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.
Using Leakage to Stabilize a Hydraulic Circuit for Pump Controlled Actuators
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.
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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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