Voglio sapere a riguardo di…

34581

Federal Register / Vol. 86, No. 122 / Tuesday, June 29, 2021 / Rules and Regulations 46 ASTM D703915a Reapproved 2020, Standard Test Method for Sulfur in Gasoline, Diesel Fuel, Jet Fuel, Kerosine, Biodiesel, Biodiesel Blends, and Gasoline-Ethanol Blends by Monochromatic Wavelength Dispersive X-ray Fluorescence Spectrometry, approved May 1, 2020 ASTM
D7039, IBR approved for 1065.703b and 1065.710b.
47 ASTM F147109, Standard Test Method for Air Cleaning Performance of a HighEfficiency Particulate Air Filter System, approved March 1, 2009
ASTM F1471, IBR approved for 1065.1001.

PART 1066VEHICLE-TESTING
PROCEDURES
375. The authority citation for part 1066 continues to read as follows:

Authority: 42 U.S.C. 74017671q.

376. Amend 1066.1 by revising paragraph g to read as follows:

1066.1

Applicability.

g For additional information regarding the test procedures in this part, visit our website at www.epa.gov, and in particular https www.epa.gov/
vehicle-and-fuel-emissions-testing/
vehicle-testing-regulations.
377. Amend 1066.135 by revising paragraph a1 to read as follows:
1066.135

Linearity verification.

a
1 Use instrument manufacturer recommendations and good engineering judgment to select at least ten reference values, yrefi, that cover the range of values that you expect during testing to prevent extrapolation beyond the verified range during emission testing.
We recommend selecting zero as one of your reference values. For each range calibrated, if the deviation from a leastsquares best-fit straight line is 2% or less of the value at each data point,
concentration values may be calculated by use of a straight-line curve fit for that range. If the deviation exceeds 2% at any point, use the best-fit nonlinear equation that represents the data to within 2% of each test point to determine concentration. If you use a gas divider to blend calibration gases, you may verify that the calibration curve produced names a calibration gas within 2% of its certified concentration.
Perform this verification between 10
and 60% of the full-scale analyzer range.

378. Amend 1066.210 by revising paragraph d3 to read as follows:

1066.210

Dynamometers.

d
3 The load applied by the dynamometer simulates forces acting on the vehicle during normal driving according to the following equation:

VerDate Sep<11>2014

01:55 Jun 29, 2021

Jkt 253001

379. Amend 1066.255 by revising paragraph c to read as follows:
1066.255

c Procedure. Perform this verification by following the dynamometer manufacturers specifications to establish a parasitic loss curve, taking data at fixed speed intervals to cover the range of vehicle speeds that will occur during testing.
You may zero the load cell at a selected speed if that improves your ability to determine the parasitic loss. Parasitic loss forces may never be negative. Note that the torque transducers must be mathematically zeroed and spanned prior to performing this procedure.

380. Amend 1066.260 by revising paragraph c4 to read as follows:
1066.260 Parasitic friction compensation evaluation.

PO 00000

2
FCerror = 2I. t vinit

Frm 00275

Fmt 4701

Sfmt 4700

2

- vfina1

Eq. 1066.260-1

Parasitic loss verification.

c
4 Calculate the power equivalent of friction compensation error, FCerror, using the following equation:

Where:
I = dynamometer inertia setting.
t = duration of the measurement interval, accurate to at least 0.01 s.
vinit = the roll speed corresponding to the start of the measurement interval, accurate to at least 0.05 mi/hr.
vfinal = the roll speed corresponding to the end of the measurement interval, accurate to at least 0.05 mi/hr.

Example:
I = 2000 lbm = 62.16 lbfs2/ft t = 60.0 s vinit = 9.2 mi/hr = 13.5 ft/s vfinal = 10.0 mi/hr = 14.7 ft/s
FC

error
=

62 16 13.5 2 -14.7 2

2-60.00

FCerror = 17.5 ftlbf/s =0.032 hp

381. Amend 1066.265 by revising paragraph d1 to read as follows:

E:FRFM29JNR2.SGM

29JNR2

ER29JN21.266

t = elapsed time in the driving schedule as measured by the dynamometer, in seconds. Let ti1 = 0 for i = 0.
M = the measured vehicle mass, in lbm or kg.
ag = acceleration of Earths gravity = 9.80665
m/s2.

ER29JN21.265

Where:
FR = total road-load force to be applied at the surface of the roll. The total force is the sum of the individual tractive forces applied at each roll surface.
i = a counter to indicate a point in time over the driving schedule. For a dynamometer operating at 10-Hz intervals over a 600second driving schedule, the maximum value of i should be 6,000.
A = a vehicle-specific constant value representing the vehicles frictional load in lbf or newtons. See subpart D of this part.
Gi = instantaneous road grade, in percent. If your duty cycle is not subject to road grade, set this value to 0.
B = a vehicle-specific coefficient representing load from drag and rolling resistance, which are a function of vehicle speed, in lbf/mi/hr or Ns/m. See subpart D of this part.
v = instantaneous linear speed at the roll surfaces as measured by the dynamometer, in mi/hr or m/s. Let vi1
= 0 for i = 0.
C = a vehicle-specific coefficient representing aerodynamic effects, which are a function of vehicle speed squared, in lbf/
mi/hr2 or Ns2/m2. See subpart D of this part.
Me = the vehicles effective mass in lbm or kg, including the effect of rotating axles as specified in 1066.310b7.

ER29JN21.264

lotter on DSK11XQN23PROD with RULES2

Eq. 1066.210-1