Document ID: chunk:federal_register_of_legislation:F2024L00447:reg:0:p43
Version: federal_register_of_legislation:F2024L00447
Segment Type: reg
Provision Reference: reg 0 (pt 43/57)
Character Range: 210760–213853

emission values shall enter all subsequent data evaluations. All significant digits of preceding results shall enter the calculation of the instantaneous emissions. The following equation shall apply:

              where:

PNi     is the particle number flux [particles/s]

cPN,i   is the measured particle number concentration [#/m3] normalized at 0 °C

qmew,i  is the measured exhaust mass flow rate [kg/s]

ρe      is the density of the exhaust gas [kg/m3] at 0 °C (Table A7/1)

       10. Data exchange

Data Exchange: The data shall be exchanged between the measurement systems and the data evaluation software by a standardised data exchange file found at the same weblink[26] as the UN Regulation.
Any pre-processing of data (e.g. time correction according to paragraph 3 of this annex, vehicle speed correction according to paragraph 4.7. of Annex 4 or the correction of the GNSS vehicle speed signal according to paragraph 6.5. of Annex 4) shall be done with the control software of the measurement systems and shall be completed before the data exchange file is generated.

Annex 8

Assessment of overall trip validity using the moving averaging window method
              1. Introduction

              The Moving Averaging Window method shall be used to assess the overall trip dynamics. The test is divided in sub-sections (windows) and the subsequent analysis aims at determining whether the trip is valid for RDE purposes. The 'normality' of the windows shall be assessed by comparing their CO2 distance-specific emissions with a reference curve obtained from the vehicle CO2 emissions measured in accordance with the WLTP test.

              For compliance with this Regulation, the method shall be applied using the 4-phase and the 3-phase WLTC requirements.

              2. Symbols, Parameters and Units

              Index (i) refers to the time step

              Index (j) refers to the window

              Index (k) refers to the category (t=total, ls=low speed, ms=medium speed, hs=high speed) or to the CO2 characteristic curve (cc)

      coefficients of the CO2 characteristic curve

      coefficients of the CO2 characteristic curve

      CO2 mass, [g]

      CO2 mass in window j, [g]

      total time in step i, [s]

      duration of a test, [s]

      actual vehicle speed in time step i, [km/h]

      average vehicle speed in window j, [km/h]

      upper tolerance for the vehicle CO2 characteristic curve, [%]

      lower tolerance for the vehicle CO2 characteristic curve, [%]

              3. Moving averaging windows

              3.1. Definition of averaging windows
              The instantaneous CO2 emissions calculated according to Annex 7 shall be integrated using a moving averaging window method, based on a reference CO2 mass.

              The usage of the reference CO2 mass is illustrated in Figure A8/2. The principle of the calculation is as follows: The RDE distance-specific CO2 mass emissions are not calculated for the complete data set, but for sub-sets of the complete data set, the length of these sub-sets being