The Importance Of Reversible Deactivation Dynamics For On-Board Catalyst Control And OBD Systems

2002-01-0067

03/04/2002

Event
SAE 2002 World Congress & Exhibition
Authors Abstract
Content
Transient measurements of pre- and post-catalyst exhaust gas components and AFR are used to investigate the relationship between post-catalyst AFR and tailpipe emissions. This relationship is critical to the ability of on-board oxygen storage dominated models to predict emissions levels. The results suggest that under rich, or rich-biased conditions, dynamic deactivation processes significantly reduce catalyst efficiency, and that modeling oxygen storage effects alone may result in over-prediction of tailpipe pollutants. Catalyst deactivation is also shown to be correlated to hydrogen-induced distortion in the Exhaust Gas Oxygen (EGO) sensors used for measuring AFR. The dynamics of reversible catalyst deactivation are therefore important both for its direct effect on dynamic conversion efficiency, and for its indirect effect on dual EGO sensor dependent catalyst control and OBD strategies
Meta TagsDetails
DOI
https://doi.org/10.4271/2002-01-0067
Pages
11
Citation
Peyton Jones, J., Jackson, R., and Roberts, J., "The Importance Of Reversible Deactivation Dynamics For On-Board Catalyst Control And OBD Systems," SAE Technical Paper 2002-01-0067, 2002, https://doi.org/10.4271/2002-01-0067.
Additional Details
Publisher
Published
Mar 4, 2002
Product Code
2002-01-0067
Content Type
Technical Paper
Language
English