Pump controlled hydraulic actuators offer higher energy efficiency than valve controlled actuators. However, there exists mode switching in pump controlled systems and instability may arise when a single rod cylinder is implemented. This paper examines the problem of system stability in a pump controlled system with single rod cylinders. It is shown that the system dynamics have a stable tendency or an instable tendency corresponding to different cylinder movements. The paper shows system instability can be avoided by controlling fluid leakage, and two applicable methods are presented: physical leakage compensation and virtual leakage compensation, which can be applied depending on applications. Experiments and numerical simulations are presented. Results show that the proposed solutions can maintain circuit stability: physical leakage compensation can be a general approach while virtual leakage compensation offers higher energy efficiency and lower cost, but its applications are limited by some factors.
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November 2013
Research-Article
Using Leakage to Stabilize a Hydraulic Circuit for Pump Controlled Actuators
Wayne J. Book
Wayne J. Book
e-mail: wayne.book@me.gatech.edu
Georgia W. Woodruff School
of Mechanical Engineering,
Georgia W. Woodruff School
of Mechanical Engineering,
Georgia Institute of Technology
,Atlanta, GA 30332
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Longke Wang
e-mail: longke.wang@gatech.edu
Wayne J. Book
e-mail: wayne.book@me.gatech.edu
Georgia W. Woodruff School
of Mechanical Engineering,
Georgia W. Woodruff School
of Mechanical Engineering,
Georgia Institute of Technology
,Atlanta, GA 30332
Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received February 3, 2012; final manuscript received June 22, 2013; published online August 23, 2013. Assoc. Editor: Won-jong Kim.
J. Dyn. Sys., Meas., Control. Nov 2013, 135(6): 061007 (12 pages)
Published Online: August 23, 2013
Article history
Received:
February 3, 2012
Revision Received:
June 22, 2013
Citation
Wang, L., and Book, W. J. (August 23, 2013). "Using Leakage to Stabilize a Hydraulic Circuit for Pump Controlled Actuators." ASME. J. Dyn. Sys., Meas., Control. November 2013; 135(6): 061007. https://doi.org/10.1115/1.4024900
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