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Towards Resistance-free Hydraulics in Construction Machinery
Volvo Construction Equipment, Sweden.ORCID iD: 0000-0001-6452-2746
Innas BV, Netherlands.
Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
2012 (English)In: 8th International Fluid Power Conference, Dresden: Dresdner Verein zur Förderung der Fluidtechnik , 2012, Vol. 2, p. 123-138Conference paper, Published paper (Refereed)
Abstract [en]

The topic of resistance-free motion control refers to solutions that minimize or completely eliminate the need for proportional valves, hence avoiding the throttling losses associated with metering. Previous research by the authors shows how a secondary control system could be used to improve energy efficiency in construction machines. The proposed solution uses hydraulic transformers, powered by a common pressure rail system driving both the linear work implements and the rotary drives of a propulsion system in a wheel loader. An emphasis in this paper is on the sizing aspects of transformer-based system design. The solution under special observation enables the use of smaller transformers utilizing the differential cylinder as a two-stage gearbox by means of “short-circuiting” its two cylinder chambers. The results and outlook from this study touch on how state-of-the-art secondary control systems could improve the energy efficiency of future construction machinery and suggest potential areas of improvement.

Place, publisher, year, edition, pages
Dresden: Dresdner Verein zur Förderung der Fluidtechnik , 2012. Vol. 2, p. 123-138
National Category
Other Mechanical Engineering
Identifiers
URN: urn:nbn:se:liu:diva-132927OAI: oai:DiVA.org:liu-132927DiVA, id: diva2:1051345
Conference
8th International Fluid Power Conference, Dresden, March 26-28, 2012
Funder
Swedish Energy Agency, P32064-1Available from: 2016-12-01 Created: 2016-12-01 Last updated: 2017-10-26Bibliographically approved
In thesis
1. On Energy Efficient Mobile Hydraulic Systems: with Focus on Linear Actuation
Open this publication in new window or tab >>On Energy Efficient Mobile Hydraulic Systems: with Focus on Linear Actuation
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this dissertation, energy efficient hydraulic systems are studied. The research focuses on solutions for linear actuators in mobile applications, with emphasis on construction machines. Alongside the aspect of energy efficiency, the thesis deals with competing aspects in hydraulic system design found in the development of construction machines. Simulation models and controls for different concepts are developed, taking the whole machine into account. In line with this work, several proof of concept demonstrators are developed.

First, pump controlled systems are studied and a novel concept based on an open-circuit pump configuration is conceived. Special consideration is paid to multi-mode capabilities that allow for a broadened operating range and potential downsizing of components. Simulation models and controls are developed and the system is experimentally validated in a wheel loader application.

Second, the possibility for energy recuperation in valve controlled systems is investigated. In such solutions, a hydraulic motor, added to the meter-out port, is used for energy recovery during load lowering and in multi-function operation. Recuperated energy is either be used momentarily or is stored in a hydraulic accumulator. The proposed solution means an incremental improvement to conventional systems, which is sometimes attractive to machine manufacturers due to fewer uncertainties in reliability, safety and development cost. The energy recovery system is studied on a conceptual level where several alternative systems are proposed and a concept based on a two-machine hydraulic pressure transformer is selected for a deeper control study followed by experimental validation.

Third, so-called `common pressure rail' systems are suggested. This technique is well established for rotary drives, at least for the industrial sector. However, in applying this technique to mobile hydraulics, feasible solutions for linear actuators are needed. In this dissertation, two approaches to this problem are presented. The first one is the hydraulic pressure transformer, studied in simulation as the key-component of a `series hybrid' topology for wheel loaders. In the second approach variable displacement linear actuators (VDLA) based on a 4-chamber cylinder and multi-mode control is applied. In a theoretical study a model predictive control approach is suggested and new insights to the trade-off between controllability and energy efficiency of a multi-chamber cylinder are presented. Finally, a fullscale hydraulic hybrid system based on secondary controlled hydraulic motors and VDLAs is designed and experimentally validated on a large excavator.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2017. p. 82
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1857
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:liu:diva-142326 (URN)10.3384/diss.diva-142326 (DOI)9789176855119 (ISBN)
Public defence
2017-11-17, C3, C-huset, Campus Valla, Linköping, 10:15 (English)
Opponent
Supervisors
Funder
Swedish Energy AgencyVINNOVA
Available from: 2017-10-26 Created: 2017-10-26 Last updated: 2017-11-09Bibliographically approved

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