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Emissions Correlation of Heavy-Duty Transient Test Facilities
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English
Abstract
A correlation program was established between heavy-duty engine transient test facilities in order to determine emission variabilities within and among laboratories. Significant differences between the laboratories observed for all emission components were smaller compared to data reported previously. For gaseous emissions among-lab standard deviation was significantly, for particulates only slightly higher than within-lab standard deviation. Two groups of laboratories were found that correlate rather well within the respective group.
Normalizing the standard deviations to 1991 emission regulations showed that oxides of nitrogen and hydrocarbon variabilities were about 16 %, particulate variability about 45 % of the regulated emission values. Therefore, particulate measurement has to be improved considerably.
Cycle work was found to influence among-lab variability of all components. Besides, sample zone temperature affected the absolute particulate, and dilution ratio the absolute hydrocarbon emissions. Amendments to the test procedure are recommended to improve measurement accuracy.
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Citation
Stein, H., Ekermo, A., and Treiber, P., "Emissions Correlation of Heavy-Duty Transient Test Facilities," SAE Technical Paper 892492, 1989, https://doi.org/10.4271/892492.Also In
References
- Code of Federal Regulations, Title 40, Protection of Environment, Part 86, Subpart K - Selective Enforcement Auditing of New Gasoline-Fueled and Diesel Heavy-Duty Engines and Light-Duty Trucks.
- Barsic N. J. “Variability of Heavy-Duty Diesel Engine Emissions for Transient and 13-Mode Steady-State Test Methods” SAE Paper 840346 1984
- Doerffel K. Zwanziger H. “Zur multivariaten Auswertung von Ringversuchen (On the Multivariate Interpretation of Interlaboratory Tests)” Z. Anal. Chem. 329 1 6 1987
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- Reichel S. Pischinger F. F. Lepperhoff G. “Influence on Particles in Diluted Diesel Engine Exhaust Gas” SAE Paper 831333 1983
- MacDonald J. S. Plee S. L. D'Arcy J. B. Schreck R. M. “Experimental Measurements of the Independent Effects of Dilution Ratio and Filter Temperature on Diesel Exhaust Particulate Samples” SAE Paper 800185 1980
- Frisch L. E. Johnson J. H. Leddy D. G. “Effect of Fuels and Dilution Ratio on Diesel Particulate Emission” SAE Paper 790417 1979