Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:10:p14
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 10 (pt 14/32)
Character Range: 1308140–1311569

with the linear coefficient f*1,i set to f1,A. f1,A is calculated as follows:
              where:
                  E is the cycle energy demand as defined in paragraph 5. of this annex, Ws;
                  i is the subscript denoting vehicles L, H or ind;
                  HR is test vehicle H as described in paragraph 4.2.1.2.3.2. of Annex B4;
                  LR is test vehicle L as described in paragraph 4.2.1.2.3.2. of Annex B4.
              3.3. PM
              3.3.1. Calculation
              PM shall be calculated using the following two equations:
              where exhaust gases are vented outside tunnel;
              and:
              where exhaust gases are returned to the tunnel;
              where:
                   is the volume of diluted exhaust gases (see paragraph 2. of this annex), under standard conditions;
                   is the volume of diluted exhaust gas flowing through the particulate  sampling filter under standard conditions;
                   is the mass of particulate matter collected by one or more sample filters, mg;
                   is the distance driven corresponding to the test cycle, km.
              3.3.1.1. Where correction for the background particulate mass from the dilution system has been used, this shall be determined in accordance with paragraph 2.1.3.1. of Annex B6. In this case, particulate mass (mg/km) shall be calculated using the following equations:
              in the case that the exhaust gases are vented outside the tunnel;
              and:
              in the case that the exhaust gases are returned to the tunnel;
              where:
                   is the volume of tunnel air flowing through the background particulate filter under standard conditions;
                   is the particulate mass from the dilution air, or the dilution tunnel background air, as determined by the one of the methods described in paragraph 2.1.3.1. of Annex B6;
                   is the dilution factor determined in paragraph 3.2.1.1.1. of this annex.
              Where application of a background correction results in a negative result, it shall be considered to be zero mg/km.
              3.3.2. Calculation of PM using the double dilution method
              where:
                   is the volume of diluted exhaust gas flowing through the particulate sample filter under standard conditions;
                   is the volume of the double diluted exhaust gas passing through the particulate sampling filters under standard conditions;
                   is the volume of the secondary dilution air under standard conditions.
              Where the secondary diluted sample gas for PM measurement is not returned to the tunnel, the CVS volume shall be calculated as in single dilution, i.e.:
              where:
                      is the measured volume of diluted exhaust gas in the dilution  system following extraction of the particulate sample under               standard conditions.
              4. Determination of PN
              PN shall be calculated using the following equation:
              where:
               is the particle number emission, particles per kilometre;
                   is the volume of the diluted exhaust gas in litres per test (after primary dilution only in the case of double dilution) and corrected to standard conditions (273.15 K (0 °C) and 101.325 kPa);
                   is