Analysis by Simulation of Different Control Algorithms of A Digital Hydraulic Two-Actuator System

Authors

  • Matti Karvonen Tampere University of Technology, Department of Intelligent Hydraulics and Automation, P.O. Box 589, FI-33101 Tampere, Finland
  • Mikko Heikkilä Tampere University of Technology, Department of Intelligent Hydraulics and Automation, P.O. Box 589, FI-33101 Tampere, Finland
  • Mikko Huova Tampere University of Technology, Department of Intelligent Hydraulics and Automation, P.O. Box 589, FI-33101 Tampere, Finland
  • Matti Linjama Tampere University of Technology, Department of Intelligent Hydraulics and Automation, P.O. Box 589, FI-33101 Tampere, Finland

DOI:

https://doi.org/10.1080/14399776.2014.893710

Keywords:

digital hydraulic valve, Digital Hydraulic Power Management System, efficiency

Abstract

Many hydraulic systems have losses, which could be avoided with new technology. Because component efficiency can be optimized to a certain operation point, hydraulic machines are no worse than other machines. More important than the peak efficiency values of each individual component in a system is the efficiency of the whole power transfer line. In a system where the amount of required power and the velocity/force ratio are variables, components may but seldom operate at their optimal design points. A typical approach to mobile work hydraulics is to use a load-sensing pump for a hydraulic multi-actuator system. This approach is efficient but seldom, if many actuators are used simultaneously. Our recent prototype of an improved hydraulic power supply system is the Digital Hydraulic Power Management System (DHPMS), which can serve many actuators at optimised supply pressure but is also capable of motoring and transforming. This functionality holistically reduces losses in the system. Losses can be further reduced by using distributed valve systems with sophisticated control algorithms together with the DHPMS. In this study, we used digital hydraulic valves, which efficiency strongly depends on the control algorithms used. We studied here different control methods for a system with two actuators, a DHPMS, and digital valves.

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Author Biographies

Matti Karvonen, Tampere University of Technology, Department of Intelligent Hydraulics and Automation, P.O. Box 589, FI-33101 Tampere, Finland

Matti Karvonen (Born 20th July 1984) started as a research assistant at the Tampere University of technology (TUT) at fall of 2007 and took degree of M.Sc (Tech.) in June of 2009. Since then he has been working as a researcher in the digital hydraulics research group. Topic of his ongoing PhD (Tech.) studies are supported by the doctoral programme of TUT’s president. Main research area considers digital hydraulic solutions in MIMO-systems. Another major research area has been miniature valves.

Mikko Heikkilä, Tampere University of Technology, Department of Intelligent Hydraulics and Automation, P.O. Box 589, FI-33101 Tampere, Finland

Mikko Heikkilä (Born 8th September 1983) has been a member of the digital hydraulic research group since 2008. He graduated as M.Sc. (Tech) at Tampere University of technology (TUT) in 2009 and is currently working on his doctoral thesis with the support of the Doctoral Program in Concurrent Mechanical Engineering (DPCME). His research work relates to energy efficient displacement controlled digital hydraulic systems.

Mikko Huova, Tampere University of Technology, Department of Intelligent Hydraulics and Automation, P.O. Box 589, FI-33101 Tampere, Finland

Mikko Huova (Born 28th June 1982) graduated as M.Sc. (Tech) at Tampere University of technology (TUT) in 2008. Work with control algorithms of digital hydraulic systems started before his graduation at the Department of Intelligent Hydraulics and Automation (IHA). He is continuing the research work as Ph.D. student and focuses on energy saving control algorithms of digital hydraulic systems. His studies are supported by the doctoral programme of TUT’s president.

Matti Linjama, Tampere University of Technology, Department of Intelligent Hydraulics and Automation, P.O. Box 589, FI-33101 Tampere, Finland

Matti Linjama Adjunct Professor Matti Linjama has worked 18 years at TUT and his major research topic has been digital hydraulics since 2000. He is leader of the digital hydraulics research group and has published 50+ scientific publications about the topic.

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Published

2018-12-29

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