L. Viktor Larsson
Department of Management and Engineering Fluid and Mechatronic Systems, Linköping University, Sweden
Petter Krus
Department of Management and Engineering Fluid and Mechatronic Systems, Linköping University, Sweden
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http://dx.doi.org/10.3384/ecp1815669Ingår i: WIEFP2018 – 4th Workshop on Innovative Engineering for Fluid Power, November 28-30, Sao Paulo, Brazil
Linköping Electronic Conference Proceedings 156:14, s. 69-73
Publicerad: 2018-12-10
ISBN: 978-91-7685-136-4
ISSN: 1650-3686 (tryckt), 1650-3740 (online)
Fuel efficiency and environmental concerns are factors that drive the development of complex solutions for propulsion in heavy working machines. Although these solutions, such as power-split hydromechanical transmissions and hydraulic hybrids, indeed are promising in terms of energy efficiency, they also tend to increase the dependency on accurate, stable control. The realization of this aspect, in turn, relies on continuous testing throughout the development process, usually carried out on expensive, time-consuming prototypes. To lower the development costs and time, hardware-in-the-loop (HWIL) simulations may be introduced as a middle-way between pure prototyping and computer-based simulations. In this concept, some parts of the transmission are represented as hardware while others are included as mathematical models running in real-time in a data acquisition system. This mix of hardware and software allows for high versatility while maintaining a high level of reliability of the results. This paper reports on parts of a study on HWIL simulations of heavy complex hybrid hydromechanical transmissions. Control algorithms for the hardware/model interface in a test rig are derived and their performance are evaluated in HWIL simulations of a mid-sized wheel loader. The results show the importance of fast rig controllers to capture the fast dynamics of the software simulations. It was also found that an important aspect of HWIL simulations is that they are well aligned with their purpose. If so, the simulation yields more reliable knowledge, which is of higher use in the design process of these complex systems. To summarize, HWIL simulations may, if implemented properly, be an important asset in the development of heavy complex hybrid hydromechanical transmissions.
Hardware-in-the-loop-simulations, hydromechanical transmissions, heavy hydraulic hybrid vehicles
[1] Carl, B., Ivantysynova, M., Williams, K. “Comparison of Operational Characteristics in Power Split Continuously Variable Transmissions,” In: SAE Technical Paper. SAE International, 2006.
[2] Anderl, T., Winkelhake, J., Scherer, M. “Power-split Transmissions for Construction Machinery,” In: 8th International Fluid Power Conference (IFK2012). Dresden, Germany, 2012.
[3] Cheong, K. L., Li, P. Y, Sedler, S., Chase, T. R. “Comparison between Input Coupled and Output Coupled Power-Split Configurations in Hybrid Vehicles,” In: Proceedings of the 52nd National Conference on Fluid Power. Milwaukee, WI, USA, 2011.
[4] Boretti, J., Stecki, J. “Hydraulic Hybrid Heavy Duty Vehicles – Challenges and Opportunities”. In: SAE Technical Paper 2012-01-2036, 2012.
[5] Jansson, A., Lennevi, J., Palmberg, J-O. “Modelling, simulation and control of a load simulator for hydrostatic transmissions,” In: 3rd Scandinavian International Conference on Fluid Power. Linköping, Sweden, 1993.
[6] Fathy, H. K., Filipi, Z. S., Hagena, J., Stein, J. L. “Review of Hardware-in-the-Loop and Its Prospects in the Automotive Area”. In: Modeling and Simulation for Military Applications. Vol 6228. Orlando, FL, USA, 2006.
[7] Sprengel, M., Ivantysynova, M. “Hardware-In-the-Loop Testing of a Novel Blended Hydraulic Hybrid Transmission”. In: 8th FPNI PhD Symposium on Fluid Power. Lappeenranta, Finland, 2014.
[8] Linköping University, Division of Fluid and Mechatronic Systems. Hopsan. 2018. Url: https://liu.se/en/research/hopsan (visited on 2018-10-01).
[9] Larsson, L. V., Krus, P. “A General Approach to Low-Level Control of Heavy Complex Hybrid Hydromechanical Transmissions”. In: Proceedings of the ASME/BATH 2018 Symposium on Fluid Power and Motion Control. Bath, UK, 2018.
[10] Larsson, L. V., Krus, P. “Displacement Control Strategies of an In-Line Axial-Piston Unit”. In: The 15th Scandinavian International Conference on Fluid Power (SICFP’17). Linköping, Sweden, 2017.
