This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A Sampling System for the Measurement of PreCatalyst Emissions from Vehicles Operating Under Transient Conditions
Annotation ability available
Sector:
Language:
English
Abstract
A proportional sampler for vehicle feedgas and tailpipe emissions has been developed that extracts a small, constant fraction of the total exhaust flow during rapid transient changes in engine speed. Heated sampling lines are used to extract samples either before or after the catalytic converter. Instantaneous exhaust mass flow is measured by subtracting the CVS dilution air volume from the total CVS volume. This parameter is used to maintain a constant dilution ratio and proportional sample. The exhaust sample is diluted with high-purity air or nitrogen and is delivered into Tedlar sample bags. These transient test cycle weighted feedgas samples can be collected for subsequent analysis of hydrocarbons and oxygenated hydrocarbon species. This “mini-diluter” offers significant advantages over the conventional CVS system. The concentration of the samples are higher than those collected from the current CVS system because the dilution ratio can be optimized depending on the fuel. Contaminants in dilution air are eliminated since dilution is carried out using high-purity gases. This report describes the design, construction, and experimental studies to validate the performance of the mini-diluter for the collection and measurement of total carbon and individual hydrocarbon species in vehicle exhaust ahead of the catalytic converter.
Recommended Content
Authors
- Jon McLeod - General Motors Corp.
- Don Nagy - General Motors Corp.
- Pat Schroeder - General Motors Corp.
- Sue Thiel - General Motors Corp.
- Mark A. Dearth - Ford Motor Co.
- Alex D. Colvin - Ford Motor Co.
- Tim Webb - Ford Motor Co.
- Keith R. Carduner - Ford Motor Co.
- Dennis Schuetzle - Ford Motor Co.
- Rick Middleton - Chrysler Motors Proving Grounds
- Ann M. Schlenker - Chrysler Motors Proving Grounds
Citation
McLeod, J., Nagy, D., Schroeder, P., Thiel, S. et al., "A Sampling System for the Measurement of PreCatalyst Emissions from Vehicles Operating Under Transient Conditions," SAE Technical Paper 930141, 1993, https://doi.org/10.4271/930141.Also In
References
- Burns, V.R. Benson, J.D. Hochhauser, A.M. Koehl, W.J. Kreucher, W.M. Reuter, R.M. “Description of Auto/Oil Air Quality Improvement Research Program” S A E 912320 1991
- The Federal Clean Air Act, Title II, Public Law 101-549 November 1990 The Low Emissions Vehicle/Clean Fuels Program California Air Resources Board September 1990
- Schuetzle, D. Jensen, T.E. Nagy, D. Prostack, A. Hochauser, A. “Analytical Chemistry and Auto Emissions.” Anal. Chem. 1991 63 1149A 1159A
- Code of Federal Regulations , Parts 86-99, 86.155-78 Title 40-Protection of Environment Office of the Federal Register, National Archives and Records Administration Washington, D.C. 1991 429 430
- Wiers, W.W. Scheffler, C.E. “Carbon Dioxide (CO2) Tracer Technique for Modal Mass Exhaust Emission Measurement.” SAE 720126 1972
- Staab, J. Klingenberg, H. “Strategy for the Development of a New Multicomponent Exhaust Emissions Measurement Technique.” SAE 830437 1983
- Butler, J.W. Maker, P.D. Korniski, T.J. Haack, L.P. Mckelvy, F.E. Colvin, A.D. “A System for On-line Measurement of Multicomponent Emissions and Engine Operating Parameters.” SAE 851657 1985
- Mcleod Jon October 1992