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Simulation Aided Design and Testing of Hydromechanical Transmissions
Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering. Volvo Construction Equipment.
Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-2315-0680
2014 (English)In: The 9th JFPS International Symposium on Fluid Power, Matsue, 2014, 2014Conference paper, Published paper (Refereed)
Abstract [en]

This paper demonstrates the use of high-speed simulation in transmission conceptual design and presents a transmission test bed for hardware-in-the-loop simulations of hydromechanical transmission concepts. Complex transmissions, such as multiple-mode hydromechanical transmissions and hydraulic hybrid transmissions, present new difficulties and costs in the development process. There is today a greater demand for more efficient product development and more work has shifted towards simulation. The Hopsan simulation package allows robust, high-speed simulations suitable for both offline and hardware-in-the-loop simulation. New simulation models for hydromechanical transmissions are developed and used to simulate a known two-mode transmission concept. The same concept is also tested in hardware-in-the-loop simulations in the proposed transmission test bed. Results show good agreement with the hardware tests and highlight the proficiency of the simulation tools.

Place, publisher, year, edition, pages
2014.
Keyword [en]
Hydromechanical Transmission, Hardware-in-the-loop, Hopsan
National Category
Aerospace Engineering
Identifiers
URN: urn:nbn:se:liu:diva-126561ISBN: 4-931070-10-8 (print)OAI: oai:DiVA.org:liu-126561DiVA: diva2:915482
Conference
the 9th JFPS International Symposium on Fluid Power in Matsue, Shimane Japan, on October 28-31, 2014
Available from: 2016-03-30 Created: 2016-03-30 Last updated: 2017-08-17
In thesis
1. Control Aspects of Complex Hydromechanical Transmissions: with a Focus on Displacement Control
Open this publication in new window or tab >>Control Aspects of Complex Hydromechanical Transmissions: with a Focus on Displacement Control
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis deals with control aspects of complex hydromechanical transmissions. The overall purpose is to increase the knowledge of important aspects to consider during the development of hydromechanical transmissions to ensure transmission functionality. These include ways of evaluating control strategies in early design stages as well as dynamic properties and control aspects of displacement controllers, which are key components in these systems.

Fuel prices and environmental concerns are factors that drive research on propulsion in heavy construction machinery. Hydromechanical transmissions are strong competitors to conventional torque-converter transmissions used in this application today. They offer high efficiency and wide speed/torque conversion ranges, and may easily be converted to hybrids that allow further fuel savings through energy recuperation. One challenge with hydromechanical transmissions is that they offer many different configurations, which in turn makes it important to enable evaluation of control aspects in early design stages. In this thesis, hardware-in-the-loop simulations, which blend hardware tests and standard software-based simulations, are considered to be a suitable method. A multiple-mode transmission applied to a mid-sized construction machine is modelled and evaluated in offline simulations as well as in hardware-in-the-loopsimulations.

Hydromechanical transmissions rely on efficient variable pumps/motors with fast, accurate displacement controllers. This thesis studies the dynamic behaviour of the displacement controller in swash-plate axial-piston pumps/motors. A novel control approach in which the displacement is measured with an external sensor is proposed. Performance and limitations of the approach are tested in simulations and in experiments. The experiments showed a significantly improved performance with a controller that is slightly more advanced than a standard proportional controller. The implementation of the controller allows simple tuning and good predictability of the displacement response.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2017. 55 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1781
National Category
Control Engineering Other Electrical Engineering, Electronic Engineering, Information Engineering Robotics Computer Engineering Vehicle Engineering
Identifiers
urn:nbn:se:liu:diva-139855 (URN)10.3384/lic.diva-139855 (DOI)978-91-7685-483-9 (ISBN)
Presentation
2017-09-08, ACAS, Campus Valla, Linköping, 10:15 (Swedish)
Opponent
Supervisors
Available from: 2017-08-17 Created: 2017-08-17 Last updated: 2017-08-28Bibliographically approved

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