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Hardware Implementation Details and Test Results for a High-Bandwith, Hydrostatic Transient Engine Dynamometer System
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Abstract
Transient operation of automobile engines is known to contribute significantly to regulated exhaust emissions, and is also an area of drivability concerns. Furthermore, many on-board diagnostic algorithms do not perform well during transient operation and are often temporarily disabled to avoid problems. The inability to quickly and repeatedly test engines during transient conditions in a laboratory setting limits researchers and development engineers ability to produce more effective and robust algorithms to lower vehicle emissions.
To meet this need, members of the Powertrain Control Research Laboratory (PCRL) at the University of Wisconsin-Madison have developed a high-bandwidth, hydrostatic dynamometer system that will enable researchers to explore transient characteristics of engines and powertrains in the laboratory. Unlike most conventional dynamometers that typically operate under relatively steady state operation, this device is capable of providing a repeatable virtual transient engine load on engines under test during motoring as well as absorbing conditions.
In this paper the authors review the hardware design considerations for hydrostatic dynamometers and describe in detail the components used in the current system. The dynamometer performance is then illustrated with test results.
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Citation
Babbitt, G. and Moskwa, J., "Hardware Implementation Details and Test Results for a High-Bandwith, Hydrostatic Transient Engine Dynamometer System," SAE Technical Paper 970025, 1997, https://doi.org/10.4271/970025.Also In
References
- Babbitt, G.R. Moskwa, J.J. “Design of an Integrated System for a Control and Data Acquisition of a High-Bandwidth, Hydrostatic Transient Engine Dynamometer System” 1997 American Control Conference
- Seaney, S.P. “Design and Construction of a High Bandwidth Dynamometer with Absorbing and Motoring Capability,” Department of Mechanical Engineering, University of Wisconsin-Madison 1994
- Moskwa, J.J. Babbitt, G.R. Seaney, S.P. “Development of a High-Bandwidth Hydrostatic Transient Engine Dynamometer system” ISATA 96AE028 June 1996
- Longstreth, J.C. Sanders, F.A. Seaney, S.P. Moskwa, J.J. Fronczak, F.J. “Design and Construction of a High-Bandwidth Hydrostatic Dynamometer,” SAE Transactions # 930259 1993
- Dorey, R.E. Wang, D. “A Hydrostatic Dynamometer for engine Testing,” 2 nd Bath International Fluid Power Workshop Sept. 1989
- Ghaffarzadeh, H. Guebeli, M. Vaughan, N.D. “Linear Model Identification of a Hydrostatic Dynamometer through Dynamic Simulation,” 5 th Bath International Fluid Power Workshop Sept. 1992