Control and Performance Analysis of a Digital Direct Hydraulic Cylinder Drive

Authors

  • Niels H Pedersen Department of Energy Technology, Aalborg University, Aalborg, Denmark
  • Per Johansen Department of Energy Technology, Aalborg University, Aalborg, Denmark https://orcid.org/0000-0001-8010-283X
  • Lasse Schmidt Department of Energy Technology, Aalborg University, Aalborg, Denmark https://orcid.org/0000-0002-8002-1287
  • Rudolf Scheidl Institute of Machine Design and Hydraulic Drives, Johannes Kepler University, Linz, Austria
  • Torben O. Andersen Department of Energy Technology, Aalborg University, Aalborg, Denmark

DOI:

https://doi.org/10.13052/ijfp1439-9776.2032

Keywords:

Digital Displacement Machines, Hydraulics, Fluid Power, Direct Drive, Control, Energy Efficient

Abstract

This paper concerns control of a digital direct hydraulic cylinder drive (D-DHCD) and is a novel concept with the potential to become the future solution for energy efficient hydraulic drives. The concept relies on direct control of a differential cylinder by a single hydraulic pump/motor unit connected to each cylinder inlet/outlet. The pump/motor unit in this research uses the digital displacement technology and comprises of numerous individually digital controlled pressure chambers, such that the ratio of active (motoring, pumping or idling) chambers determines the machine power throughput. This feature reduces energy losses to a minimum, since the inactive (idling) chambers has very low losses. A single DDM may provide individually load control for several cylinders without excessive throttling due to various load sizes. Successful implementation of the concept relies on proper control of the DDM, which demands a dynamical model that allows for system analysis and controller synthesis. This is a challenging task, due to the highly non-smooth machine behavior, comprising both non-linear continuous and discrete elements. This paper presents the first feedback control strategy for a D-DHCD concept, based on a discrete dynamical approximation and investigates the control performance in a mathematical simulation model representing the physical system.

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Author Biographies

Niels H Pedersen, Department of Energy Technology, Aalborg University, Aalborg, Denmark

Niels H. Pedersen received the B.Sc. and M.Sc. degrees in mechatronic control engineering from Aalborg university in 2013 and 2015, respectively. He received the Ph.D. degree also from Aalborg University in 2018 for his research and development of control strategies for digital displacement units. In 2019 he moved to R&D Engineering Solutions and Consulting A/S.

Per Johansen, Department of Energy Technology, Aalborg University, Aalborg, Denmark

Per Johansen received the B.Sc. and M.Sc. degrees in electromechanical systems engineering and the Ph.D. degree in mechanical engineering, for his studies in tribodynamic modeling, all from the Aalborg University, Aalborg, Denmark in 2009, 2011, and 2014, respectively. Since 2014, he has been at the Department of Energy Technology, Aalborg University, where he now holds the position as Associate Professor. His main research interests include Fluid power and mechatronic systems, Tribotronics, Active tribology control methods.

Lasse Schmidt, Department of Energy Technology, Aalborg University, Aalborg, Denmark

Lasse Schmidt received his M.Sc. and Ph.D degrees in Mechanical Engineering from Aalborg University, Denmark, in 2008 and 2014, respectively. From 2008 to 2010 he has been with the application engineering department, Bosch Rexroth A/S, Denmark, and from 2010 to 2013 he did his Ph.D in cooperation with the same company. From 2014 to 2015 he has been a Postdoctoral Researcher at the Department of Energy Technology at Aalborg University, Denmark, concurrently being with the Engineering Application department at Bosch Rexroth AG, Lohr am Main, Germany. From 2015 to 2017 he has been an Assistant Professor at the Department of Energy Technology at Aalborg University, Denmark, and since 2017 an Associate Professor at the same department. His research interests are related to control theory as well as design and control of electro-hydraulic drives, actuators and systems. He has published research papers in international journals and conference proceedings.

Rudolf Scheidl, Institute of Machine Design and Hydraulic Drives, Johannes Kepler University, Linz, Austria

Rudolf Scheidl, Born November 11th 1953 in Scheibbs (Austria). MSc of Mechanical Engineering and Doctorate of Engineering Sciences at Vienna University of Technology. Industrial research and development experience in agricultural machinery (Epple Buxbaum Werke), continuous casting technology (Voest Alpine Industrieanlagenbau), and paper mills (Voith). Since Dec. 1990 Full Professor for Mechanical Engineering at the Johannes Kepler University Linz. Research topics: hydraulic drive technology and mechatronic design.

Torben O. Andersen, Department of Energy Technology, Aalborg University, Aalborg, Denmark

Torben O. Andersen, since 2005 professor at the Department of Energy Technology, Aalborg University. Head of section: Fluid Power and Mechatronic System. Worked at Danfoss, R&D, as project manager and university coordinator. Research areas covers: control theory, energy usage and optimization of fluid power components and systems, mechatronic system in general, design and control of robotic systems and modelling and simulation of dynamic systems. Head of research programs relating development of a hydrostatic transmission for wind turbines and wave energy converters, and offshore mechatronic systems for autonomous operation and condition monitoring. Author and co-author of more than 250 scientific papers in international journals and conference proceedings.

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Published

2020-03-09

How to Cite

Pedersen, N. H., Johansen, P., Schmidt, L., Scheidl, R., & Andersen, T. O. (2020). Control and Performance Analysis of a Digital Direct Hydraulic Cylinder Drive. International Journal of Fluid Power, 20(3), 295–322. https://doi.org/10.13052/ijfp1439-9776.2032

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