Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:5:p6
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 5 (pt 6/36)
Character Range: 434340–437571

4.3.1.1.

           (1)       Based on C1 equivalent.

       IN ANNEX III, APPENDIX 2:

       Sections 3.1, 3.4, 3.8.3 and 5 of Appendix 2 do not apply solely to diesel engines. They also apply to ethanol-fuelled       diesel engines.

              4.2.                           The conditions for the test should be arranged so that the air temperature and the humidity measured at the engine intake is set to standard conditions during the test run. The standard should be 6 ± 0,5 g water per kg dry air at a temperature interval of 298 ± 3 K. Within these limits no further NOx correction should be made. The test is void if these conditions are not met.

              4.3.                           Calculation of the emission mass flow

              4.3.1                        Systems with constant mass flow

              For systems with heat exchanger, the mass of the pollutants (g/test) shall be determined from the following equations:

               (1)    NOx mass = 0,001587 × NOx conc × KH,D × MTOT W (ethanol fuelled engines)

               (2)    COx mass = 0,000966 × COconc × MTOT W (ethanol fuelled engines)

              (3)    HCmass = 0,000794 × HCconc × MTOT W (ethanol fuelled engines) where,
              NOx conc, COconc, HCconc (1), NMHCconc = average background corrected concentrations over the cycle from integration (mandatory for NOx and HC) or bag measurement, ppm;

              MTOTW = total mass of diluted exhaust gas over the cycle as determined in Section 4.1, kg.

       4.3.1.1. Determination of the background corrected concentrations

              The average background concentration of the gaseous pollutants in the dilution air shall be subtracted from measured concentrations to get the net concentrations of the pollutants. The average values of the background concentrations can be determined by the sample bag method or by continuous measurement with integration. The following formula shall be used.
              where,

                   conc = concentration of the respective pollutant in the diluted exhaust gas, corrected by the amount of the respective pollutant contained in the dilution air, ppm;

              conce = concentration of the respective pollutant measured in the diluted exhaust gas, ppm; concd = concentration of the respective pollutant measured in the dilution air, ppm;
              DF = dilution factor.

              The dilution factor shall be calculated as follows:
              where,

              CO2conce = concentration of CO2 in the diluted exhaust gas, % vol HCconce = concentration of HC in the diluted exhaust gas, ppm C1 COconce = concentration of CO in the diluted exhaust gas, ppm
              FS = stoichiometric factor

              Concentrations measured on dry basis shall be converted to a wet basis in accordance with Annex III, Appendix 1, Section 4.2.

              The stoichiometric factor shall, for the general fuel composition CHαOβNγ, be calculated as follows:

              Alternatively, if the fuel composition is not known, the following stoichiometric factors may be used:

        FS (Ethanol) = 12,3

       4.3.2. Systems with flow compensation

              For systems without