NDLI: Coordinate Control of Energy-Saving Programmable Valves

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Liu, Song Yao, Bin
Copyright Year	2003
Abstract	The energy-saving programmable valve, a unique combination of five independent cartridge valves, not only decouples the control of meter-in and meter-out flows but also provides the ability of precisely controlling cross-port flows for energy-saving purpose. Our previous works have already shown that the tremendous control flexibility gained by the proposed hardware re-configuration enables one not only to achieve precision control of the cylinder motion but also to decrease the energy usage significantly through actively utilizing the potential and kinetic energy of the load in accomplishing certain tasks such as smooth stopping. However, the control of such an essentially multi-input valve system to achieve the above objectives is far from trivial. In our previous works, a constant off-side pressure was assumed in the controller design for simplicity. This assumption may not be realistic in certain circumstances where the off-side pressure may vary from the assumed constant pressure significantly, especially right after the change of working mode. As a result, though the controller design is simplified, larger tracking error results during the transients. This paper presents an improved way to coordinately control the five independent valves by incorporating the off-side pressure dynamics into the controller design. The Adaptive Robust Control technique is applied to guarantee the stability and tracking performance in the presence of large system parameter variations and disturbances. Simulation and experimental results are shown to verify the much improved control performance of the presented coordinate control strategy.
Sponsorship	Fluid Power Systems and Technology Division
Starting Page	123
Ending Page	131
Page Count	9
File Format	PDF
ISBN	0791837173
DOI	10.1115/IMECE2003-42668
Volume Number	Fluid Power Systems and Technology
Conference Proceedings	ASME 2003 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2003-11-15
Publisher Place	Washington, DC, USA
Access Restriction	Subscribed
Subject Keyword	Energy consumption Stability Control equipment Valves Pressure Flow (dynamics) Stress Transients (dynamics) Design Robust control Errors Simulation Dynamics (mechanics) Hardware Kinetic energy Cylinders
Content Type	Text
Resource Type	Article

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