Rohit Hippalgaonkar
School of Mechanical Engineering, Purdue University, West Lafayette, IN, USA
Monik Ivantysynova
Department of Agricultural & Biological Engineering, Purdue University, West Lafayette, IN, USA
Download article
http://dx.doi.org/10.3384/ecp1392a4Published in: 13th Scandinavian International Conference on Fluid Power; June 3-5; 2013; Linköping; Sweden
Linköping Electronic Conference Proceedings 92:4, p. 31-42
Published: 2013-09-09
ISBN: 978-91-7519-572-8
ISSN: 1650-3686 (print), 1650-3740 (online)
A displacement-controlled (DC) prototype mini-excavator built at the Maha Fluid Power Research Center at Purdue University; had previously demonstrated 40% fuel savings over a standard mini-excavator with load-sensing architecture; in independent side-by-side testing. A DC series-parallel (DC S-P) hydraulic hybrid architecture has since been conceptualized where the braking energy of the swing can be stored in an accumulator. This architecture promises further efficiency gains over the DC architecture by taking advantage of four--quadrant operation enabled by DC actuation; swing kinetic energy storage capability; and enables 50% reduced engine power; through load-leveling and power management; while exploiting the cyclical nature of excavator work cycles. In simulation; feasibility studies for the DC S-P hybrid excavator with reduced engine power; showed 51% fuel savings over the standard excavator without loss of performance for an expert truck-loading cycle. Conservative power management was used for these studies; with the downsized engine operated efficiently at a single point (maximum governed speed and torque). This work will focus on: a) the high-fidelity co-simulation model used to model dynamic behavior and evaluate various power management strategies; b) working hydraulic schematics for the series-hybrid swing drive; c) the controller in use on the prototype; and d) measurements for proof-of-concept
DC actuation; hydraulic hybrid; multi-actuator machines; engine management and downsizing; secondary-controlled swing motor
[1] Rahmfeld; R. and Ivantysynova; M. 2001. Displacement Controlled Linear Actuator with Differential Cylinder - A Way to Save Primary Energy in Mobile Machines. Proc. of 5th International Conference on Fluid Power Transmission and Control (ICFP’2001); Hangzhou; China; pp. 316 - 322.
[2] Zimmerman; J.; Pelosi; M.; Williamson; C.; and Ivantysynova; M. 2007. Energy Consumption of an LS Excavator Hydraulic System.2007 ASME International Mechanical Engineering Congress and Exposition; Seattle; WA; USA. IMECE2007-42267.
[3] Williamson; C.; Zimmerman; J. and Ivantysynova; M. 2008. Efficiency Study of an Excavator Hydraulic System Based on Displacement-Controlled Actuators. Bath ASME Symposium on Fluid Power and Motion Control (FPMC2008); pp.291-307
[4] Williamson; Christopher A. Ph.D. Thesis; Purdue University. December 2010. Power Management for Multi-Actuator Mobile Machines with Displacement Controlled Hydraulic Actuators.
[5] Zimmerman; J.; Busquets; E. and Ivantysynova; M. 2011. 40% Fuel Savings by Displacement Control Leads to Lower Working Temperatures - A Simulation Study and Measurements. Proceedings of the 52nd National Conference on Fluid Power 2011; NCFP I11-27.2.
[6] Zimmerman; J. and Ivantysynova; M. 2011. Hybrid Displacement Controlled Multi-Actuator Hydraulic Systems. Proceedings of the 12th Scandinavian International Conference on Fluid Power; May 18-20 2011; Tampere; Finland; pp 217 - 233.
[7] Zimmerman; J.; Hippalgaonkar; R. and Ivantysynova; M. 2011. Optimal Control for the Series-Parallel Displacement Controlled Hybrid Excavator.ASME/Bath Symposium on Fluid Power and Motion Control; Arlington; VI; USA.
[8] Hippalgaonkar; R.; Zimmerman; J. and Ivantysynova; M. 2011. Investigation of Power Management Strategies for a Multi-Actuator Hydraulic Hybrid Machine System. SAE 2011 Commercial Vehicle Engineering Congress; Rosemont; IL; USA.
[9] Hippalgaonkar; R.; Ivantysynova; M. and Zimmerman; J. 2012. Fuel-Savings of a Mini-Excavator through a Hydraulic Hybrid Displacement Controlled System. 8th International Fluid Power Conference (IFK) Dresden. Dresden; Germany.
[10] Zimmerman; Joshua D. Ph.D.; Purdue University; May 2012. Toward Optimal Multi-Actuator Displacement Controlled Mobile Hydraulic Systems.
