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Energy Efficient Load Adapting System Without Load Sensing: Design and Evaluation
Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems. Linköping University, The Institute of Technology. (FluMeS)
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)
2009 (English)Conference paper, Published paper (Refereed)
Abstract [en]

In load sensing systems, the pump pressure is controlled in a closed loop control mode. In this paper, a system solution where the displacement of the pump is controlled directly from the operator's demand is studied. Both the stability and the response is thereby improved. It also implies a better energy efficiency since the pump pressure will be adapted according to the point of operation with no additional pressure margin needed. In some mobile applications, pressure compensation is required to avoid load interference. When using common pre compensators in a displacement controlled system, the pump and the valve will both control the flow. A better solution would be to control the flow by the pump and utilize the valve as a flow divider. This can be achieved by using flow sharing compensators. It also allows further energy savings since the maximum restriction area of the main spool at one of the loads can be utilized independent of the flow delivered by the pump. This paper addresses the problem with using common pre compensators in displacement controlled systems and analyses and compares both a traditional load sensing system and an open controlled pump solution with flow sharing compensators. Measurements on a wheel loader application equipped with the system presented in this paper shows a decreased energy consumption of 14 % for the working hydraulics compared to a load sensing system during a short loading cycle, provided that the pump is not saturated.

Place, publisher, year, edition, pages
Linköping, 2009.
Keyword [en]
fluid power, mobile systems, LS systems, pre compensation, energy efficiency, flow sharing
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-52691OAI: oai:DiVA.org:liu-52691DiVA: diva2:284716
Conference
11th Scandinavian International Conference on Fluid Power, SICFP'09, June 2-4, Linköping, Sweden
Available from: 2010-01-08 Created: 2010-01-08 Last updated: 2015-08-31Bibliographically approved
In thesis
1. Fluid Power Systems for Mobile Applications: with a Focus on Energy Efficiency and Dynamic Characteristics
Open this publication in new window or tab >>Fluid Power Systems for Mobile Applications: with a Focus on Energy Efficiency and Dynamic Characteristics
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis studies an innovative working hydraulic system design for mobile applications. The purpose is to improve the energy efficiency and the dynamic characteristics compared to load sensing systems without increasing the complexity or adding additional components.

The system analysed in this thesis is referred to as flow control. The fundamental difference compared to load sensing systems is that the pump is controlled based on the operator’s command signals rather than feedback signals from the loads. This control approach enables higher energy efficiency since the pressure difference between pump and load is given by the system resistance rather than a prescribed pump pressure margin. High power savings are possible especially at medium flow rates.

Furthermore, load sensing systems suffer from poor dynamic characteristics since the pump is operated in a closed loop control mode. This might result in an oscillatory behaviour. Flow control systems have no stability issues attached to the load pressure feedback since there is none.

Pressure compensators are key components in flow control systems. This thesis addresses the flow matching problem which occurs when using conventional compensators in combination with a flow controlled pump. Flow sharing pressure compensators solve this problem since the pump flow will be distributed between all active functions. A novel control approach where the directional valve is controlled without affecting the cylinder velocity with the objective of optimizing the damping is proposed.

In this research, both theoretical studies and practical implementations demonstrate the capability of flow control systems. Experiments show a reduced pump pressure margin and energy saving possibilities in a short loading cycle for a wheel loader application.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2013. 59 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1595
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:liu:diva-92578 (URN)LIU-TEK-LIC-2013:29 (Local ID)978-91-7519-600-8 (ISBN)LIU-TEK-LIC-2013:29 (Archive number)LIU-TEK-LIC-2013:29 (OAI)
Presentation
2013-05-17, ACAS, A-huset, Campus Valla, Linköpings universitet, Linköping, 10:15 (Swedish)
Opponent
Supervisors
Available from: 2013-05-22 Created: 2013-05-13 Last updated: 2013-06-25Bibliographically approved

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Axin, MikaelEriksson, BjörnPalmberg, Jan-Ove

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