Document ID: chunk:federal_register_of_legislation:F2024L00447:reg:0:p42
Version: federal_register_of_legislation:F2024L00447
Segment Type: reg
Provision Reference: reg 0 (pt 42/57)
Character Range: 207305–211067

the calculation of instantaneous emissions [g/s] as reported by the analyser, flow-measuring instrument, sensor or the ECU. The following equation shall be applied:

              where:
mgas,i  is the mass of the exhaust component 'gas' [g/s]

ugas    is the ratio of the density of the exhaust component 'gas' and the overall density of the exhaust as listed in Table A7/1

cgas,i  is the measured concentration of the exhaust component 'gas' in the exhaust [ppm]

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

gas     is the respective component

i       number of the measurement

       Table A7/1
       Raw exhaust gas u values depicting the ratio between the densities of exhaust component or pollutant i [kg/m3] and the density of the exhaust gas [kg/m3]

Fuel            e [kg/m3]  Component or pollutant i

NOX             CO          HC                        CO2       O2         CH4

                            gas [kg/m3]

2.052           1.249       a                         1.9630    1.4276     0.715

                            ugas b,f

Diesel (B0)     1.2893      0.001593                  0.000969  0.000480   0.001523  0.001108  0.000555

Diesel (B5)     1.2893      0.001593                  0.000969  0.000480   0.001523  0.001108  0.000555

Diesel (B7)     1.2894      0.001593                  0.000969  0.000480   0.001523  0.001108  0.000555

Ethanol (ED95)  1.2768      0.001609                  0.000980  0.000780   0.001539  0.001119  0.000561

CNGc            1.2661      0.001621                  0.000987  0.000528d  0.001551  0.001128  0.000565

Propane         1.2805      0.001603                  0.000976  0.000512   0.001533  0.001115  0.000559

Butane          1.2832      0.001600                  0.000974  0.000505   0.001530  0.001113  0.000558

LPGe            1.2811      0.001602                  0.000976  0.000510   0.001533  0.001115  0.000559

Petrol (E0)     1.2910      0.001591                  0.000968  0.000480   0.001521  0.001106  0.000554

Petrol (E5)     1.2897      0.001592                  0.000969  0.000480   0.001523  0.001108  0.000555

Petrol (E10)    1.2883      0.001594                  0.000970  0.000481   0.001524  0.001109  0.000555

Ethanol (E85)   1.2797      0.001604                  0.000977  0.000730   0.001534  0.001116  0.000559

           a depending on fuel
           b at  = 2, dry air, 273 K, 101.3 kPa
           c u values accurate within 0.2% for mass composition of: C=66-76%; H=22-25%; N=0-12%
           d NMHC on the basis of CH2.93 (for THC the ugas coefficient of CH4 shall be used)
           e u accurate within 0.2% for mass composition of: C3=70-90%; C4=10-30%
           f ugas is a unitless parameter; the ugas values include unit conversions to ensure that the instantaneous emissions are obtained in the specified physical unit, i.e., g/s
As an alternative to the above method, emission rates might also be calculated with the method described in Annex A.7 of GTR 11.

       9. Calculating the instantaneous particle number emissions

The instantaneous particle number emissions [particles/s] shall be determined by multiplying the instantaneous concentration of the pollutant under consideration [particles/cm3] with the instantaneous exhaust mass flow rate [kg/s], both corrected and aligned for the transformation time and by dividing with the density [kg/m³] according to Table A7/1. If applicable, negative instantaneous 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