Document ID: chunk:federal_register_of_legislation:F2024C00356:reg:20:p18
Version: federal_register_of_legislation:F2024C00356
Segment Type: reg
Provision Reference: reg 20 (pt 18/19)
Character Range: 274419–277540

per cubic centimetre figure from the emissions test including the full duration of the drive cycle. If the volumetric mean concentration results () from the particle number counter are not output at standard conditions (273.2 K and 101.33 kPa), then the concentrations should be corrected to those conditions (),
         =  mean particle concentration reduction factor of the volatile particle remover at the dilution setting used for the test,
 d       =  distance corresponding to the operating cycle expressed in kilometres,
         =  shall be calculated from the following equation:

 Where:
 Ci      =  a discrete measurement of particle concentration in the diluted gas exhaust from the particle counter expressed in particles per cubic centimetre and corrected for coincidence,
 n       =  total number of discrete particle concentration measurements made during the operating cycle,
 n          shall be calculated from the following equation:

 Where:
 T       =  time duration of the operating cycle expressed in seconds,
 f       =  data logging frequency of the particle counter expressed in Hz.

              6.6.9. Allowance for mass emissions from vehicles equipped with periodically regenerating devices
               When the vehicle is equipped with a periodically regenerating system as defined in Regulation No. 83, 06 series of amendments, Annex 13: Emissions test procedure for a vehicle equipped with a periodically regenerating system:
              6.6.9.1. The provisions of Annex 13 shall apply for the purposes of particulate mass measurements only and not particle number measurements.
              6.6.9.2. For particulate mass sampling during a test in which the vehicle undergoes a scheduled regeneration, the filter face temperature shall not exceed 192 °C.
              6.6.9.3. For particulate mass sampling during a test when the regenerating device is in a stabilized loading condition (i.e. the vehicle is not undergoing a regeneration), it is recommended that the vehicle has completed > 1/3 of the mileage between scheduled regenerations or that the periodically regenerating device has undergone equivalent loading off the vehicle.
               For the purposes of Conformity of Production testing, the manufacturer may ensure that this is included within the evolution coefficient. In this case, paragraph 8.2.3.2.2. of this Regulation is replaced by paragraph 6.6.9.3.1. of this annex.
              6.6.9.3.1. If the manufacturer wishes to run in the vehicles, ("x" km, where x  3,000 km for vehicles equipped with a positive ignition engine and x  15,000 km for vehicles equipped with a compression ignition engine and where the vehicle is at > 1/3 distance between successive regenerations), the procedure will be as follows:
               (a) The pollutant emissions (type I) will be measured at zero and at "x"   km on the first tested vehicle;
               (b) The evolution coefficient of the emissions between zero and "x" km   will be calculated for each of the pollutants:

               This may be less than 1,
               (a) The other vehicles