A challenge in realizing switch-mode hydraulic circuits is the need for a high-speed valve with fast transition time and high switching frequency. The work presented includes the design and modeling of a suitable valve and experimental demonstration of the prototype in a hydraulic boost converter. The design consists of two spools driven by crank-sliders, designed for 120 Hz maximum switching frequency at a flow rate of 22.7 lpm. The fully open throttling loss is designed for <2% of the rated pressure of 34.5 MPa. The transition time is less than 5% (0.42 ms at 120 Hz) of the total cycle and the duty cycle is adjustable from 0 to 1. Leakage and viscous friction losses in the design are less than 2% of the rated hydraulic energy per cycle. The experimental results agreed well with the model resulting in a 3% variation in transition time. The use of the high-speed valve in a pressure boosts converter demonstrated boost ratio capabilities of 1.08–2.06.
Design of a Crank-Slider Spool Valve for Switch-Mode Circuits With Experimental Validation
Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received January 3, 2017; final manuscript received November 2, 2017; published online December 22, 2017. Assoc. Editor: Heikki Handroos.
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Koktavy, S. E., Yudell, A. C., and Van de Ven, J. D. (December 22, 2017). "Design of a Crank-Slider Spool Valve for Switch-Mode Circuits With Experimental Validation." ASME. J. Dyn. Sys., Meas., Control. June 2018; 140(6): 061008. https://doi.org/10.1115/1.4038537
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