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Modular Design of Hydromechanical Transmissions for Mobile Working Machines
Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
2013 (English)In: Proceedings of the 13th Scandinavian International Conference on Fluid Power,(SICFP2013), June 3-5, 2013, Linköping, Sweden, Linköping: Linköping University Electronic Press, 2013, 113-119 p.Conference paper, Oral presentation only (Refereed)
Abstract [en]

This paper demonstrates an optimisation-based method to design modular gearboxes scalable for a range of applications. The design is adapted to the typical operating behaviours of the reference vehicles and considers the manufacturing costs of the gearboxes. Hydromechanical continuously variable transmissions (CVTs) are today strong candidates to replace drive line transmissions based on fuel-thirsty torque converters in many mobile working machines. The advantages include wide range of torque/speed ratios, high energy efficiency throughout the speed range and decoupling of the engine speed and the vehicle speed. Advanced multiple mode CVTs, however, are difficult to evaluate early in the product development process due to the complex architectures and the great variety of possible concepts. There is consequently an increased need for methods to design, compare and evaluate the transmission concepts. To decrease the development and manufacturing costs, there is also a need for scalable transmission concepts that can be used in several applications of different classes. The results show the proficiency of the methodology compared to a manual design process and that the energy efficiency of the transmissions are heavy coupled to the designs.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2013. 113-119 p.
Series
Linköping Electronic Conference Proceedings, ISSN 1650-3686 (print), 1650-3740 (online) ; 92
Keyword [en]
Hydromechanical transmissions, Power-split, Design optimisation
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-99381DOI: 10.3384/ecp1392a12ISBN: 978-91-7519-572-8 (print)OAI: oai:DiVA.org:liu-99381DiVA: diva2:656785
Conference
Proceedings of the 13th Scandinavian International Conference on Fluid Power, (SICFP2013), June 3-5, 2013, Linköping, Sweden
Available from: 2013-10-17 Created: 2013-10-17 Last updated: 2017-11-09Bibliographically approved
In thesis
1. Design Automation of Complex Hydromechanical Transmissions
Open this publication in new window or tab >>Design Automation of Complex Hydromechanical Transmissions
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis proposes an automated methodology for the design of complex multiple-mode hydromechanical transmissions. High fuel prices and strict emission regulations are today drivers of the development of new fuel-efficient drive transmissions for construction machinery. Hydromechanical transmissions have high energy efficiency and a wide torque/speed conversion range. They are today strong candidates to replace the fuel-thirsty torque converters conventionally used in heavy construction machines. The trend towards more complex transmission architectures increases the need for more sophisticated product development methods. Complex multiple-mode transmissions are difficult to design and prototype and can be realised in a great number of different architectures. This increases the need for reliable concept evaluation in early design stages. The design of the transmission is also strongly coupled to its energy consumption and for a fair comparison  between transmission concepts optimal designs are necessary.

Design automation and optimisation with detailed simulation models can support the industrial engineer in the design task and increase the available knowledge early in the design process. The proposed methodology uses simulation-based optimisation to design the transmission for a specific vehicle application. Various aspects of the transmission’s characteristics may be targeted, although energy efficiency is in great focus in this work. To evaluate the energy efficiency, the transmission designs are simulated using backward-facing simulations with detailed power loss models. The methodology is applicable for designing the drive transmissions of construction machines and other mobile working vehicles such as agricultural machines, forest machines and mobile mining equipment.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2013. 70 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1620
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-99382 (URN)10.3384/lic.diva-99382 (DOI)LIU-TEK-LIC-2013:54 (Local ID)978-91-7519-504-9 (ISBN)LIU-TEK-LIC-2013:54 (Archive number)LIU-TEK-LIC-2013:54 (OAI)
Presentation
2013-10-25, ACAS, A-huset, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2013-10-17 Created: 2013-10-17 Last updated: 2013-10-21Bibliographically approved
2. Conceptual Design of Complex Hydromechanical Transmissions
Open this publication in new window or tab >>Conceptual Design of Complex Hydromechanical Transmissions
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis explores the conceptual design process of complex hydromechanical transmissions for mobile working machines. Efficient methods for design optimisation and controller development are presented to support the final concept selection.

In the endeavour to develop new fuel-efficient driveline solutions for construction machines and off-road equipment new complex hydromechanical transmission concepts are being investigated. This pursuit is driven by stricter emission legislation, high fuel prices and a desire for a greener image both for customers and manufacturers. The trend towards more complex transmission architectures increases the need for more sophisticated product development methods. Complex multiple-mode transmissions are difficult to design and prototype and can be realised in a great number of architectures. By introducing a secondary energy storage in the machine the design space expands further for both hardware and software. There is accordingly a need for more reliable concept assessment in early design stages and the possibility to support concurrent engineering throughout the development process.

Previous research on the design and development of hydromechanical transmissions has been limited to analysis of fixed concept designs or design optimization using very simple performance indicators. Existing methodologies for electrified on-road vehicles are not suitable for off-road working machines with hydromechanical transmissions and hydraulic energy storage.

The proposed conceptual design process uses detailed quasi-static simulation models and targets to optimise the fuel efficiency of the specific machine specifications and operations. It is also shown how high-speed dynamic simulations can be used for controller development and hardware-in-the-loop simulations to support an efficient product design process. The methods are demonstrated for typical use cases targeting new transmission development for construction machines. Software control development is also treated using control optimisation and real-time simulation. Finally a novel hybrid hydromechanical motion system is presented for which an efficient design process is crucial to its end performance.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2017. 70 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1883
National Category
Embedded Systems
Identifiers
urn:nbn:se:liu:diva-142895 (URN)10.3384/diss.diva-142895 (DOI)9789176854471 (ISBN)
Public defence
2017-12-08, ACAS, Hus A, Campus Valla, Linköping, 10:15 (English)
Opponent
Supervisors
Note

In the printed verison the series name Linköping studies in Arts and Science is incorrect. The correct series name is Linköping studies in science and technology. Dissertations.

Available from: 2017-11-09 Created: 2017-11-09 Last updated: 2017-11-30Bibliographically approved

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Pettersson, KarlKrus, Petter

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