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Emission Levels and Catalyst Temperatures as a Function of Ignition-Induced Misfire
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Abstract
EPA has conducted investigations into the effects on emission levels and internal catalyst temperatures versus ignition-induced misfire. These data were obtained on a 1990 Buick LeSabre. These data indicate that: (1) a two percent misfire rate was sufficient to cause hydrocarbon (HC) emission levels to exceed the existing emission standard of 0.41 gm/mile; (2) a four to five percent ignition-induced misfire rate caused the HC emission levels to reach 0.82 gm/mile, or twice the standard, (3) typical FTP average internal catalyst temperatures are below 514°C; and (4) maximum internal catalyst temperatures were below the threshold temperature for thermal degradation (870°C) during ignition-induced misfire below 17 percent.
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Tyree, C., "Emission Levels and Catalyst Temperatures as a Function of Ignition-Induced Misfire," SAE Technical Paper 920298, 1992, https://doi.org/10.4271/920298.Also In
References
- “Effect of High Temperatures on Three-Way Automotive Catalysts.” SAE Paper No. 840549 Hammerle R.H. Wu C.H.
- “High Temperature Substrate and Catalyst System,” SAE Paper No. 850553 Durga V. Rao Nageswar
- “Thermal Response of Monolithic Catalytic Converters During Sustained Engine Misfiring: A Computational Study,” SAE Paper No. 881591 Oh Se H.
- “Operating Characteristics of Zirconia Galvanic Cells (Lambda Sensors) in Automotive Closed-Loop Emission Control Systems,” SAE Paper No. 920289 Bozek John W. Evans Richard Tyree Clifford D. Zerafa Kenneth L.