Conference article

Shuzhong Zhang
Department of Mechanical Engineering, Aalto University, Espoo, Finland / School of Mechanical Engineering and Automotive, Fujian University of Technology, Fuzhou, China

Tatiana Minav
Department of Mechanical Engineering, Aalto University, Espoo, Finland

Matti Pietola
Department of Mechanical Engineering, Aalto University, Espoo, Finland

Download articlehttp://dx.doi.org/10.3384/ecp17144187

Published in: Proceedings of 15:th Scandinavian International Conference on Fluid Power, June 7-9, 2017, Linköping, Sweden

Linköping Electronic Conference Proceedings 144:18, p. 187-195

Published: 2017-12-20

ISBN: 978-91-7685-369-6

ISSN: 1650-3686 (print), 1650-3740 (online)

Environmental restrictions and economic opportunities create demand to investigate the potential of further hybridization of non-road mobile machinery (NRMM). Many proposals for energy saving in hydraulic systems have been researched. In addition to well-established methods, there are zonal or decentralized hydraulics – an approach first introduced in the aircraft industry. In a fully decentralized system, the hydraulic pumps are disconnected from the engine and replaced with hydraulic power packs distributed throughout the system. In this study, decentralized hydraulics are realized with a direct driven hydraulics drive (DDH). By applying DDH, further hybridization can be achieved which will lead to increased productivity, minimized energy consumption, and robust performance in mobile machines operating in various environments. Therefore, the aim of this paper is to investigate the energy efficiency of the excavator hydraulic system equipped with DDH under typical digging cycles. For this purpose, a model which coupled multi-body dynamics, hydraulic system, and an electric motor is developed in the Matlab Simulink environment. Simulation results are validated by a simplified representation of micro excavator (one example of DDH) as a proof of concept.

[1] Tier 4 emission standards for nonroad diesel engines, online, https://www.dieselnet.com/standards/us/nonroad.php#tier4.

[2] M Kagoshima, M Komiyama, T Nanjo, and A Tsutsui. Development of new hybrid excavator. Kobelco Technology Review, (27): 39-42, 2007.

[3] J D Zimmerman, M Pelosi, C A Williamson, and M Ivantysynova. Energy consumption of an LS excavator hydraulic system. ASME 2007 International Mechanical Engineering Congress and Exposition, 117-126,2007.

[4] T Lin, Q Wang, B Hu, and W Gong. Development of hybrid powered hydraulic construction machinery. Automation in Construction, 19(1): 11-19, 2010.

[5] 12H GTE hybrid harvester, http://www.logset.com/12H_GTE_Hybrid

[6] Anon. Komatsu introduces the world’s first hydraulic excavator: hybrid evolution plan for construction equipment. Komatsu press release, 05: 2008, http://www.komatsu.com/CompanyInfo/press/2008051315113604588.html

[7] New Generation Hybrid Excavator ZH200-5B, online, http://www.hitachi.com/environment/showcase/solution/industrial/hybrid_excavator.html

[8] M. Edamura, E. S. Ishida, S. Imura, and S. Izumi. Adoption of electrification and hybrid drive for more energy-efficient construction machinery. Hitachi Review, 62(2): 118, 2013.

[9] R Hippalgaonkar, and M Ivantysynova. A series-parallel hydraulic hybrid mini-excavator with displacement controlled actuators. The 13th Scandinavian International Conference on Fluid Power, SICFP2013, June 3-5, 2013, Linköping, Sweden

[10] W Shen, J Jiang, X Su, and H Karimi. Energy saving analysis of hydraulic hybrid excavator based on common pressure rail, Hindawi, https://www.hindawi.com/journals/tswj/2013/560694/

[11] T Minav, T Lehmuspelto, P Sainio, and M Pietola. Series hybrid mining loader with zonal hydraulics. 8-10 March 2016, IFK-2016, Dresden, Germany [12]T Hassi, A Korva, S Markkula, etc. Improving energy efficiency of an electric mini excavator. 11th International DAAAM Baltic Conference "Industrial engineering", 20-22 April 2016, Tallinn, Estonia

[13] J D Zimmerman. Towards optimal multi-actuator displacement controller mobile hydraulic systems, 2012, Purdue University: Indiana, USA.

[14] T Minav, and M Pietola. Position control of direct-driven hydraulic drive without conventional oil tank for more electric aircraft, MEA2015 More Electric Aicraft, 2015, Toulouse, France.

[15] A Järf. Flow compensation using hydraulic accumulator in direct driven hydraulic differential cylinder application and effects on energy effciency. 2016, Aalto University: Espoo, Finland.

[16] A Järf, T Minav, and M Pietola. Nonsymmetrical flow compensation using hydraulic accumulator in direct driven differential cylinder, Proceedings of the ASME 2016 9th FPNI Ph.D. Symposium on Fluid Power, FPNI2016, October 26-28, 2016, Florianópolis, SC, Brazil

[17] C Canudas de Wit, H Olsson, K J Astrom, and P Lischinsky. A new model for control of systems with friction. IEEE Transactions on automatic control 40(3): 419-425, 1995.

[18] Ned Mohan. Advanced electric drives: analysis, control, and modeling using MATLAB/Simulink. John wiley & sons, 2014.

[19] Emerson Industrial Automation. Technical Data Unimotor FM and HD High performance AC brushless servo motors, 2013. http://www.emersonindustrial.com/enen/documentcenter/ControlTechniques/Brochures/unimotor_technical_data.pdf.