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Federal Register / Vol. 86, No. 122 / Tuesday, June 29, 2021 / Rules and Regulations N

386. Amend 1066.605 by revising paragraphs c4 and h2i to read as follows:
1066.605 Mass-based and molar-based exhaust emission calculations.

flow=

c
4 For vehicles at or below 14,000
pounds GVWR, calculate HC
concentrations, including dilution air background concentrations, as described in this section, and as described in 1066.635 for NMOG. For emission testing of vehicles above 14,000 pounds GVWR, with fuels that contain 25% or more oxygenated compounds by volume, calculate THCE and NMHCE
concentrations, including dilution air background concentrations, as described in 40 CFR part 1065, subpart I.

h
2
i Varying flow rate. If you continuously sample from a varying exhaust flow rate, calculate Vflow using the following equation:

i=l
Where:
Dt = 1/record
Eq. 1066.60511
Example:
N = 505
CVS1= 0.276 m3/s Q
CVS2= 0.294 m3/s Q
record = 1 Hz Using Eq. 1066.60511:
Dt = 1/1 = 1 s CVS505 1
VCVS = 0.276 + 0.294 + Q
3 VCVS = 170.721 m

387. Amend 1066.610 by revising paragraph d to read as follows:
1066.610 Dilution air background correction.

= 18 _82

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paragraph c2. Set the temperature to 72F in full automatic control for the whole test, allowing the vehicle to adjust the air temperature and direction of the airflow.
3 Multiple-zone systems. For vehicles that have separate driver and passenger controls or separate front and rear controls, you must set all temperature and fan controls as described in paragraphs c1 and 2 of this section, except that rear controls need not be set to defrost the front window.
4 Alternative test procedures. We may approve the use of other settings under 40 CFR 86.1840 if a vehicles climate control system is not compatible with the provisions of this section.

389. Amend 1066.801 by revising paragraph e to read as follows:
1066.801 Applicability and general provisions.

e The following figure illustrates the FTP test sequence for measuring exhaust and evaporative emissions:
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c During the test, operate the vehicles interior climate control system with the heat on and air conditioning off. You may not use any supplemental auxiliary heat during this testing. You may set the heater to any temperature and fan setting during vehicle preconditioning.
1 Manual and automatic temperature control. Unless you rely on full automatic control as specified in paragraph c2 of this section, take the following steps to control heater settings:
i Set the climate control system as follows before the first acceleration t =
20 s, or before starting the vehicle if the climate control system allows it:
A Temperature. Set controls to maximum heat. For automatic temperature control systems that allow the operator to select a specific temperature, set the heater control to 72F or higher.

B Fan speed. Set the fan speed to full off or the lowest available speed if a full off position is not available.
C Airflow direction. Direct airflow to the front window window defrost mode.
D Air source. If independently controllable, set the system to draw in outside air.
ii At the second idle of the test cycle, which occurs 125 seconds after the start of the test, set the fan speed to maximum. Complete by 130 seconds after the start of the test. Leave temperature and air source settings unchanged.
iii At the sixth idle of the test interval, which occurs at the deceleration to zero miles per hour 505
seconds after the start of the test, set the fan speed to the lowest setting that maintains air flow. Complete these changes by 510 seconds after the start of the test. You may use different vent and fan speed settings for the remainder of the test. Leave the temperature and air source settings unchanged.
2 Full automatic control. Vehicles with full automatic control systems may instead operate as described in this
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1066.710 Cold temperature testing procedures for measuring CO and NMHC
emissions and determining fuel economy.

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N=3
DF1 = 14.40
t1 = 505 s DF2 = 24.48
t2 = 867 s DF3 = 17.28
t3 = 505 s
1 . sos+ 1- . 867 + 1- sos 14.40
24.48
17.28

388. Amend 1066.710 by revising paragraph c to read as follows:

01:55 Jun 29, 2021

Example:

-

VerDate Sep<11>2014

Eq. 1066.610-4
Where:
N = number of test intervals i = test interval number t = duration of the test interval DF = dilution factor over the test interval
505 + 867 + 505

DF =

d Determine the time-weighted dilution factor, DFw, over the duty cycle using the following equation:

LQi -f Eq. 1066.605-10

w
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