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How to handle auxiliary functions in energy efficient, single pump, flow sharing mobile systems
Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology. (Flumes)ORCID iD: 0000-0002-6371-1390
Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology. (Flumes)
2010 (English)In: 7th International Fluid Power Conference Aachen: Efficiency Through Fluid Power, Workshop Proceedings, Vol. 1 / [ed] Hubertus Murrenhoff, Aachen: Apprimus Wissenschafts Verlag , 2010, Vol. 1, 65-78 p.Conference paper (Refereed)
Abstract [en]

Interest has increasingly shifted from load-sensing (pressure controlled) systems to flow controlled systems. In this paper an interesting configuration that uses pre-compensated valves with flow sharing properties is studied. The fundamental difference between a traditional load sensing (LS) system and a flow controlled system is that the pump is controlled based on the operator’s total flow demand rather than maintaining a certain margin pressure over the maximum load pressure. One of the main advantages with flow controlled systems is the absence of the feedback of the highest load pressure to the pump. Flow controlled systems also present some challenges, one being how to handle auxiliary functions with unknown flow demands. Auxiliary functions are typically support legs, external power takeouts etc. This paper analyses one kind of flow controlled system and shows one way of dealing with auxiliary functions.

Place, publisher, year, edition, pages
Aachen: Apprimus Wissenschafts Verlag , 2010. Vol. 1, 65-78 p.
Keyword [en]
fluid power, load sensing, flow control, energy efficiency
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-58146ISBN: 978-39-4056-590-7OAI: diva2:332358
The 7th International Fluid Power Conference, 22th- 24th March, Aachen, Germany
Available from: 2010-08-04 Created: 2010-08-04 Last updated: 2015-08-31Bibliographically approved
In thesis
1. Mobile Fluid Power Systems Design: with a Focus on Energy Efficiency
Open this publication in new window or tab >>Mobile Fluid Power Systems Design: with a Focus on Energy Efficiency
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This work deals with innovative energy efficient fluid power systems for mobile applications. The subjects taken up concern to what extent and how energy losses can be reduced in mobile working hydraulics systems. Various measures are available for increasing energy efficiency in these kinds of systems. Examples include:

Flow controlled systems The pump controller is switched from a load sensing toa displacement controlled one. The displacement is controlled in an open loopfashion directly from the operator’s demand signals. This reduces energy consumptionat the same time as dynamic issues that are attached to LS systemscan be avoided.

Individual metering valve systems Flexibility is increased by removing the mechanicalcoupling between the meter-in and meter-out orifices in directionalvalves. An overview of this kind of system is given in the thesis. A designproposal that has been implemented is also presented. Initial test results areshown. Patents for this particular system have been applied for.

Displacement control Metering losses are reduced by removing the directional valves.One pump is used for each load in such systems. This hardware layout involvesconsiderable changes compared to conventional systems. Displacementcontrolled systems are not studied in this work.

In mobile applications, overall efficiency is often poor and losses are substantial. The measures listed above can help improve this significantly in such applications. A flow dividing system can decrease energy consumption by about 10% and an individual metering system by about 20%. Losses in pump controlled systems are difficult to give a figure for; the losses are rather attached to the pumps and motors and not to the system layout. However, the losses for these systems are presumably even lower than for individual metering systems. The main focus in this work is on individual metering systems but questions about which components and so on are also treated. For example, the Valvistor valve concept has been studied as part of this work.


Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2010. 77 p.
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1339
National Category
Engineering and Technology
urn:nbn:se:liu:diva-61362 (URN)978-91-7393-304-9 (ISBN)
Public defence
2010-11-19, Planck, Fysikhuset, ing°ang 57, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Available from: 2010-11-16 Created: 2010-11-16 Last updated: 2015-08-31Bibliographically approved

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