Abstract
Hydrostatic transmission (HST) system used in heavy earth moving machineries (HEMMs) has high power density, wide range of speed control and good overall efficiency. Hydrostatically coupled two motor summation drive is an alternative power transmission system, compared to existing closed-loop HST system with low speed high torque motor, used in HEMM. Such drive arrangement has made the possibility to design the transmission system, used in heavy vehicles, in an efficient way to cover wide range of torque-speed demand. This article studies the concept of two motor summation drive and its steady state performance. Experiments have been carried out to analyze the performance of such system. The characteristics of single and two motor drive systems are compared at different load-torque and speed levels. It is concluded that two motor hydrostatic drive systems is more effective at high load-torque and low speed compared to single motor drive system.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
Abbreviations
- \( D_{p} \) :
-
Displacement of the main pump
- \( D_{m} \) :
-
General displacement of the hydro-motor
- \( D_{m1} \) :
-
Displacement of the hydro-motor-1
- \( D_{m2} \) :
-
Displacement of the hydro-motor-2
- \( \Updelta P_{p} \) :
-
Differential pressure across the main pump
- \( Q_{p} \) :
-
Flow supplied by the main pump
- \( T_{l} \) :
-
Generalized load-torque
- \( T_{{l_{d} }} \) :
-
Load-torque on double motor
- \( T_{{l_{s} }} \) :
-
Load-torque on single motor
- \( \alpha_{m1} \) :
-
Displacement setting of the hydro-motor-1
- \( \alpha_{m2} \) :
-
Displacement setting of the hydro-motor-2
- \( \alpha_{p} \) :
-
Displacement setting of the main pump
- \( \eta_{d} \) :
-
Efficiency of the two motor drive system
- \( \eta_{s} \) :
-
Efficiency of the single motor drive system
- \( \omega \) :
-
Generalized speed of HST drive
- \( \omega_{m1} \) :
-
Speed of the hydro-motor-1
- \( \omega_{m2} \) :
-
Speed of the hydro-motor-2
- \( \omega_{p} \) :
-
Speed of the main pump
References
T. Ze-yang, Hydraulic motors and vehicle hydrostatic transmission system of wheel motor type. Patent No. 4903792, 1990
S. Eckhard, G. Gerhard, Mobile hydraulics—an overview, in Proceedings of the 5th International Fluid Power Conference, 20–22 March, 2006, Aachen, Germany, vol. 3, pp. 13–24
J.C. Ossyra, Control Concepts for Vehicle Drive Line to Reduce Fuel Consumption, VDI Fortschritt-Berichte. Reihe 12 Nr. 598, (VDI, Dusseldorf, 2005), ISBN: 3-18-359812-4
K. Torsten, J. Hilman, D. Henning, Comparison of selected fluid technical drive line concepts for off-highway machines, in 5th International Fluid Power Conference, Aachen, Germany, 2006, vol. 3, pp. 45–56
B. Carl, K. Williams, M. Ivantysynova, Comparison of operational characteristics in power split continuously variable transmissions, in SAE 2006, Commercial vehicle Congress Exhibition, Oct. 2006, Chicago, IL, USA, SAE 2006-01-3468
H.O. Triet Hung, A.H.N. Kyoung Kwan, Modelling and simulation of hydrostatic transmission system with energy regeneration using hydraulic accumulator. J. Mech. Sci. Technol. 24(5), 1163 (2012)
M. Sannelius, Hydrostatic Transmissions with Sequence-controlled Motors—Open Control of Zero-motor Connection, Technical report LITH-IKP-R-987 (Dept. of Mech. Eng., Linkoping University, Linkoping, Sweden, 1997)
M. Sannelius, K.O. Palmberg, Control aspects of hydrostatic transmissions with sequence-controlled motors, in Proceedings, 4th Scandinavian International Conference on Fluid power, tempere, Finland 1995
M. Sannelius, K.O. Palmberg, Hardware in the loop simulation of a hydrostatic transmission with sequence-controlled motors, in Proceedings, 3rd JHPS International Symposium on Fluid Power, Yokohama, Japan, 1996
M. Sannelius, K.E. Rydberg, Hydrostatic transmissions for wheel loaders-control aspects of a multi-motor concept, in International Fluid technisches Kolloquium, Aachen, Germany, 1996, pp. 389–403
BS-4617, Methods of Testing Hydraulic Pumps and Motors for Hydrostatic Power Transmission, 1983, British Standard Institution, London
Acknowledgments
The Research and Development Project Grant for 2009–2012 from University Grant Commission, Government of India, for carrying out the research work on this topic is acknowledged. The authors are thankful to the representative of Bosch Rexroth India, Ltd. for their help in fabricating the Test set up.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Dasgupta, K., Kumar, N. & Kumar, R. Steady State Performance Analysis of Hydrostatic Transmission System using Two Motor Summation Drive. J. Inst. Eng. India Ser. C 94, 357–363 (2013). https://doi.org/10.1007/s40032-013-0084-y
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s40032-013-0084-y