Document ID: chunk:federal_register_of_legislation:F2024L00447:reg:0:p17
Version: federal_register_of_legislation:F2024L00447
Segment Type: reg
Provision Reference: reg 0 (pt 17/57)
Character Range: 138203–141393

data point t [m above sea level]

6.5. Consistency check of GNSS vehicle speed
              The vehicle speed as determined by the GNSS shall be checked for consistency by calculating and comparing the total trip distance with reference measurements obtained from either a sensor, the validated ECU or, alternatively, from a digital road network or topographic map. It is mandatory to correct GNSS data for obvious errors, e.g., by applying a dead reckoning sensor, prior to the consistency check. The original and uncorrected data shall be retained and any corrected data shall be marked. The corrected data shall not exceed an uninterrupted time period of 120 s or a total of 300 s. The total trip distance as calculated from the corrected GNSS data shall deviate by no more than 4 per cent from the reference. If the GNSS data do not meet these requirements and no other reliable speed source is available, the test shall be invalid.

              6.6. Consistency check of the ambient temperature

              The ambient temperature data shall be checked for consistency and inconsistent values corrected by substituting outliers with the average of the neighbouring values. The original and uncorrected data shall be retained and any corrected data shall be marked.

Annex 5

Specifications and calibration of PEMS components and signals
              1. Introduction

              This annex sets out the specifications and calibration of PEMS components and signals.

              2. Symbols, Parameters and Units

A             —   undiluted CO2 concentration [%]
a0            —   y-axis intercept of the linear regression line
a1            —   slope of the linear regression line
B             —   diluted CO2 concentration [%]
C             —   diluted NO concentration [ppm]
c             —   analyser response in the oxygen interference test
Cb                Measured diluted NO concentration through bubbler
cFS,b         —   full scale HC concentration in step (b) [ppmC1]
cFS,d         —   full scale HC concentration in step (d) [ppmC1]
cHC(w/NMC)    —   HC concentration with CH4 or C2H6 flowing through the NMC [ppmC1]
cHC(w/o NMC)  —   HC concentration with CH4 or C2H6 bypassing the NMC [ppmC1]
cm,b          —   measured HC concentration in step (b) [ppmC1]
cm,d          —   measured HC concentration in step (d) [ppmC1]
cref,b        —   reference HC concentration in step (b) [ppmC1]
cref,d        —   reference HC concentration in step (d) [ppmC1]
D             —   undiluted NO concentration [ppm]
De            —   expected diluted NO concentration [ppm]
E             —   absolute operating pressure [kPa]
ECO2          —   per cent CO2 quench
E(dp)         —   PEMS-PN analyser efficiency
EE            —   ethane efficiency
EH2O          —   per cent water quench
EM            —   methane efficiency
EO2           —   oxygen interference
F             —   water temperature [K]
G             —   saturation vapour pressure [kPa]
H             —   water vapour concentration [%]
Hm            —   maximum water vapour concentration [%]
NOX,dry       —   moisture-corrected mean concentration of the stabilized NOX recordings
NOX,m         —   mean