Document ID: chunk:federal_register_of_legislation:F2024L00447:reg:0:p37
Version: federal_register_of_legislation:F2024L00447
Segment Type: reg
Provision Reference: reg 0 (pt 37/57)
Character Range: 193352–196692

the reference signal

a0  is the y intercept of the regression line

The standard error of estimate (SEE) of y on x and the coefficient of determination (r2) shall be calculated for each measurement parameter and system.
                  (d) The linear regression parameters shall meet the requirements specified in Table A6/2.

              4.3. Requirements

              The linearity requirements given in Table A6/2 shall be fulfilled. If any permissible tolerance is not met, corrective action shall be taken and the validation shall be repeated.

       Table A6/2
       Linearity requirements of calculated and measured exhaust mass flow

Measurement parameter/system  a0              Slope a1      Standard error of the estimate SEE  Coefficient of determination

                                                                                                r2

Exhaust mass flow             0.0 ± 3.0 kg/h  1.00 ± 0.075  ≤10 % max                           ≥ 0.90

Annex 7

Determination of instantaneous emissions
              1. Introduction

              This annex describes the procedure to determine the instantaneous mass and particle number emissions [g/s; #/s], following application of the data consistency rules of Annex 4. The instantaneous mass and particle number emissions shall then be used for the subsequent evaluation of a RDE trip and the calculation of the intermediate and final emission result as described in Annex 11.

              2. Symbols, Parameters and Units

α            —       molar hydrogen ratio (H/C)

β            —       molar carbon ratio (C/C)

γ            —  molar sulphur ratio (S/C)

δ            —       molar nitrogen ratio (N/C)

Δtt,i        —  transformation time t of the analyser [s]

Δtt,m        —  transformation time t of the exhaust mass flow meter [s]

ε            —  molar oxygen ratio (O/C)

ρe           —  density of the exhaust

ρgas         —  density of the exhaust component 'gas'

λ            —  excess air ratio

λi           —  instantaneous excess air ratio

A/Fst        —  stoichiometric air-to-fuel ratio [kg/kg]

cCH4         —  concentration of methane

cCO          —  dry CO concentration [%]

cCO2         —  dry CO2 concentration [%]

cdry         —  dry concentration of a pollutant in ppm or per cent volume

cgas,i       —  instantaneous concentration of the exhaust component 'gas' [ppm]

cHCw         —  wet HC concentration [ppm]

cHC(w/NMC)   —  HC concentration with CH4 or C2H6 flowing through the NMC [ppmC1]

cHC(w/oNMC)  —  HC concentration with CH4 or C2H6 bypassing the NMC [ppmC1]

ci,c         —  time-corrected concentration of component i [ppm]

ci,r         —  concentration of component i [ppm] in the exhaust

cNMHC        —  concentration of non-methane hydrocarbons

cwet         —  wet concentration of a pollutant in ppm or per cent volume

EE           —  ethane efficiency

EM           —  methane efficiency

Ha           —  intake air humidity [g water per kg dry air]

i            —  number of the measurement

mgas,i       —  mass of the exhaust component 'gas' [g/s]

qmaw,i       —  instantaneous intake air mass flow rate [kg/s]

qm,c         —  time-corrected exhaust mass flow rate [kg/s]

qmew,i       —  instantaneous exhaust mass flow rate [kg/s]

qmf,i        —  instantaneous fuel mass flow rate