Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:9:p15
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 9 (pt 15/71)
Character Range: 248978–253446

1,03      0,83–1,03                                                  0,89–1,03
                                                                                                                                                                                                                                                                                                                                                                           (0,83–1,03) (*)
Coefficient of determination, r2                                                                                                                                                                                                                                                              min 0,9700        min 0,8800                                                 min 0,9100
                                                                                                                                                                                                                                                                                              (min 0,9500) (*)  (min 0,7500) (*)                                           (min 0,7500) (*)
Y intercept of the regression line, b                                                                                                                                                                                                                                                         ± 50 min-1        ± 20 Nm or ± 2 %                                           ± 4 kW or ± 2 %
                                                                                                                                                                                                                                                                                                                (± 20 Nm or ± 3 %) (*) of max torque whichever is greater  (± 4 kW or ± 3 %) (*) of max power whichever is greater
(*) Until 1 October 2005, the figures shown in brackets may be used for the type-approval testing of gas engines. The Commission shall report on the development of gas engine technology to confirm or modify the regression line tolerances applicable to gas engines given in this table.

              Point deletions from the regression analyses are permitted where noted in Table 7.

        Table 7

        Permitted point deletions from regression analysis
         Conditions                                       Points to be deleted
Full load and torque feedback < torque reference  Torque and/or power
No load, not an idle point, and torque feedback   Torque and/or power
> torque reference
No load/closed throttle, idle point and speed     Speed and/or power
> reference idle speed

4.                                CALCULATION OF THE GASEOUS EMISSIONS

4.1.                            Determination of the diluted exhaust gas flow

              The total diluted exhaust gas flow over the cycle (kg/test) shall be calculated from the measurement values over the cycle and the corresponding calibration data of the flow measurement device (V0 for PDP or KV for CFV, as determined in Annex III, Appendix 5, Section 2). The following formulae shall be applied, if the temperature of the diluted exhaust is kept constant over the cycle by using a heat exchanger (± 6 K for a PDP-CVS, ± 11 K for a CFV-CVS, see Annex V, Section 2.3).

              For the PDP-CVS system:

        MTOTW = 1,293 × V0 × Np × (pB – p1) × 273 / (101,3 × T)

              where:

              MTOTW = mass of the diluted exhaust gas on wet basis over the cycle, kg

              V0 = volume of gas pumped per revolution under test conditions, m3/rev NP = total revolutions of pump per test
              pB = atmospheric pressure in the test cell, kPa

              p1 = pressure depression below atmospheric at pump inlet, kPa

              T = average temperature of the diluted exhaust gas at pump inlet over the cycle, K

              For the CFV-CVS system:

    MTOTW = 1,293 × t × Kv × pA / T0,5

              where:

              MTOTW =  mass of the diluted exhaust gas on wet basis over the cycle, kg t = cycle time, s
              Kv =  calibration coefficient of the critical flow venturi for standard conditions  pA = absolute pressure at venturi inlet, kPa
              T = absolute temperature at venturi inlet, K

              If a system with