liu.seSök publikationer i DiVA
Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Energy Efficient Load Adapting System Without Load Sensing: Design and Evaluation
Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan. (FluMeS)
Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan. (FluMeS)ORCID-id: 0000-0002-6371-1390
Linköpings universitet, Institutionen för ekonomisk och industriell utveckling, Fluid och mekanisk systemteknik. Linköpings universitet, Tekniska högskolan. (FluMeS)
2009 (Engelska)Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Ort, förlag, år, upplaga, sidor
Linköping, 2009.
Nyckelord [en]
fluid power, mobile systems, LS systems, pre compensation, energy efficiency, flow sharing
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
URN: urn:nbn:se:liu:diva-52691OAI: oai:DiVA.org:liu-52691DiVA, id: diva2:284716
Konferens
11th Scandinavian International Conference on Fluid Power, SICFP'09, June 2-4, Linköping, Sweden
Tillgänglig från: 2010-01-08 Skapad: 2010-01-08 Senast uppdaterad: 2015-08-31Bibliografiskt granskad
Ingår i avhandling
1. Fluid Power Systems for Mobile Applications: with a Focus on Energy Efficiency and Dynamic Characteristics
Öppna denna publikation i ny flik eller fönster >>Fluid Power Systems for Mobile Applications: with a Focus on Energy Efficiency and Dynamic Characteristics
2013 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Linköping: Linköping University Electronic Press, 2013. s. 59
Serie
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1595
Nationell ämneskategori
Maskinteknik
Identifikatorer
urn:nbn:se:liu:diva-92578 (URN)LIU-TEK-LIC-2013:29 (Lokalt ID)978-91-7519-600-8 (ISBN)LIU-TEK-LIC-2013:29 (Arkivnummer)LIU-TEK-LIC-2013:29 (OAI)
Presentation
2013-05-17, ACAS, A-huset, Campus Valla, Linköpings universitet, Linköping, 10:15 (Svenska)
Opponent
Handledare
Tillgänglig från: 2013-05-22 Skapad: 2013-05-13 Senast uppdaterad: 2019-12-08Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Personposter BETA

Axin, MikaelEriksson, BjörnPalmberg, Jan-Ove

Sök vidare i DiVA

Av författaren/redaktören
Axin, MikaelEriksson, BjörnPalmberg, Jan-Ove
Av organisationen
Fluid och mekanisk systemteknikTekniska högskolan
Teknik och teknologier

Sök vidare utanför DiVA

GoogleGoogle Scholar

urn-nbn

Altmetricpoäng

urn-nbn
Totalt: 2870 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf