A Hydraulic Pressure-Boost System Based on High-Speed On–Off Valves

A novel hydraulic pressure-boost system utilizing high-speed On-Off valves is studied in this paper. The hydraulic pressure-boost system is analogous to a boost converter in power electronics. High pressure is achieved by braking a hydraulic motor with inertia flywheel through the high-speed On-Off valve. The high pressure is stabilized by a hydraulic capacitor set at the motor output. The steady state and fluctuation characteristics of the pressure-boost system are studied. Research shows that the output pressure is always higher than system pressure and it increases with the duty ratio of pulse width modulation (PWM) signal supplied to the high-speed On-Off valve. It also shows the output pressure fluctuation is greatly influenced by the PWM signal frequency and the oil chamber volume. The hydraulic pressure-boost system was built and tested. It successfully boosted the system pressure from 50 to 116 bar at the PWM signal duty ratio of 0.7. The success of the experiment brings a new way to boost hydraulic pressure.

[1]  Aaas News,et al.  Book Reviews , 1893, Buffalo Medical and Surgical Journal.

[2]  Kyoung Kwan Ahn,et al.  Saving energy control of cylinder drive using hydraulic transformer combined with an assisted hydraulic circuit , 2009, 2009 ICCAS-SICE.

[3]  Linyi Gu.  NEW HYDRAULIC SYSTEMS MADE UP OF HYDRAULIC POWER BUS AND SWITCHMODE HYDRAULIC POWER SUPPLIES , 2003 .

[4]  Kyoung Kwan Ahn,et al.  Intelligent switching control of pneumatic actuator using on/off solenoid valves , 2005 .

[5]  J. Leavitt,et al.  Accurate Sliding-Mode Control of Pneumatic Systems Using Low-Cost Solenoid Valves , 2007, IEEE/ASME Transactions on Mechatronics.

[6]  Zhao Fu,et al.  The Innas Hydraulic Transformer The Key to the Hydrostatic Common Pressure Rail , 2000 .

[7]  Song Liu,et al.  Automated onboard modeling of cartridge valve flow mapping , 2006, IEEE/ASME Transactions on Mechatronics.

[8]  P.A.J. Achten,et al.  Transforming future hydraulics : a new design of a hydraulic transformer , 1997 .

[9]  Jianlong Zhang,et al.  Nonlinear Model-Based Control of Pulse Width Modulated Pneumatic Servo Systems , 2006 .

[10]  Bin Yao,et al.  Coordinate Control of Energy-Saving Programmable Valves , 2003 .

[11]  Gem Vael,et al.  A four-quadrant hydraulic transformer for hybrid vehicles , 2009 .

[12]  W. Marsden.  I and J , 2012 .

[13]  Feng Wang,et al.  Switchmode Hydraulic Power Supply Theory , 2005 .

[14]  George T.-C. Chiu,et al.  Adaptive robust motion control of single-rod hydraulic actuators: Theory and experiments , 1999, Proceedings of the 1999 American Control Conference (Cat. No. 99CH36251).

[15]  Rudolf Scheidl,et al.  TWO BASIC CONCEPTS OF HYDRAULIC SWITCHING CONVERTERS , 2012 .

[16]  R Scheidl,et al.  The role of resonance in elementary hydraulic switching control , 2003 .

[17]  Linyi Gu,et al.  A continuously variable hydraulic pressure converter based on high-speed on–off valves , 2011 .

[18]  Darwin G. Caldwell,et al.  Power hydraulics - switched mode control of hydraulic actuation , 2010, 2010 IEEE/RSJ International Conference on Intelligent Robots and Systems.

[19]  Peter A. J. Achten,et al.  Valving Land Phenomena of the Innas Hydraulic Transformer , 2000 .

[20]  M. Q. Le,et al.  Comparison of a PWM and a hybrid force control for a pneumatic actuator using on/off solenoid valves , 2010, 2010 IEEE/ASME International Conference on Advanced Intelligent Mechatronics.

[21]  Rudolf Scheidl,et al.  Switching type control of hydraulic drives: A promising perspective for advanced actuation in agricultural machinery , 2000 .

[22]  Rudolf Scheidl,et al.  Basics for the Energy-Efficient Control of Hydraulic Drives by Switching Techniques , 1995 .

[23]  Bin Yao,et al.  Energy-saving adaptive robust motion control of single-rod hydraulic cylinders with programmable valves , 2002, Proceedings of the 2002 American Control Conference (IEEE Cat. No.CH37301).

[24]  Rudolf Scheidl,et al.  Modelling of a Switching Control Hydraulic System , 2005 .

[25]  Darwin G. Caldwell,et al.  Energy Efficient Fluid Power in Autonomous Legged Robotics , 2009 .