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Three Way Catalyst Modeling with Ammonia and Nitrous Oxide Kinetics for a Lean Burn Spark Ignition Direct Injection (SIDI) Gasoline Engine
Technical Paper
2013-01-1572
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A Three-Way Catalyst (TWC) model with global TWC kinetics for
lean burn DISI engines were developed and validated. The model
incorporates kinetics of hydrocarbons and carbon monoxide
oxidations, NOx reduction, water-gas and steam reforming
and oxygen storage. Ammonia (NH₃) and new nitrous oxide (N₂O)
kinetics were added into the model to study NH₃ and N₂O formation
in TWC systems.
The model was validated over a wide range of engine operating
conditions using various types of experimental data from a lean
burn automotive SIDI engine. First, well-controlled time-resolved
steady state data were used for calibration and initial model
tests. In these steady state operations, the engine was switched
between lean and rich conditions for NOx emission
control. Then, the model was further validated using a large set of
time-averaged steady state data. Temperature dependencies of NH₃
and N₂O kinetics in the TWC model were examined and well captured
by the model. Finally, the model was tested in a highly transient
FTP drive cycle with cold start conditions. Comparisons between the
data and simulation results indicate that the model is able to
predict the experimental data fairly well. The global TWC kinetics
in this study are a good starting point for further refinement.
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Authors
Citation
Gong, J. and Rutland, C., "Three Way Catalyst Modeling with Ammonia and Nitrous Oxide Kinetics for a Lean Burn Spark Ignition Direct Injection (SIDI) Gasoline Engine," SAE Technical Paper 2013-01-1572, 2013, https://doi.org/10.4271/2013-01-1572.Also In
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