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Mode Switching and Energy Recuperation in Open-Circuit Pump Control
Linköpings universitet, Institutionen för ekonomisk och industriell utveckling. Linköpings universitet, Tekniska högskolan. (Fluid och mekanisk systemteknik)
Linköpings universitet, Institutionen för ekonomisk och industriell utveckling. Linköpings universitet, Tekniska högskolan.
2007 (Engelska)Ingår i: The 10th Scandinavian International Conference on Fluid Power, Tampere, Finland, Tampere, Finland: Tampere University of Technology , 2007, s. 197-209Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

Today´s mobile machines most often contain hydraulic valve controlled drives in an open loop circuit. For the purpose of saving energy, the constant pressure pumps have in the past frequently been replaced by load-sensing pumps and load-sensing valves. However, considering applications where the load is helped by the gravitational force, even these hydraulic systems often suffer from poor efficiency. In this article, a novel pump-controlled hydraulic system is studied where energy recuperation from lowering motions is posssible. The pumps are fully displaceable in both directions, working as motors when lowering loads. The amount of recuperated energy is highly dependent of the chosen control strategy, the hydromechanical properties as well as the target application. Furthermore, the article describes how valve design becomes an important feature in an attempt to reach high efficiency and machine operability.

Ort, förlag, år, upplaga, sidor
Tampere, Finland: Tampere University of Technology , 2007. s. 197-209
Nyckelord [en]
Pump control open circuit energy efficiency energy recuperation
Nationell ämneskategori
Strömningsmekanik och akustik
Identifikatorer
URN: urn:nbn:se:liu:diva-16075OAI: oai:DiVA.org:liu-16075DiVA, id: diva2:133010
Tillgänglig från: 2009-01-07 Skapad: 2009-01-07 Senast uppdaterad: 2009-04-30Bibliografiskt granskad
Ingår i avhandling
1. Saving Energy in Construction Machinery using Displacement Control Hydraulics: Concept Realization and Validation
Öppna denna publikation i ny flik eller fönster >>Saving Energy in Construction Machinery using Displacement Control Hydraulics: Concept Realization and Validation
2008 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

In the sector of mobile hydraulics, valve controlled systems are predominant. In these systems the load force and speed are adjusted by control valves. In machines where multiple drives are used in parallel at extremely varying loads the energy efficiency of such systems is often compromised over large working regions. Most valve controlled systems also lack the possibility to recuperate potential energy.

A different category of hydraulic systems, called displacement controlled hydraulics are based on the manipulation of the hydraulic flow using the relative displacement of the hydraulic machines as the final control element. This type of hydrostatic power transfer, yields a resistance free velocity control, ideally leading to lossless load actuation.

This thesis concerns the introduction of a new type of displacement controlled hydraulic system, adapted for construction machinery. The system decouples the hydraulic functions using one dedicated hydraulic machine for each drive. These machines are of open circuit type, capable of over center operation which enables energy recuperation. The system also comprises four separate valves that by means of switching allow the cylinder to be controlled over all four load quadrants. Depending on the selected valve hardware, the system may also include features available in a conventional valve controlled system, such as meter-out flow control. The system supports both symmetrical and asymmetrical cylinders. However, using the asymmetrical type the load may be controlled in two distinct states of operation. This yields an increased region of operation, which is otherwise generally stated as a drawback in displacement controlled systems. It also allows the selection between different control modes, where one of the modes is always more efficient than another.

In this research both theoretical studies and a practical implementation demonstrate the energy related benefits of the new concept. The target application of this study is a medium-size wheel loader. Measurement results using the wheel loader in a short truck loading cycle show a 10% percent reduction in fuel consumption. According to the theoretical investigation, this corresponds to a 20% reduction in energy consumption for the hydraulicsystem itself.

Ort, förlag, år, upplaga, sidor
Linköping: Linköping University Electronic Press, 2008. s. 117
Serie
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1372
Nationell ämneskategori
Strömningsmekanik och akustik
Identifikatorer
urn:nbn:se:liu:diva-15588 (URN)LIU-TEK-LIC-2008:30 (Lokalt ID)978-91-7393-860-0 (ISBN)LIU-TEK-LIC-2008:30 (Arkivnummer)LIU-TEK-LIC-2008:30 (OAI)
Presentation
A35, A-huset, Campus Valla, Linköpings universitet, Linköping, Sweden (Engelska)
Opponent
Handledare
Tillgänglig från: 2009-01-07 Skapad: 2008-11-19 Senast uppdaterad: 2020-03-29Bibliografiskt granskad

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