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.
Where:
mPM-cUDDS = the combined PM mass emissions determined from the cold-start UDDS test interval (bag 1 and bag 2), in grams, as calculated using Eq. 1066.605-3.
mPM-hUDDS = the combined PM mass emissions determined from the hot-start UDDS test interval (bag 3 and bag 4), in grams, as calculated using Eq. 1066.605-3. 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).
Where:
mPM = the combined PM mass emissions determined from the cold-start UDDS test interval and the first 505 seconds of the hot-start UDDS test interval (bag 1, bag 2, and bag 3), in grams, as calculated using Eqs. 1066.605-4 and 1066.605-5 .
Where:
mPM = the combined PM mass emissions determined from the cold-start UDDS test interval and the hot-start UDDS test interval (bag 1, bag 2, bag 3, and bag 4), in grams, as calculated using Eqs. 1066.605-6 and 1066.605-7 .
40 C.F.R. §1066.820