Document ID: chunk:federal_register_of_legislation:F2023L01526:body:0:p50
Version: federal_register_of_legislation:F2023L01526
Segment Type: other
Provision Reference: 
Character Range: 140216–143116

the soak, the test vehicle, with the engine shut off and the test vehicle windows and luggage compartment opened shall be moved into the measuring chamber.

       5.1.5.6. The vehicle shall be connected to the mains. The REESS is charged according to failure charge procedure as specified in paragraph 5.1.5.9. below.

       5.1.5.7. The enclosure doors are closed and sealed gas-tight within two minutes from electrical interlock of the failure charge step.

       5.1.5.8. The start of a failure charge for hydrogen emission test period begins when the chamber is sealed. The hydrogen concentration, temperature and barometric pressure are measured to give the initial readings CH2i, Ti and Pi for the failure charge test.

        These figures are used in the hydrogen emission calculation (Annex 8, paragraph 6). The ambient enclosure temperature T shall not be less than 291 K and no more than 295 K during the charging failure period.

5.1.5.9.  Procedure of charging failure

       The charging failure is carried out with the suitable charger and consists of the following steps:

           (a) Charging at constant power during t'1;

           (b) Charging at maximum current as recommended by the manufacturer during 30 minutes. During this phase, the charger shall supply maximum current as recommended by the manufacturer.

       5.1.5.10. The hydrogen analyser shall be zeroed and spanned immediately before the end of the test.

       5.1.5.11. The end of test period occurs t'1 + 30 minutes after the beginning of the initial sampling, as specified in paragraph 5.1.5.8. above. The times elapsed are recorded. The hydrogen concentration, temperature and barometric pressure are measured to give the final readings CH2f, Tf and Pf for the charging failure test, used for the calculation in Annex 8, paragraph 6.

       5.2. Component based test

       5.2.1. REESS preparation

       The ageing of REESS shall be checked, to confirm that the REESS has performed at least 5 standard cycles (as specified in Annex 8, Appendix 1).

       5.2.2. Discharge of the REESS

        The REESS is discharged at 70 per cent ± 5 per cent of the nominal power of the system.

       Stopping the discharge occurs when minimum SOC as specified by the manufacturer is reached.

       5.2.3. Soak

        Within 15 minutes of the end of the REESS discharge operation specified in paragraph 5.2.2. above, and before the start of the hydrogen emission test, the REESS shall be soaked at 293 K ± 2 K for a minimum period of 12 hours and a maximum of period of 36 hours.

       5.2.4. Hydrogen emission test during a normal charge

       5.2.4.1. Before the completion of the REESS's soak period, the measuring chamber shall be purged for several minutes until a stable hydrogen background is obtained. The enclosure mixing fan(s) shall also be turned on at this time.

       5.2.4.2. The