Effects of In-Use Vehicle Cold Start Operation on Peak Catalyst Temperature

880105

02/01/1988

Event
SAE International Congress and Exposition
Authors Abstract
Content
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.
Meta TagsDetails
DOI
https://doi.org/10.4271/880105
Pages
12
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.
Additional Details
Publisher
Published
Feb 1, 1988
Product Code
880105
Content Type
Technical Paper
Language
English