Vehicle Emissions from Road Aged Passive Distributed Converter System for ULEV Emission Regulations

972848

10/01/1997

Event
International Fuels & Lubricants Meeting & Exposition
Authors Abstract
Content
A real world aging study was performed on a distributed converter system to investigate ULEV potential and aging aspects. Two V-6 vehicles were fitted with 0.7 Liter Pd close mounted catalysts on each exhaust manifold and a traditional 2.8 Liter three-way underfloor catalyst. These vehicles were then driven in a high mileage fleet while tracking emission results every 10K miles up to 50K miles. At the end of 50K miles the system met ULEV requirements for CO and NOx but NMHC exceeded the target. Verification of aging was done by chemically cleaning the close coupled catalyst and by comparison to a dynamometer aged set. The results showed that most of the degradation in NMHC performance was due to poisoning with little effect from thermal aging. With most of the CO and NOx abatement being done in the underfloor catalyst their degradation is mainly thermal. Although a large volume of catalyst was used, it was determined that the traditional underfloor catalyst could be reduced by 1.3 Liters and still maintain similar results. It should be noted that a systems approach and well maintained vehicles were instrumental in achieving the results presented.
Meta TagsDetails
DOI
https://doi.org/10.4271/972848
Pages
10
Citation
Richmond, R., Goulette, D., and Thoreson, T., "Vehicle Emissions from Road Aged Passive Distributed Converter System for ULEV Emission Regulations," SAE Technical Paper 972848, 1997, https://doi.org/10.4271/972848.
Additional Details
Publisher
Published
Oct 1, 1997
Product Code
972848
Content Type
Technical Paper
Language
English