@inproceedings{0df7e755c43b472a80fdf81766d1c5c1,
title = "Modeling and validation of a high speed rotary PWM on/off valve",
abstract = "Efficient high-speed on/off valves are a critical technology for enabling digital control of hydraulic systems via pulse-width-modulation (PWM). High-speed valves, when used in virtually variable displacement pumps (WDP), increase system bandwidth and reduce output pressure ripple by enabling higher PWM frequencies. Our approach to achieving high speed and large flow area with low actuation power is a unidirectional rotary valve designed specifically for PWM. In comparison to conventional valves, the rotary valve reduces valve actuation power from a cubic dependence on PWM frequency to a square dependence by eliminating motion reversals during transition. This paper presents experimental data that validates the rotary valve concept, valve design equations, and dynamic model of a rotary-valve based WDP. Our unoptimized prototype exhibits 65% efficiency at 50% displacement and 15Hz PWM frequency while the validated model projects that an optimized valve is capable of achieving 85% efficiency at 15Hz and 73% at 75Hz.",
author = "Tu, {Haink C.} and Rannow, {Michael B.} and Meng Wang and Li, {Perry Y.} and Chase, {Thomas R.}",
year = "2010",
doi = "10.1115/DSCC2009-2763",
language = "English (US)",
isbn = "9780791848920",
series = "Proceedings of the ASME Dynamic Systems and Control Conference 2009, DSCC2009",
publisher = "American Society of Mechanical Engineers (ASME)",
number = "PART A",
pages = "629--636",
booktitle = "Proceedings of the ASME Dynamic Systems and Control Conference 2009, DSCC2009",
edition = "PART A",
note = "2009 ASME Dynamic Systems and Control Conference, DSCC2009 ; Conference date: 12-10-2009 Through 14-10-2009",
}