Document ID: chunk:federal_register_of_legislation:F2024L00447:reg:0:p8
Version: federal_register_of_legislation:F2024L00447
Segment Type: reg
Provision Reference: reg 0 (pt 8/57)
Character Range: 112978–116729

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Annex 4

Test procedure for vehicle emissions testing with a portable emissions measurement system (PEMS)
              1. Introduction

              This annex describes the test procedure to determine exhaust emissions from light passenger and commercial vehicles using a Portable Emissions Measurement System.

              2. Symbols, Parameters and Units

pe     —  evacuated pressure [kPa]

qvs    —  volume flow rate of the system [l/min]

ppmC1  —  parts per million carbon equivalent

Vs     —  system volume [l]

3. General requirements
              3.1. PEMS

              The test shall be carried out with a PEMS, composed of components specified in paragraphs 3.1.1. to 3.1.5. If applicable, a connection with the vehicle ECU may be established to determine relevant engine and vehicle parameters as specified in paragraph 3.2.

              3.1.1. Analysers to determine the concentration of pollutants in the exhaust gas.

              3.1.2. One or multiple instruments or sensors to measure or determine the exhaust mass flow.

              3.1.3. A GNSS receiver to determine the position, altitude and speed of the vehicle.

              3.1.4. If applicable, sensors and other appliances being not part of the vehicle, e.g. to measure ambient temperature, relative humidity and air pressure.

              3.1.5. An energy source independent of the vehicle to power the PEMS.

              3.2. Test parameters

              Test parameters, as specified in Table A4/1, shall be measured at a constant frequency of 1.0 Hz or higher and recorded and reported in accordance with the requirements of paragraph 10. of Annex 7 at a sampling frequency of 1.0 Hz. If ECU parameters are obtained, these may be obtained at a substantially higher frequency but the recording rate shall be 1.0 Hz. The PEMS analysers, flow-measuring instruments and sensors shall comply with the requirements laid down in Annexes 5 and 6.

       Table A4/1
       Test parameters

Parameter                                   Recommended unit  Source[4]

THC concentration[5],[6] (if applicable)    ppm C1            Analyser

CH4 concentration1,2,3 (if applicable)      ppm C1            Analyser

NMHC concentration1,2,3 (if applicable)     ppm C1            Analyser[7]

CO concentration1,2,3                       ppm               Analyser

CO2 concentration2                          ppm               Analyser

NOX concentration2,3                        ppm               Analyser[8]

PN concentration3                           #/m3              Analyser

Exhaust mass flow rate                      kg/s              EFM, any methods described in paragraph 7. of Annex 5.

Ambient humidity                            %                 Sensor

Ambient temperature                         K                 Sensor

Ambient pressure                            kPa               Sensor

Vehicle speed                               km/h              Sensor, GNSS, or ECU[9]

Vehicle latitude                            Degree            GNSS

Vehicle longitude                           Degree            GNSS

Vehicle altitude[10],[11]                   m                 GNSS or Sensor

Exhaust gas