politec. di Torino, Turino, Italy (Canuto, E.; Acuna-Bravo, W.)
Abstract	Proportional electro-hydraulic valves are ubiquitous as flow actuators in hydraulic systems. Flow regulation is the result of the accurate positioning of a spool driven by a solenoid and a position sensor. The overall control consists of two hierarchical loops: the inner loop is the solenoid current regulator with a closed-loop bandwidth close to 1 kHz. The outer loop is a position tracking control, in charge of an accurate positioning of the spool with respect to the valve openings. The paper addresses the outer loop and concentrates on the conversion of an industrial analogue controller into a digital one. The analogue controller is a nonlinear proportional, integrative and derivative controller including a second-order derivative, and is capable of recovering a dead-band hysteresis. The digital conversion provides the necessary derivatives through a state predictor, in order to withstand the 5-kHz Nyquist limit of the power supplier. The digital control law is fed by state predictions and repeats the analogue control law with some improvement. Preliminary experiments prove that the conversion repeats and improves analogue performance. Some flaws of the resulting digital controller are outlined and discussed in view of a model-based conversion.
Starting Page	1015
Ending Page	1020
File Size	859341
Page Count	6
File Format	PDF
ISBN	9781467355575
e-ISBN	9781467355605
DOI	10.1109/ICMA.2013.6618054
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-08-04
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Delays Magnetic hysteresis Solenoids Digital control Regulators Force Valves position control Electro-hydraulics proportional valve digital control hierarchy
Content Type	Text
Resource Type	Article

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