Conference article

Investigation and Energetic Analysis of a Novel Hydraulic Hybrid Architecture for On-Road Vehicles

Michael Michæl Sprengel
Dept. of Mechanical Engineering, Purdue University, West Lafayette, USA

Monika Ivantysynova
Dept. of Mechanical Engineering, Purdue University, West Lafayette, USA

Download articlehttp://dx.doi.org/10.3384/ecp1392a9

Published in: 13th Scandinavian International Conference on Fluid Power; June 3-5; 2013; Linköping; Sweden

Linköping Electronic Conference Proceedings 92:9, p. 87-98

Show more +

Published: 2013-09-09

ISBN: 978-91-7519-572-8

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

Abstract

Hydraulic hybrid transmissions in on-road vehicles have been proven to significantly reduce fuel consumption. Existing hydraulic hybrid transmissions have shown fuel savings of 30-50% with higher savings predicted when using advanced architectures. However while these results are promising there exists room for improvement. Consider the series hybrid architecture which is currently the most common full hydraulic hybrid configuration. This system requires over-center units which increase expense and are relatively uncommon especially for high performance bent axis units. Series hybrids may also possess a synthetic feel due to the high compliance inherent in their accumulators. Further efficiency suffers as the hydraulic units in series hybrids are often forced to operate at high pressures and low displacements. A novel hydraulic hybrid configuration is analyzed in this paper which may reduce costs; improve response; and increase efficiency under certain conditions. An automatic transmission; a series hydraulic hybrid; and the novel blended hybrid architecture were simulated for a class II truck and fuel consumption rates compared. Dynamic programming was used to optimally control all three transmissions thereby removing the effect of controller design of fuel consumption. Simulation results show a 44.8% increase in fuel efficiency for the series hybrid and a 37.0% increase with the proposed system architecture. While the proposed architectures currently lags the series hybrid in fuel economy; there exists sufficient benefits to merit further studies

Keywords

Hydraulic hybrids; blended hybrid; dynamic programming

References

[1] Johansson; A. and Ossyra; J.-C. 2010. Hydraulic Hybrid Transmission Design Considerations for Optimal Customer Satisfaction. Proceedings of the 7th International Fluid Power Conference. Aachen; Germany.

[2] Stecki; J. and Matheson; P. 2005. Advances in Automotive Hydraulic Hybrid Drives. Proceedings of the 6th JFPS International Symposium on Fluid Power. Tsukuba; Japan.

[3] Buchwald P.; Christensen H.; Larsen H.; Pedersen P.S. 1979. Improvement of City Bus Fuel Economy Using a Hydraulic Hybrid Propulsion System – A Theoretical and Experimental Study. SAE Paper 790305; Warrendale; PA USA.

[4] Sprengel; M. and Ivantysynova; M. Novel Transmission Configuration for Hydraulic Hybrid Vehicles. Proceedings of the International Sci-Tech Conference “Machine Dynamics and Vibro Acoustics”; Samara; Russia; pp. 207 - 209. 2012.

[5] Bellman R.E. 1957. Dynamic Programming. Princeton University Press; NJ; USA.

[6] Kotwicki; A.; 1982; "Dynamic Models for Torque Converter Equipped Vehicles;" SAE Technical Paper 820393

[7] Lin C.; Kang J.; Grizzle J.W. and Peng H. 2001. Energy Management Strategy for a parallel Hybrid Electric Truck. Proceedings of the 2001 American Control Conference; Arlington; VA USA.

[8] Bertsekas; D.P.; 1975. "Convergence of discretization procedures in dynamic programming;" Automatic Control; IEEE Transactions on ; vol.20; no.3

[9] Liu; J. and Peng; H. 2006. "Control optimization for a power-split hybrid vehicle;" American Control Conference.

[10] Cross; M. 2011. Optimal Control: An Effective Method for Designing Hydraulic Hybrid Vehicles. M.S. thesis. Purdue University; West Lafayette; IN; USA

[11] Wu; B.; Lin; C. C.; Filipi; Z.; Peng; H.; & Assanis; D. 2004. Optimal power management for a hydraulic hybrid delivery truck. Vehicle System Dynamics 42

Citations in Crossref