Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p12
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 12/150)
Character Range: 747195–750664

methane emissions. For the purposes of the calculation of the conformity factors pursuant to paragraphs A.1.4.2.3. and A.1.4.3.2., the applicable limit shall in that case be the methane emission limit only.

For engines fuelled with gases other than natural gas, the manufacturer, technical service or Type Approval Authority may choose to measure the total hydrocarbon (THC) emissions instead of measuring the non-methane hydrocarbon emissions. In that case, the emission limit for the total hydrocarbon emissions is the same as shown in paragraph 5.3. of this Regulation for non-methane hydrocarbon emissions. For the purposes of the calculations of the conformity factors pursuant to paragraphs A.1.4.2.3. and A.1.4.3.2., the applicable limit shall in that case be the non-methane emission limit.
A.1.2. Test Procedure
              A.1.2.1. General requirements
              The tests shall be carried out with a PEMS comprised of:
              A.1.2.1.1. Gas analysers and PM number analysers to measure the concentrations of regulated pollutants in the exhaust gas;
              A.1.2.1.2. An exhaust mass flow meter based on the averaging Pitot or equivalent principle;
              A.1.2.1.3. A Global Positioning System (hereinafter "GPS");
              A.1.2.1.4. Sensors to measure the ambient temperature and pressure;
              A.1.2.1.5. A connection with the vehicle ECU).
A.1.2.2. Test parameters
              The parameters as specified in Table 1 shall be measured and recorded at a constant frequency of 1.0 Hz or higher. The original raw data shall be kept by the manufacturer and shall be made available, upon request, to the Type Approval Authority:
       Table 1
       Test parameters
Parameter                         Unit    Source
THC concentration1                ppm     Gas analyser
CO concentration1                 ppm     Gas analyser
NOx concentration1                ppm     Gas analyser
CO2 concentration1                ppm     Gas analyser
CH4 concentration1, 2             ppm     Gas analyser
PM number concentration           #/cm3   PM number analyser
Dilution setting (if applicable)  -       PM number analyser
Exhaust gas flow                  kg/h    Exhaust Flow Meter (hereinafter EFM)
Exhaust temperature               K       EFM
Ambient temperature3              K       Sensor
Ambient pressure                  kPa     Sensor
Engine torque4                    Nm      ECU or Sensor
Engine speed                      rpm     ECU or Sensor
Engine fuel flow                  g/s     ECU or Sensor
Engine coolant temperature        K       ECU or Sensor
Engine intake air temperature3    K       Sensor
Vehicle ground speed              km/h    ECU and GPS
Vehicle latitude                  degree  GPS
Vehicle longitude                 degree  GPS

       Notes:
         1 Measured or corrected to a wet basis
         2 Only for gas engines fuelled with natural gas
         3 Use the ambient temperature sensor or an intake air temperature sensor
         4 The recorded value shall be either (a) the net brake engine torque according to paragraph A.1.2.4.4. of this appendix or (b) the net brake engine torque calculated from the torque values according to paragraph A.1.2.4.4. of this appendix."

A.1.2.2.1. Data reporting format
               Emission values as well as any other relevant parameters shall be reported and exchanged as csv-formatted data file. Parameter values shall be separated by a