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Transient Drive Cycle Modeling of Supercharged Powertrains for Medium and Heavy Duty On-Highway Diesel Applications
Technical Paper
2012-01-1962
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The problem with traditional drive cycle fuel economy analysis
is that kinematic (backward looking) models do not account for
transient differences in charge air handling systems. Therefore,
dynamic (forward looking) 1D performance simulation models were
created to predict drive cycle fuel economy which encompass all the
transient elements of fully detailed engine and vehicle models. The
transient-capable technology of primary interest was mechanical
supercharging which has the benefit of improved boost response and
"time to torque." The benefits of a supercharger clutch
have also been evaluated.
The current US class 6-8 commercial vehicle market exclusively
uses turbocharged diesel engines. Three vehicles and baseline
powertrains were selected based on a high-level review of vehicle
sales and the used truck marketplace. Fuel economy over drive
cycles was the principal output of the simulation work. All
powertrains are based on EPA 2010 emission regulations. Two
methodologies for NOx reduction were also included: high
percentage EGR only (for in-cylinder NOx reduction) and
low percentage EGR + SCR aftertreatment catalyst. - Class 6
Delivery truck, mid-6L displacement, FTP72 drive cycle, - Class 8
Vocational truck, 13L engine, HD-UDDS drive cycle, and Class 8 Line
haul, 15L engine, HHDDT Cruise drive cycle.
Two new modeling methodologies using GT-Suite were developed in
the process. Detailed dynamic models are more CPU intensive but
provided output that cannot be accounted for with faster running
steady state or kinematic models. The improved boost response of
supercharged configurations exhibited improved vehicle performance
without increasing the rated power/torque levels. Various levels of
downspeeding are applied which allow either improved performance or
improved fuel economy, or both, compared to the baseline
turbocharged powertrain. Supercharger sizing, supercharger
placement (pre- or post-compressor in a series-boosted
configuration), and EGR loop configuration were also evaluated. A
fuel economy improvement has been realized in all three vehicle
applications.
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Citation
Birckett, A., Tomazic, D., Bowyer, S., Bevan, K. et al., "Transient Drive Cycle Modeling of Supercharged Powertrains for Medium and Heavy Duty On-Highway Diesel Applications," SAE Technical Paper 2012-01-1962, 2012, https://doi.org/10.4271/2012-01-1962.Also In
References
- Keidel, S. Wetzel, P. Biller, B. Bevan, K. et al. “Diesel Engine Fuel Economy Improvement Enabled by Supercharging and Downspeeding,” SAE Technical Paper 2012-01-1941 2012
- Morris, B. Wetzel, P. Pryor, M. Hughes, D. “Roots type Superchargers for Fuel Economy in Heavy Duty Diesels: Hardware and Testing on a Demonstrator Vehicle,” China SAE Technical Paper Changchun, China 2012
- Mattarelli, E. “Comparison among different 2-Stage Supercharging systems for HSDI Diesel engines,” SAE Technical Paper 2009-24-0072 2009 10.4271/2009-24-0072
- Reifarth, S. Angstrom, H. “Transient EGR in a High-Speed DI Diesel Engine for a set of different EGR-routings,” SAE Int. J. Engines 3 1 1071 1078 2010 10.4271/2010-01-1271
- Keller, P. Joergl, V. Weber, O. Czarnowski, R. “Enabling Components for Future Clean Diesel Engines,” SAE Technical Paper 2008-01-1530 2008 10.4271/2008-01-1530
- Zelenka, P. Aufinger, H. Reczek, W. Cartellieri, W. “Cooled EGR - A Key Technology for Future Efficient HD Diesels,” SAE Technical Paper 980190 1998 10.4271/980190
- Leet, J. Friesen, T. Shadbourne, A. “EGR's Effect on Oil Degradation and Intake System Performance,” SAE Technical Paper 980179 1998 10.4271/980179
- Heywood, J.B. “Internal Combustion Engine Fundamentals,” McGraw-Hill New York 978-0-07-028637-5 1988
- Gamma Technologies Inc. GT-Suite Application Manual (Version 7.0) Gamma Technologies Inc. Westmont, IL 2009