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Lean NOx Trap Modeling for Vehicle Systems Simulations

Journal Article
2010-01-0882
ISSN: 1946-3952, e-ISSN: 1946-3960
Published April 12, 2010 by SAE International in United States
Lean NOx Trap Modeling for Vehicle Systems Simulations
Sector:
Citation: Gao, Z., Chakravarthy, K., Daw, C., and Conklin, J., "Lean NOx Trap Modeling for Vehicle Systems Simulations," SAE Int. J. Fuels Lubr. 3(1):468-485, 2010, https://doi.org/10.4271/2010-01-0882.
Language: English

Abstract:

A transient, one-dimensional lean NOx trap (LNT) model is described and implemented for vehicle systems simulations. The model accounts for conservation of chemical species and thermal energy, and includes the effects of O₂ storage and NOx storage (in the form of nitrites and nitrates). Nitrites and nitrates are formed by diffusion of NO and NO₂, respectively, into sorbent particles, and reaction rates are controlled by chemical kinetics and solid-phase diffusion. The model also accounts for thermal aging and sulfation by means of empirical correlations, which have been derived from laboratory experiments. Example simulation results using the Powertrain Systems Analysis Toolkit (PSAT) are presented.