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Uncertainties in Filter Mass Measurements Made to Determine Compliance with the 2007 Diesel PM Standard
ISSN: 1946-3952, e-ISSN: 1946-3960
Published April 20, 2009 by SAE International in United States
Citation: Swanson, J., Kittelson, D., and Dikken, D., "Uncertainties in Filter Mass Measurements Made to Determine Compliance with the 2007 Diesel PM Standard," SAE Int. J. Fuels Lubr. 2(1):708-717, 2009, https://doi.org/10.4271/2009-01-1516.
The 2007 Diesel particulate matter (DPM) standard of 0.01 g/bhp-hr represents a 90% reduction of the previous standard and corresponds to roughly 100 micrograms (μg) gained on the filter sample used to determine compliance. The factors that influence the accuracy and precision by which this filter can be weighed are analyzed and quantified. The total uncertainty, representing best and typical cases, is between 1 and 5 μg. These uncertainties are used to compute the total uncertainty of the brake specific emission calculation. This uncertainty also depends on flowrate uncertainty, face velocity, and secondary dilution ratio. For a typical case, the total fractional uncertainty is in the range of ∼5 – 70% at 10% of the standard and ∼1 – 10% at 90% of the standard.