• Enrique Busquets Purdue University, Department of Mechanical Engineering, 225 S. University St., West Lafayette, Indiana 47907, USA
  • Monika Ivantysynova Purdue University, Department of Mechanical Engineering, 225 S. University St., West Lafayette, Indiana 47907, USA


displacement control, excavator, heat transfer, thermodynamics


A promising technology for the advancement of fluid power systems is displacement controlled (DC) actuation. The main advantage of DC actuation is that metering losses are completely eliminated by replacing each actuator’s proportional valve with a variable displacement pump and controlling the actuator motion by pump displacement. This technology can achieve up to 50 % energy savings when compared to the conventional load sensing (LS) systems and the elimination of metering losses in DC systems is directly translated in lower heat generation. This paper presents a model to predict the thermodynamic behavior of multi-actuator displacement controlled machines. A complete mathematical model has been developed based on conservation of mass and energy. The model characteristics are discussed for an excavator, which contains four variable displacement pumps, three single-rod actuators, a rotary actuator for the slew, a gear pump, an accumulator, a heat exchanger, a reservoir, as well as metallic hydraulic lines and switching valves; however, the model has been created to be able to simulate not only the presented hydraulic circuit but different ones including those for larger off highway vehicles. Simulation results for measured working cycles of the excavator are presented and compared with measured temperatures of the machine. The simulation/measurement agreement demonstrates the validity and usefulness of the model.


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Author Biographies

Enrique Busquets, Purdue University, Department of Mechanical Engineering, 225 S. University St., West Lafayette, Indiana 47907, USA

Enrique Busquets received his B.S. degree in Mechanical Engineering from the University of Texas at El Paso in 2011. Since then he has worked as a graduate researcher/PhD student at Purdue University in the development of highly efficient displacement controlled systems for multi-actuator systems. His research interests include the thermal-hydraulic behavior analysis of hydraulic systems.

Monika Ivantysynova, Purdue University, Department of Mechanical Engineering, 225 S. University St., West Lafayette, Indiana 47907, USA

Monika Ivantysynova Born on December 11th 1955 in Polenz (Germany). She received her MSc. Degree in Mechanical Engineering and her PhD. Degree in Fluid Power from the Slovak Technical University of Bratislava, Czechoslovakia. After 7 years in fluid power industry, she returned to university. In April 1996 she received a Professorship in fluid power & control at the University of Duisburg (Germany). From 1999 until August 2004 she was Professor of Mechatronic Systems at the Technical University of Hamburg-Harburg. Since August 2004 she is Professor in Mechanical Engineering and Agricultural and Biological Engineering at Purdue University, USA. She was approved as Maha named Professor in Fluid Power Systems and director of the Maha Fluid Power Research Center at Purdue University in November 2004. Her main research areas are energy saving actuator technology and model based optimization of displacement machines as well as modeling, simulation and testing of fluid power systems. Besides the book “Hydrostatic Pumps and Motors” published in German and English, she has published more than 90 papers in technical journals and at international conferences.


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