Abstract
The use of on/off solenoid operated hydraulic valves instead of proportional valves has been attracting the interest of many researchers and engineers. However, there exist difficulties in controlling the on/off valve because of highly nonlinear characteristics including hysteresis and saturation. This paper considers the application of on/off solenoid operated hydraulic valves to control position of a hydraulic cylinder with the aim of evaluating, feasibility and practicability of their implementation and understanding the potential benefits when they are used in existing hydraulic systems. Assuming that only the current is measured, a sliding mode observer is designed to estimate the spool position and velocity. To alleviate the aforementioned difficulties in controlling the spool position, a nonlinear observer-based controller of an on/off solenoid valve is designed, taking into account the estimated values, based on a nonlinear model including hysteresis and saturation. The control objective is to track a desired spool trajectory. Simulation and experimental results illustrate the efficiency of the designed controller. The proposed controller is validated again in a single-rod hydraulic actuator. Experimental results show that the fluid flow through the valve orifice by controlling the spool position was successfully controlled.
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Recommended by Associate Editor Jae Cheon Lee
Myeong-Kwan Park received the M.S. and Ph.D. from Tokyo Institute of Technology, Tokyo, Japan, in 1988 and 1991, respectively, in Mechanical Engineering. He is currently a full professor with Department of Mechanical Engineering and a Researcher in the Research Institute of Mechanical Technology at Pusan National University. His research interests are in hydraulic and smart fluid such as magnetic fluid, ER fluid and MR fluid.
Jae-Hak Lee received the B.S in Mechanical Engineering from University of Ulsan, Ulsan, Korea, in 2009, and his M.S. in Mechanical Engineering from Pusan National University, Busan, Korea, in 2011. He is currently working toward his Ph.D. at Pusan National University. His research interests are in hydraulic and smart fluid control such as magnetic fluid and MR fluid.
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Lee, JH., Yun, YW., Hong, HW. et al. Control of spool position of on/off solenoid operated hydraulic valve by sliding-mode controller. J Mech Sci Technol 29, 5395–5408 (2015). https://doi.org/10.1007/s12206-015-1141-7
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DOI: https://doi.org/10.1007/s12206-015-1141-7