Document ID: chunk:federal_register_of_legislation:F2024L00447:reg:0:p14
Version: federal_register_of_legislation:F2024L00447
Segment Type: reg
Provision Reference: reg 0 (pt 14/57)
Character Range: 130304–133299

averaged over a period of 2 minutes. The final concentration shall be within the manufacturer's specifications, but shall not exceed 5,000 particles per cubic-centimetre.

              4.7. Determining vehicle speed

              Vehicle speed shall be determined by at least one of the following methods:

                  (a) A sensor (e.g., optical or micro-wave sensor); if vehicle speed is determined by a sensor, the speed measurements shall comply with the requirements of paragraph 8. of Annex 5, or alternatively, the total trip distance determined by the sensor shall be compared with a reference distance obtained from a digital road network or topographic map. The total trip distance determined by the sensor shall deviate by no more than 4 per cent from the reference distance.

                  (b) The ECU; if vehicle speed is determined by the ECU, the total trip distance shall be validated according to paragraph 3. of Annex 6 and the ECU speed signal adjusted, if necessary, to fulfil the requirements of paragraph 3. of Annex 6. Alternatively, the total trip distance as determined by the ECU can be compared with a reference distance obtained from a digital road network or topographic map. The total trip distance determined by the ECU shall deviate by no more than 4 per cent from the reference distance.

                  (c) A GNSS; if vehicle speed is determined by a GNSS, the total trip distance shall be checked against the measurements of another method according to paragraph 6.5. of Annex 4.

              4.8. Check of PEMS set up

              The correctness of connections with all sensors and, if applicable, the ECU shall be verified. If engine parameters are retrieved, it shall be ensured that the ECU reports values correctly (e.g., zero engine speed [rpm] while the combustion engine is in key-on-engine-off status). The PEMS shall function free of errors and critical warnings.

              5. Emissions test

              5.1. Test start

              Sampling, measurement and recording of parameters shall begin prior to the test start (as defined in paragraph 3.8.5. of this Regulation). Before the test start it shall be confirmed that all necessary parameters are recorded by the data logger.

              To facilitate time alignment, it is recommended to record the parameters that are subject to time alignment either by a single data recording device or with a synchronised time stamp.

              5.2. Test

              Sampling, measurement and recording of parameters shall continue throughout the on-road test of the vehicle. The engine may be stopped and started, but emissions sampling and parameter recording shall continue. Repeated stalling of the engine (i.e. unintentional stopping of the engine) should be avoided during an RDE trip. Any warning signals, suggesting malfunctioning of the PEMS, shall be documented and verified. If any error signal(s) appear during the test, the test shall be invalid. Parameter