Oxygen storage dominated three-way catalyst modeling
Jeremias Bickel
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Jeremias Bickel, Oxygen storage dominated three-way catalyst modeling (2021), Logos Verlag, Berlin, ISBN: 9783832585068
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Beschreibung / Abstract
The key to achieve optimal emission performance of a modern three-way catalyst (TWC) under transient engine operating conditions is to maintain an optimal oxidation state of the oxygen storage material inside the washcoat of the catalyst.
This work demonstrates how simplified kinetic models can be developed that allow for accurately predicting the oxygen storage level under dynamic operation.
This work demonstrates how simplified kinetic models can be developed that allow for accurately predicting the oxygen storage level under dynamic operation.
Inhaltsverzeichnis
- BEGINN
- 1 Introduction
- 1.1 Three-way catalysts
- 1.2 Oxygen storage materials
- 1.3 Thesis scope and outline
- 2 Lambda value, oxygen storage, and lumped concentrations
- 3 Measurements
- 3.1 Experimental setup and employed samples
- 3.2 Overview of measurements and setpoint calculation
- 3.3 Lambda sweep experiment (LS)
- 3.4 Lambda sweep experiment with lambda cycling (LSC)
- 3.5 Temperature sweep experiment with lambda-cycling (TSC)
- 3.6 Lambda sensors
- 3.7 Reproducibility
- 3.8 Summary
- 4 Mathematical Model
- 4.1 Three-way catalyst models
- 4.2 Model formulation
- 4.3 Summary
- 5 Parameter identification
- 5.1 Residual definition
- 5.2 Residual minimization
- 5.3 Parameter identifiability and subset selection
- 6 Lambda sweep modeling
- 6.1 Fresh catalysts
- 6.2 Aged catalysts
- 6.3 Summary
- 7 Temperature sweep modeling
- 7.1 Fresh catalyst
- 7.2 Aged catalysts
- 7.3 Space velocity effects
- 7.4 Summary
- 8 Model extensions and application
- 8.1 Full model
- 8.2 Mixed model
- 8.3 Summary
- 9 Conclusions and outlook
- A Optimization algorithms
- B Selection of optimization algorithm
- B.1 Lumped model
- B.2 Full model
- C Further model details
- D Mass spectrometer setup
- Bibliography