A CFV Type Mini-dilution Sampling System for Vehicle Exhaust Emissions Measurement

1999-01-0151

03/01/1999

Event
International Congress & Exposition
Authors Abstract
Content
The traditional method for sampling vehicle exhaust has been the constant volume sampler (CVS) technique as described in the Code of Federal Regulations (CFR). This method dilutes the entire exhaust output from the vehicle, meters the mixture, and takes a proportional sample for measurement. The Mini-diluter sampling method reverses this process by first metering a small sample and then diluting to a fixed dilution ratio. This approach offers new opportunities to improve the quality of the sample measurement. This is especially interesting considering the lower emissions levels from ULEVs. The usefulness of this idea will depend on the development of stable and repeatable devices to implement it. This paper describes the operation of and presents results from a Mini-dilution system that uses critical flow venturis to provide a stable and repeatable dilution. In addition, it describes a water vapor adjustment technique to compensate for exhaust gas composition changes on cold start emissions tests.
Meta TagsDetails
DOI
https://doi.org/10.4271/1999-01-0151
Pages
11
Citation
Silvis, W., Harvey, R., and Dageforde, A., "A CFV Type Mini-dilution Sampling System for Vehicle Exhaust Emissions Measurement," SAE Technical Paper 1999-01-0151, 1999, https://doi.org/10.4271/1999-01-0151.
Additional Details
Publisher
Published
Mar 1, 1999
Product Code
1999-01-0151
Content Type
Technical Paper
Language
English