Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p22
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 22/150)
Character Range: 775626–778764

apply.

              A.1.4.3.1.2.1. The valid windows shall be the windows whose duration does not exceed the maximum duration calculated from:

              where:

               Dmax  is the maximum window duration, s;

               Pmax  is the maximum engine power, kW.

              A.1.4.3.1.2.2. The test shall be void if the percentage of valid windows is less than 50 per cent.
A.1.4.3.2. Calculation of the conformity factors
The conformity factors shall be calculated for each individual window and each individual pollutant in the following way:
Where
 (in service ratio) and
 (certification ratio)
Where:
m  is the mass emission of the gaseous pollutant, mg/window, or the PM number, #/window;
mCO2 (t2,i) – mCO2 (t1,i) is the CO2 mass during the ith averaging window, kg;
mCO2,ref is the engine CO2 mass determined for the WHTC, kg;
                           mL is the mass emission of the gaseous pollutant or the PM number corresponding to the applicable limit on the WHTC, mg or # respectively.
              A.1.4.4. Calculation of the final conformity factor for the test

              A.1.4.4.1. The final conformity factor for the test (CFfinal) for each pollutant shall be calculated as follows:

               where:

                     CFcold is the conformity factor of the period of cold operation of the test, which shall be equal to the highest conformity factor of the moving averaging windows starting below 343 K (70 °C) coolant temperature, determined for that pollutant in accordance with the calculation procedures specified in paragraphs A.1.4.1. and either A.1.4.2. or, as applicable, A.1.4.3.;

                     CFwarm is the conformity factor of the period of warm operation of the test, which shall be equal to the 90th cumulative percentile of the conformity factors determined for that pollutant in accordance with the calculation procedures specified in paragraphs A.1.4.1. and either A.1.4.2. or, as applicable, A.1.4.3., when the data evaluation is started after the coolant temperature has reached 343 K (70 °C) for the first time.

Annex 8 ‑ Appendix 2 Portable measurement equipment
A.2.1. General
              The gaseous emissions shall be measured according to the procedure set out in Appendix 1 to this annex. The present appendix describes the characteristics of the portable measurement equipment that shall be used to perform such tests.
A.2.2. Measuring equipment
              A.2.2.1. Gas analysers general specifications

               The PEMS gas analysers specification shall meet the requirements set out in paragraph 9.3.1 of Annex 4. The rise time of the analyser installed in the PEMS measurement system shall not exceed 3.5 seconds.
              A.2.2.2. Gas analysers technology
              The gases shall be analysed using the technologies specified in paragraph 9.3.2.of Annex 4.
              The oxides of nitrogen analyser may also be of the Non-Dispersive Ultra Violet (NDUV) type.
A.2.2.3. Sampling of gaseous emissions
The sampling probes shall meet the requirements defined in paragraphs A.2.1.2. and A.2.1.3. of Appendix 2 to Annex 4 to