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A CFV Type Mini-dilution Sampling System for Vehicle Exhaust Emissions Measurement
Technical Paper
1999-01-0151
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
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.
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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.Also In
References
- .McLeod J. et al. “A sampling system for the measurement of precatalyst emissions from vehicles operating under transient conditions,” SAE 930141 1993
- Silvis W. M. “Mini-Dilution Sampling Systems for Vehicle Exhaust Emissions Measurement,” Autotest '96 1996
- Munson B. R. et al. “Fundamentals of Fluid Mechanics,” 2nd New York John Wiley & Sons, Inc. 1994 528
- Tayama A. et al. “A Study of a Gasoline-Fueled Near-Zero-Emission Vehicle Using an Improved Emission Measurement System,” SAE 982555 1998
- Thiel W. et al. “Niedrige Abgasgrenzwerte fuer Kalifornien und EU3, was bedeutet das fuer die Abgasmesstechnik,” Informationsveranstaltung “Abgasmesstechnik,” 1996