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TECHNICAL PAPERS

Dynamic Optimization of Lean Burn Engine Aftertreatment

[+] Author and Article Information
Jun-Mo Kang

University of Michigan, Ann Arbor, MI 48109

Ilya Kolmanovsky

Ford Motor Company, 2101 Village Drive, P.O. Box 2053, Dearborn, MI 48121-2053e-mail: ikolmano@ford.com

J. W. Grizzle

University of Michigan, 4221 EECS Bldg., 1301 Beal Ave., Ann Arbor, MI 48109-2122e-mail: grizzle@umich.edu

J. Dyn. Sys., Meas., Control 123(2), 153-160 (Jun 13, 2000) (8 pages) doi:10.1115/1.1368114 History: Received June 13, 2000
Copyright © 2001 by ASME
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References

Figures

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Complete model for emission system
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European drive cycle for emissions evaluation
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Fuel economy versus NOX emissions of optimal policy with calibrations and from full optimization, over the Euro-cycle. The DISI engine, TWC models are quasi-static. The LNT NOX filling and emptying is dynamically updated.
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Normalized optimal trajectories of TWC oxygen storage level and LNT NOX storage level, with NOX emissions constrained to Stage IV NOX Emissions Standard. The maximum capacities of TWC and LNT, Ctwc and Clnt, were set of 0.5 g and 0.15 g, respectively.
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Fuel economy satisfying Stage IV NOX emission standard of Euro-cycle with various maximum trap capacity of LNT
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Fuel economy satisfying Stage IV NOX emission standard of Euro-cycle with various maximum oxygen storage capacity of TWC
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Fuel economy and NOX emissions over Euro-cycle with, and without homogeneous lean mode
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Fuel economy versus NOX emissions of optimal policy with two state (dynamic TWC oxygen storage, dynamic LNT NOX storage, static LNT temperature) and three state (dynamic TWC oxygen storage, dynamic LNT NOX storage, dynamic LNT temperature) model
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Normalized optimal trajectories of TWC oxygen storage level and LNT NOX storage level of three state model, with NOX emissions constrained to Stage IV NOX Emissions Standard
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Emission system with free gear ratio
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Performance comparison of standard gear shift and optimally scheduled gear shift
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Fuel economy and NOX emissions over Euro-cycle with scheduled control policy of infinite horizon optimization and optimal policy of finite horizon optimization
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Normalized trajectories of TWC oxygen storage level and LNT NOX storage level of scheduled infinite horizon solution, with NOX emissions constrained to Stage IV NOX emissions standard

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