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Study on Parameters Affecting NMOG Measurements and a Method to Improve its Accuracy
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Abstract
Nissan has developed a non-methane organic gas (NMOG) emission measuring method based on California Air Resources Board (CARB) procedures.1) In addition, a system to analyze the chemical species present in the exhaust gases at Low Emission Vehicles (LEV) and Ultra Low Emission Vehicles (ULEV) levels has been created.
It was found that when using an electrically heated catalyst (EHC) to achieve the low emissions for LEV and ULEV levels, the interference between exhaust HC species and the contamination of the analyzing system are a serious problem for the measurement of speciated emissions.
The methyl tertiary butyl ether (MTBE) contained in reformulated gasoline can interfere with HC speciation in the Chromatogram, requiring that the automatically speciated results be checked by a trained operator.
The low exhaust HC emissions of bags 2 and 3 in the Federal Test Procedure (FTP) are nearly equal to that of the background air utilized in the constant volume sampler (CVS) dilution. For this reason, the HC level in the background air affects the result of speciated emissions and the Specific Reactivity (SR, refer to Appendix A). Measurements using purified dilution air were effective to the speciated emissions stability. In addition, the contamination of the exhaust sampling bags must be minimized to maintain the analysis accuracy. The accuracy of speciation measurements was improved by these procedure modifications.
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Iwaklri, Y., Oogane, H., Tsuchida, H., and Ishihara, K., "Study on Parameters Affecting NMOG Measurements and a Method to Improve its Accuracy," SAE Technical Paper 930387, 1993, https://doi.org/10.4271/930387.Also In
References
- California Air Resources board “Proposed Regulations For Low-Emission Vehicles and Clean Fuels” Technical Support Document August 13 1990
- Kojima K. Hirota T. Yakusiji K. Iwakiri Y. Oda K. Akutsu Y. “Effect of Reformulated Gasoline and Methanol of Exhaust Emissions” SAE Paper 912431 1991
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- Hamai K Mitsumoto H. Iwakiri Y. Ishihara K. Ishii M. “Effect of Clean Fuels (Reformulated Gasolines, M85, and CNG) on Automotive Emissions SAE Paper 922380 1992
- Stump Fred D. Dropkin David L. “Gas Chromatographic Method for Quantitative Determination of C2 to C13 Hydrocarbons in Roadway Vehicle Emissions” Analytical Chemistry 57 13 November 1985
- Akutsu Y. Kanno H. Hasegawa T. Oota M. “Development of Dry Analytical Method for Formaldehyde in Exhaust Emission” JSAE 22 4 October 1991