Certain types of Load-sensing (LS) pumps utilize a hydro-mechanical control system designed to regulate the pressure difference, or margin pressure, between the inlet and outlet of a flow control valve. With a constant margin pressure, predictable flow control can be achieved by controlling the orifice area of the flow control valve. In this work, the stability of the pressure control system will be investigated. A combination of linear analysis and nonlinear analysis is employed to assess the stability of a particular LS pump system. Among many nonlinearities present in the hydro-mechanical system, of particular interest is the saturation inherent in the actuator that is used to displace the pump swash plate and the saturation within the 3-way spool valve that permits flow to reach the actuator. This saturation nonlinearity has been isolated from the rest of the system to enable stability analysis. Analysis of model characteristics is used to make conclusions about the stability of the system consisting of interconnected linear and nonlinear portions. The stability analysis is compared to results obtained through a simulation study using a nonlinear model based on first principles.
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ASME/BATH 2014 Symposium on Fluid Power and Motion Control
September 10–12, 2014
Bath, United Kingdom
Conference Sponsors:
- Fluid Power Systems and Technology Division
ISBN:
978-0-7918-4597-4
PROCEEDINGS PAPER
Modeling and Stability of a Hydraulic Load-Sensing Pump With Investigation of a Hard Nonlinearity in the Pump Displacement Control System
Zachary D. Wagner,
Zachary D. Wagner
University of Missouri, Columbia, MO
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Roger Fales
Roger Fales
University of Missouri, Columbia, MO
Search for other works by this author on:
Zachary D. Wagner
University of Missouri, Columbia, MO
Roger Fales
University of Missouri, Columbia, MO
Paper No:
FPMC2014-7802, V001T01A001; 12 pages
Published Online:
November 20, 2014
Citation
Wagner, ZD, & Fales, R. "Modeling and Stability of a Hydraulic Load-Sensing Pump With Investigation of a Hard Nonlinearity in the Pump Displacement Control System." Proceedings of the ASME/BATH 2014 Symposium on Fluid Power and Motion Control. ASME/BATH 2014 Symposium on Fluid Power and Motion Control. Bath, United Kingdom. September 10–12, 2014. V001T01A001. ASME. https://doi.org/10.1115/FPMC2014-7802
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