A CFV Type Mini-dilution Sampling System for Vehicle Exhaust Emissions Measurement Horiba Instruments, Incorporated

Format:

Conference/Event

Author/Creator:

Silvis, William M., author.

Conference Name:

International Congress & Exposition (1999-03-01 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1999

Summary:

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

Notes:

Vendor supplied data

Publisher Number:

1999-01-0151

Access Restriction:

Restricted for use by site license