This section describes how to calculate exhaust emissions. Determine emission results for each pollutant to at least one more decimal place than the applicable standard. Apply the deterioration factor, then round the adjusted figure to the same number of decimal places as the emission standard. Compare the rounded emission levels to the emission standard for each emission data vehicle. In the case of NOX + HC standards, apply the deterioration factor to each pollutant and then add the results before rounding.
Where:
Ywm = Weighted mass emissions of each pollutant (i.e., CO2, HC, CO, or NOX) in grams per vehicle kilometer and if appropriate, the weighted carbon mass equivalent of total hydrocarbon equivalent, in grams per vehicle kilometer.
Yct = Mass emissions as calculated from the transient phase of the cold-start test, in grams per test phase.
Ys = Mass emissions as calculated from the stabilized phase of the cold-start test, in grams per test phase.
Dct = The measured driving distance from the transient phase of the cold-start test, in kilometers.
Ds = The measured driving distance from the stabilized phase of the cold-start test, in kilometers.
Yht = Mass emissions as calculated from the transient phase of the hot-start test, in grams per test phase.
Dht = The measured driving distance from the transient phase of the hot-start test, in kilometers.
HCmass = Vmix * DensityHC * (HCconc/1,000,000)
NOxmass = Vmix * DensityNO2 * KH * (NOxconc/1,000,000)
COmass = Vmix * DensityCO * (COconc/1,000,000)
CO2mass = Vmix * DensityCO2 * (CO2conc/100)
CH3OHmass = Vmix * DensityCH3OH * (CH3OHconc/1,000,000)
HCHOmass = Vmix * DensityHCHO * (HCHOconc/1,000,000)
Vmix * DensityN2O * (N2Oconc/1,000,000)
Where:
Where:
Where:
Where:
Note: If a CO instrument which meets the criteria specified in § 86.511 is used and the conditioning column has been deleted, COem can be substituted directly for COe and COdm must be substituted directly for COd.
Where:
Where:
Where:
Where:
Where:
Where:
N2Oe = Nitrous oxide concentration of the dilute exhaust sample as measured, in ppm.
N2Od = Nitrous oxide concentration of the dilution air as measured, in ppm.
Then:
40 C.F.R. §86.544-90