Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:10:p11
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 10 (pt 11/30)
Character Range: 550914–553964

background correction is to be applied, the dilution air mass (md) through the filter and the particulate mass (mf,d) shall be recorded. If more than one measurement was made, the quotient mf,d/md shall be calculated for each single measurement and the values averaged.

        6.2.  Partial Flow Dilution System

              The final reported test results of the particulate emission shall be determined through the following steps. Since various types of dilution rate control may be used, different calculation methods for qmedf apply. All calculations shall be based upon the average values of the individual modes during the sampling period.

        6.2.1. Isokinetic systems

              where ra corresponds to the ratio of the cross sectional areas of the isokinetic probe and the exhaust pipe:

        6.2.2. Systems with measurement of CO2 or NOx concentration

              where:

              cwE = wet concentration of the tracer gas in the raw exhaust

              cwD = wet concentration of the tracer gas in the diluted exhaust

              cwA = wet concentration of the tracer gas in the dilution air

         Concentrations measured on a dry basis shall be converted to a wet basis according to section 5.2 of this Appendix.

        6.2.3. Systems with CO2 measurement and carbon balance method (*)

         where:

         c(CO2)D = CO2 concentration of the diluted exhaust
              c(CO2)A = CO2 concentration of the dilution air (concentrations in vol % on wet basis)

              This equation is based upon the carbon balance assumption (carbon atoms supplied to the engine are emitted as CO2) and deter- mined through the following steps:
         and

        6.2.4. Systems with flow measurement

        6.3.  Full Flow Dilution System

              All calculations shall be based upon the average values of the individual modes during the sampling period. The diluted exhaust gas flow qmdew shall be determined in accordance with section 4.1 of Appendix 2 to this Annex. The total sample mass msep shall be calculated in accordance with section 6.2.1 of Appendix 2 to this Annex.

        6.4.  Calculation of the Particulate Mass Flow Rate

              The particulate mass flow rate shall be calculated as follows. If a full flow dilution system is used, qmedf as determined according to section 6.2 shall be replaced with qmdew as determined according to section 6.3.

i = 1, … n

              The particulate mass flow rate may be background corrected as follows:

         where D shall be calculated in accordance with section 5.4.1 of Appendix 2 to this Annex.

    (*) The value is only valid for the reference fuel specified in Annex IV.'

       (v)     Former section 6 is renumbered as section 7.

  (f)         Appendix 2 is amended as follows:

       (i)      Section 3 is replaced by the following:

        '3.  EMISSIONS TEST RUN

              At the manufacturers request, a dummy test may be run for conditioning of the engine and exhaust system before the