C2-2021-05306. Improvements for Heavy-Duty Engine and Vehicle Test Procedures, and Other Technical Amendments

Corrections

In rule document 2021-05306, appearing on pages 34308-34590, in the issue of Tuesday, June 29, 2021, make the following corrections:

§ 1036.301

[Corrected]

1. On page 34380, in the first column, in the sixth line above Table 1, “Mreduction” should read “ M_reduction ”.

§ 1036.540

[Corrected]

2. On page 34396, in the first column, at the top of the page, before (i) insert:

“(3) Run GEM for each simulated vehicle configuration as follows:”

§ 1037.528

[Corrected]

3. On page 34474, in the third column, after amendatory instruction 152, the section heading should read:

§ 1037.528

Coastdown procedures for calculating drag area ( C d A ).

§ 1037.540

[Corrected]

4. On page 34477, in the second column, in the tenth line below Eq. 1037.540-2, “ p̄_circuit-2 ” should read “ p_circuit-2 ”

§ 1037.550

[Corrected]

5. On page 34479, in the third column in paragraph (f)(4), “ k α_B = 4.0” should read “ k_aB = 4.0”.

6. On page 34481, in Table 1 of § 1037.550, in the first column, in the first line, “Slope, a;₁ ” should read “Slope, a₁ ”.

§ 1037.560

[Corrected]

7. On page 34485, in the first column, paragraph (f) introductory text should read:

(f) Calculate the mean power loss, P_loss, at each test point as follows:

8. On the same page, in the second column, (f)(2) should read:

(2) Calculate P_loss as the mean power loss from all measurements at a given test point.

9. On the same page, in the third column (f)(3) should read:

(3) The following example illustrates a calculation of P_loss:

* * * * *

10. On the same page, in the first column paragraph (g) introductory text should read:

(g) Create a table with the mean power loss, P_loss, corresponding to each test point for input into GEM. Express wheel angular speed in r/min to one decimal place; express output torque in N·m to two decimal places; express power loss in kW to four decimal places.

11. On the same page, in the third column, (h)(3) should read:

(3) Determine P_loss of untested axles for each speed and torque setpoint based on a linear relationship between your declared power loss and axle ratio as follows:

* * * * *

12. On page 34486, in the first column, (h)(4) should read:

(4) Select declared values of P_loss for untested configurations that are at or above the values you determined in paragraph (h)(3) of this section.

§ 1037.565

[Corrected]

13. On page 34487, in the first column, paragraph (f) introductory text should read:

(f) Calculate the mean power loss, P_loss, at each operating condition as follows:

* * * * *

14. On the same page, in the second column, the definition for f_nout and paragraph (f)(2) introductory text should read as follows:

f_nout = mean output shaft speed from paragraph (e)(6) of this section in rad/s. Let f_nout = 0 for all tests with the transmission in neutral. See paragraph (f)(2) of this section for calculating f_nout as a function of f_nin instead of measuring f_nout.

(2) For transmissions that are configured to not allow slip, you may calculate f_nout based on the gear ratio using the following equation:

* * * * *

15. On the same page, in the third column, paragraph (f)(3), paragraph (f)(4) introductory text, and the eighth line after paragraph (f)(4) introductory text should read as follows:

(3) Calculate P_loss as the mean power loss from all measurements at a given operating condition.

(4) The following example illustrates a calculation of P_loss:

* * * * *

P_loss,3 = 4292 W = 4.292 kW

* * * * *

16. On page 34488, in the first column, lines 1-3 from the top of the page should read:

(g) Create a table with the mean power loss, P_loss, corresponding to each operating condition for input into GEM.

§ 1037.570

[Corrected]

17. On page 34489, beginning in the second column, lines 17-20 from the top should read as follows:

(e) Calculate the mean torque ratio, l , at each tested speed ratio, v, as follows:

(1) Calculate μ at each tested speed ratio as follows:

18. On the same page, in the same column, in the 6th through 10 lines after Eq. 1037.570-1, paragraphs (e)(2) and (3) introductory text should read as follows:

(2) Calculate l as the average of the two values of μ at each tested speed ratio.

(3) The following example illustrates a calculation of l :

* * * * *

19. On the same page, in the third column, paragraphs (f) introductory text, (f)(1) introductory text, (f)(2), and (f)(3) introductory text should read as follows:

(f) Calculate the mean capacity factor, k , at each tested speed ratio, n , as follows:

(1) Calculate K at each tested speed ratio as follows:

* * * * *

(2) Calculate k as the average of the two values of K at each tested speed ratio.

(3) The following example illustrates a calculation of k :

* * * * *

20. On the same page, in the first column, beginning in the 7th line from the bottom, paragraph (g) should read as follows:

(g) Create a table of GEM inputs showing l and k at each tested speed ratio, n. Express l to two decimal places; express k to one decimal place; express n to two decimal places.

§ 1037.805

[Corrected]

21. On page 34493, in Table 2 to § 1037.805—Symbols for Quantities, in the first column,

a. line 7 should read: a_g

b. line 8 should read: a₀

c. line 9 should read: a₁

22. On page 34494, in the second column, in Table 3 to § 1037.805—Superscripts, in the first column, the second and third lines should read:

Double overbar (such as y )

§ 1065.307

[Corrected]

23. On page 34538, in the first column, in (c)(13), the first sentence should read as follows:

(13) Use the arithmetic means, y ̄ _i, and reference values, y_refi, to calculate least-squares linear regression parameters and statistical values to compare to the minimum performance criteria specified in Table 1 of this section.

24. On page 34539, in the second column, in paragraph (e)(3), (v) and (vi) should read as follows:

(v) For linearity verification of a fuel flow rate meter, m _max is the manufacturer's specified maximum fuel rate of the lowest-power engine expected during testing.

(vi) For linearity verification of a DEF flow rate meter, m _max is 10% of the manufacturer's specified maximum fuel rate of the lowest-power DEF-using engine expected during testing.

§ 1065.530

[Corrected]

25. On page 34547, in the first column, paragraph (g)(5) should read as follows:

(g) * * *

(5) If you perform carbon balance error verification, verify carbon balance error as specified in the standard-setting part and § 1065.543. Calculate and report the three carbon balance error quantities for each test interval; carbon mass absolute error for a test interval ( ε_aC), carbon mass rate absolute error for a test interval ( ε_aCrate), and carbon mass relative error for a test interval ( ε_rC). For duty cycles with multiple test intervals, you may calculate and report the composite carbon mass relative error, ε_rCcomp, for the whole duty cycle. If you report ε_rCcomp, you must still calculate and report ε_{aC, εaCrate,} and ε_rC for each test interval.

* * * * *

§ 1065.543

[Corrected]

26. On page 34547, in the second column, paragraph (b)(1) should read:

(b) * * *

(1) Calculate carbon balance error quantities as described in § 1065.643. The three quantities for individual test intervals are carbon mass absolute error, ε_aC, carbon mass rate absolute error, ε_aCrate, and carbon mass relative error, ε_rC. Determine ε_{aC, εaCrate,} and ε_rC for all test intervals. You may determine composite carbon mass relative error, ε_rCcomp, as a fourth quantity that optionally applies for duty cycles with multiple test intervals.

27. On the same page, in the same column, Eq. 1065.543-1 should read:

28. On the same page, in the third column, Eq. 1065.543-2 should read:

29. On the same page, in the same column, lines 12-17 should read:

(iii) The carbon mass relative error limit, Lε_rC, is 0.020 for comparision to the absolute value of ε_rC, and optionally the absolute value of ε_rCcomp.

§ 1065.602

[Corrected]

30. On page 34554, in the third column, in (l)(1)(ii), in the 8th line down, “pumping, P  ” should read “pumping, P_frict.”

§ 1065.643

[Corrected]

31. On page 34559, in the first column, Eq. 1065.643-7 should read:

ò_aC = m_Cexh − m_Cfluid − m_Cair

32. On page the same page, in the third column, Eq. 1065.643-8 should read:

33. On the same page, beginning in the same column, Example: for Eq. 1065.643-8 should read:

ε_aC = −6.7 g

t = 1202.2 s = 0.3339 hr

34. On the same page, in the second column, Eq. 1065.643-9 should read:

35. On the same page, beginning in the first column, Example: for Eq. 1065.643-9 should read:

ε_aC = −6.7 g

m_Cfliud = 975.3 g

m_Cair = 278.6 g

36. On page 34560, at the top of the page, Eq. 1065.643-10 should read:

37. On the same page, in the first column, the formula before (iii) should read:

38. On the same page, in the same column, the formula before amendatory instruction 353 should read:

§ 1065.650

[Corrected]

39. On page 34561, in the third column, the fourth line after Eq. 1065.650-8 should read:

n ̄ _dexh = 57.692 mol/s

40. On page 34563, in the first column, the ninth through eleventh lines after Eq. 1065.650-19 should read:

P = mean steady-state power over the test interval as described in paragraph (e) of this section.

§ 1065.655

[Corrected]

41. On page the same page, in Table 1 of § 1065.655, delete column 1 and 2 headings and insert first entry to read as follows:

Table 1 of § 1065.655—Symbols and Subscripts for Chemical Balance Equations

Xdil/exh	amount of dilution gas or excess air per mole of exhaust.
*         *         *         *         *         *         *

§ 1065.1005

[Corrected]

42. On page 34576, in Table 1 of § 1065.1005, in the Symbol column, the first line should read “ α ”.

§ 1066.1005

[Corrected]

43. On page 34585, in Table 1 of § 1066.1005, in the Symbol column, the fifth line should read “ A_m ”