High bandwidth, high flow rate electrohydraulic valves typically have two or more stages. Most multi-stage valves are expensive, require meticulously clean fluid, and introduce higher order dynamics. On the other hand, single-stage spool valves are cheaper and more reliable. However, a majority of them are not suitable for high bandwidth, high flow rate applications due to limitations of the electromechanical/solenoid spool-stroking actuators. In this paper, we investigate the feasibility of reducing this limitation by exploiting the transient flow forces in the valve so as to achieve spool dynamics that are intrinsically open-loop unstable. While conventional valves are designed to be open-loop stable, the unstable valve design has to be stabilized via closed-loop feedback. Simulation case studies are conducted to examine the potential dynamic and energetic advantages that an unstable valve may offer. These studies indicate that unstable valves provide faster response than the stable counterparts when stroking forces are limited. Moreover, unstable valves tend to require less positive power and energy to operate.
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March 2002
Technical Papers
On Using Unstable Electrohydraulic Valves for Control
Kailash Krishnaswamy,
Kailash Krishnaswamy
Department of Mechanical Engineering, University of Minnesota, 111 Church St. SE, Minneapolis, MN 55455
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Perry Y. Li
Perry Y. Li
Department of Mechanical Engineering, University of Minnesota, 111 Church St. SE, Minneapolis, MN 55455
Search for other works by this author on:
Kailash Krishnaswamy
Department of Mechanical Engineering, University of Minnesota, 111 Church St. SE, Minneapolis, MN 55455
Perry Y. Li
Department of Mechanical Engineering, University of Minnesota, 111 Church St. SE, Minneapolis, MN 55455
Contributed by the Dynamic Systems and Control Division for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received by the Dynamic Systems and Control Division February 9, 2001. Associate Editor: N. Manring.
J. Dyn. Sys., Meas., Control. Mar 2002, 124(1): 183-190 (8 pages)
Published Online: February 9, 2001
Article history
Received:
February 9, 2001
Citation
Krishnaswamy , K., and Li, P. Y. (February 9, 2001). "On Using Unstable Electrohydraulic Valves for Control ." ASME. J. Dyn. Sys., Meas., Control. March 2002; 124(1): 183–190. https://doi.org/10.1115/1.1433801
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