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Effects of In-Use Vehicle Cold Start Operation on Peak Catalyst Temperature
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English
Abstract
The effects of vehicle cold start operation and ambient air soak temperature on peak catalyst substrate temperatures were investigated by the United States Environmental Protection Agency (USEPA). Temperatures that could cause irreversible thermal deactivation of the catalyst were of concern. Internal catalyst substrate temperatures were monitored on twenty-two 1983 and 1984 model year high mileage properly maintained in-use vehicles during operation over the Federal Test Procedure (FTP) driving cycle. Vehicles were tested after nominal 20°F and 75°F ambient air temperature soaks.
During cold start operation, catalysts of carbureted test vehicles with pump or pulse secondary air systems frequently reached peak temperatures where irreversible thermal deactivation could occur. During cold start operation, fuel injected test vehicles with pulse or no secondary air injection tended to exhibit, catalyst temperatures below the range normally associated with irreversible thermal deactivation. Cold (20°F) soaking often resulted in increased catalyst temperatures during cold start vehicle operation for some carbureted vehicles tested.
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Citation
Zerafa, K., Schaffer, M., and Sabourin, M., "Effects of In-Use Vehicle Cold Start Operation on Peak Catalyst Temperature," SAE Technical Paper 880105, 1988, https://doi.org/10.4271/880105.Also In
References
- Donahue Kimberly S. Sabourin Michael A. Larson Robert E. “In-Use Catalyst Surface Area and Its Relation To HC Conversion Efficiency and FTP Emissions,” SAE Paper No. 861553 presented at SAE International Fuels and Lubricants Meeting and Exposition Philadelphia, Pennsylvania October 1986
- Hammerle R.H. Wu C.H. “Effect of High Temperatures on Three-Way Automotive Catalysts,” SAE Paper No. 840549 presented at SAE International Congress and Exposition Detroit, Michigan February-March 1934
- Otto K. Williamson W.B, Gandhi H.S. “Durability of Automotive Catalysts,” Ceramic engineering and Science Proceedings 2 May-June 1981 352 370
- IUTA presentations to manufacturers July - October 1987
- Sabourin Michael A. Larson Robert E. Donahue Kimberly S. “In-Use Performance of Catalytic Converters on Properly Maintained High Mileage Vehicles,” SAE Paper No. 860568 presented at SAE International Congress and Exposition Detroit, Michigan February 1986