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Mobile Fluid Power Systems Design: with a Focus on Energy Efficiency
Linköping University, Department of Management and Engineering, Fluid and Mechanical Engineering Systems . Linköping University, The Institute of Technology.ORCID iD: 0000-0002-6371-1390
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.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1339
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-61362ISBN: 978-91-7393-304-9 (print)OAI: oai:DiVA.org:liu-61362DiVA: diva2:370276
Public defence
2010-11-19, Planck, Fysikhuset, ing°ang 57, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2010-11-16 Created: 2010-11-16 Last updated: 2015-08-31Bibliographically approved
List of papers
1. Individual Metering Fluid Power Systems: Challenges and Opportunities
Open this publication in new window or tab >>Individual Metering Fluid Power Systems: Challenges and Opportunities
2011 (English)In: Proceedings of the Institution of mechanical engineers. Part I, journal of systems and control engineering, ISSN 0959-6518, Vol. 225, no 12, 196-211 p.Article in journal (Refereed) Published
Abstract [en]

A review of recent and current research on individual metering fluid power systems is presented. An overview of different systems and their pros and cons is given. General challenges related to independent metering fluid power systems are discussed. The major choices in the design of these systems are the hardware layout and the control strategy. The evolution of existing independent metering fluid power systems from the 1970s until the present day is also presented.

Place, publisher, year, edition, pages
Professional Engineering Publishing, 2011
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-61360 (URN)10.1243/09596518JSCE1111 (DOI)000288805000002 ()
Conference
Proceedings of the Sixth International Fluid Power Conference, IFK’08, March 31 - April 2, Dresden, Gemany
Available from: 2010-11-16 Created: 2010-11-16 Last updated: 2015-08-31
2. A High Energy Efficient Mobile Fluid Power System: Novel System Layout and Measurements
Open this publication in new window or tab >>A High Energy Efficient Mobile Fluid Power System: Novel System Layout and Measurements
2008 (English)Conference paper, Published paper (Other academic)
Abstract [en]

This is one of the earliest publications of the proposed energy efficient individual metering system shown in chapter 5, section 5.3.3. This paper introduces the novel system design, which utilizes independent meter-in and meter-out valves. This system design has the potential to increase energy efficiency considerably in a system that consists of a pump  connected to more than one fluid power actuator. The system proposed here is not dependent on pressure transducers for either flow control or mode selection. The main difference between the work presented in this paper and earlier work is the control strategy. The output signal choices in the closed loops are new. Some functionality is kept in hardware to avoid  critical sensor dependency. The presented system uses pressure compensators to achieve desired flows.

Keyword
efficiency, energy saving, mobile system, fluid power
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-42262 (URN)62135 (Local ID)62135 (Archive number)62135 (OAI)
Conference
Proceedings of the Sixth International Fluid Power Conference, IFK’08, March 31 - April 2, Dresden, Gemany
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2015-08-31Bibliographically approved
3. Energy saving system utilizing LQ-technique design
Open this publication in new window or tab >>Energy saving system utilizing LQ-technique design
2009 (English)In: Proceedings of the Seventh International Conference on Fluid Power Transmission and Control: ICPF 2009 / [ed] Yongxiang, Lu and Qingfeng, Wang and Wei, Li and Bingfeng, Ju, Beijing: Beijing World Publishing Corporation , 2009, 224-229 p.Conference paper, Published paper (Refereed)
Abstract [en]

This paper deals with the control of individual metering systems. This paper deals with the control of an individual metering system that could be used for reducing metering losses by enabling recuperation and regeneration operation. A system that utilizes individual metering is more flexible than a conventional system since there are more control signals and thereby more outputs to control. Energy saving aspects is among the main reasons for the research on this kind of system, but there is also an opportunity of improvements of the dynamics compared to a conventional system. In this paper an approach with LQtechnique are presented for improvements of system dynamics. Since all states in the system can not be measured a state observer is also considered in the control design. These work present simulations, implementations in a real world forwarder application and results from verifying experiments.

Place, publisher, year, edition, pages
Beijing: Beijing World Publishing Corporation, 2009
Keyword
fluid power, independent metering, energy savings, lq, flow amplifying poppet (fap), Valvistor, poppet valve
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:liu:diva-52028 (URN)978-775062-8213-0 (ISBN)
Conference
7th International Conference on Fluid Power Transmission and Control
Available from: 2009-11-30 Created: 2009-11-30 Last updated: 2015-08-31
4. How to handle auxiliary functions in energy efficient, single pump, flow sharing mobile systems
Open this publication in new window or tab >>How to handle auxiliary functions in energy efficient, single pump, flow sharing mobile systems
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, Published 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
Keyword
fluid power, load sensing, flow control, energy efficiency
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-58146 (URN)978-39-4056-590-7 (ISBN)
Conference
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
5. A Novel Valve Concept Including the Valvistor Poppet Valve
Open this publication in new window or tab >>A Novel Valve Concept Including the Valvistor Poppet Valve
2008 (English)In: Ventil : revija za fluidno tehniko in avtomatizacijo, ISSN 1318-7279, Vol. 14, no 5, 433-442 p.Article in journal (Other academic) Published
Abstract [en]

These days, energy efficient mobile fluid power systems are of great interest. A mobile system containing several different cylinder drives supplied with a single load sensing pump (LS-pump) has a number of advantages as well as disadvantages. One of the main advantages is the need of only one system pump. This makes the fluid power system compact and cost-effective. A challenge is to keep the hydraulic losses at low level, especially losses at smaller loads. This paper introduces a fail-safe proportional valve element that is based on the Valvistor poppet valve. Due to the demands of flexibility the poppet valve is bi-directional. The valve has an innovative hydro-mechanical layout that makes it fail-safe, unwanted lowering loads, for example, never occur. The new valve includes simple sensors that are suitable for identification of mode switches, e g between normal, differential and regenerative modes. It is also possible to maneuver the system with maintainted velocity control in the case of sensor failure. In a less complex system the concept has benefits as well. For example in systems where fail-safe-bi-directional on/off valves are needed, then without mode sensing capabilities.

Keyword
fluid power, poppet valve, Valvistor, bi-directional, fail-safe
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-43301 (URN)73431 (Local ID)73431 (Archive number)73431 (OAI)
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2015-08-31Bibliographically approved
6. The Dynamic Properties of a Poppet Type Hydraulic Flow Amplifier
Open this publication in new window or tab >>The Dynamic Properties of a Poppet Type Hydraulic Flow Amplifier
2007 (English)In: 10th Scandinavian International Conference on Fluid Power, SICFP´07 / [ed] J. Vilenius and K. T. Koskinen, Tampere, Finland: Tampere University of Technology , 2007, 161-178 p.Conference paper, Published paper (Refereed)
Abstract [en]

This paper examines the dynamic properties of a two-stage flow control valve of the "Valvistor" brand. There are several benefits to this: the valve ha a high closed loop bandwidth, the design allows big flow capacities etc. An attractive feature of this two-stage valve is that the pilot flow contributes to the total flow giving higher steady state flow efficiency. This paper presents an analythical model of this particular type of valve. A simplified model with relevant approximations is also presented. Measurements on the valve were made to validate the valve model. The paper also includes a further discussion about the pros and cons of the valve in open and closed loop applications.

Place, publisher, year, edition, pages
Tampere, Finland: Tampere University of Technology, 2007
Keyword
Fluid power, Valvistor, dynamic model
National Category
Information Science
Identifiers
urn:nbn:se:liu:diva-12538 (URN)
Conference
10th Scandinavian International Conference on Fluid Power, SICFP´07, 21st–23rd May, Tampere, Finland
Available from: 2008-09-12 Created: 2008-09-12 Last updated: 2015-08-31
7. Hopsan NG, A C++ Implementation using the TLM Simulation Technique
Open this publication in new window or tab >>Hopsan NG, A C++ Implementation using the TLM Simulation Technique
2010 (English)In: Proceedings of The 51st Conference on Simulation and Modelling (SIMS2010), Oulu, Finland, 2010Conference paper, Published paper (Refereed)
Abstract [en]

The Hopsan simulation package, used primarily for hydro-mechanical simulation, was first released in 1977. Modeling in Hopsan is based on a method using transmission line modeling, TLM. In TLM, component models are decoupled from each other through time delays. As components are decoupled and use distributed solvers, the simulation environment is suitable for distributed simulations. No numerical errors are introduced at simulation time when using TLM; all errors are related to modeling errors. This yields robust and fast simulations where the size of the time step does not have to be adjusted to achieve a numerically stable simulation. The distributive nature of TLM makes it convenient for use in multi-core approaches and high speed simulations. The latest version of Hopsan was released in August 2002, but now the next generation of this simulation package is being developed. This paper presents the development version of Hopsan NG and discusses some of its features and possible uses.

Place, publisher, year, edition, pages
Oulu, Finland: , 2010
Keyword
Hopsan, TLM, transmission lines, distributed modeling, distributed solvers
National Category
Other Computer and Information Science
Identifiers
urn:nbn:se:liu:diva-60644 (URN)
Conference
Conference of Scandinavian Simulation Society, sims’10, 14th–15th October, Oulu, Finland
Projects
HiPO
Available from: 2010-10-21 Created: 2010-10-21 Last updated: 2015-08-31

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Eriksson, Björn

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