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40 C.F.R. § 1066.820

Composite calculations for FTP exhaust emissions.

§ 1066.820 Composite calculations for FTP exhaust emissions.

(a) Determine the mass of exhaust emissions of each pollutant for each FTP test interval as described in § 1066.605.

(b) Calculate the final composite gaseous test results as a mass-weighted value, e[emission]–FTPcomp, in grams per mile using the following equation:

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Where:

mc = the combined mass emissions determined from the cold-start UDDS test interval (generally known as bag 1 and bag 2), in grams. Dct = the measured driving distance from the transient portion of the cold-start test (bag 1), in miles. Dcs = the measured driving distance from the stabilized portion of the cold-start test (bag 2), in miles. mh = the combined mass emissions determined from the hot-start UDDS test interval in grams. This is the hot-stabilized portion from either the first or second UDDS (bag 2, unless you measure bag 4), in addition to the hot transient portion (bag 3). Dht = the measured driving distance from the transient portion of the hot-start test (bag 3), in miles. Dhs = the measured driving distance from the stabilized portion of the hot-start test (bag 4), in miles. Set Dhs = Dcs for testing where the hot-stabilized portion of the UDDS is not run.
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