Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:12:p2
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 12 (pt 2/5)
Character Range: 1889341–1892386

to 15 ±2 per cent of the tank's nominal capacity. The operations described in paragraphs 6.6.1.3., 6.6.1.4. and 6.6.1.5. of this annex shall be completed within a total of 36 hours and for the operations described in paragraphs 6.6.1.4. and 6.6.1.5. the vehicle shall not be exposed to temperatures above 25°C.
              6.6.1.3.  Soak
              Within 5 minutes after completing fuel drain and refill, the vehicle shall be soaked for stabilisation for at least 6 hours at an ambient temperature of 20 °C ±2 °C.
              6.6.1.4. Fuel tank depressurisation
              The tank pressure shall be subsequently released so as not to abnormally raise the inside pressure of the fuel tank. This may be done by opening the fuel cap of the vehicle. Regardless of the method of depressurisation, the vehicle shall be returned to its original condition within 1 minute.
              6.6.1.5.  Carbon canister loading and purge
              The carbon canister aged in accordance with the sequence described in paragraph 5.1. to 5.1.3.1.3. inclusive of this annex shall be loaded to 2 gram breakthrough according to the procedure described in paragraphs 6.5.5.4. to 6.5.5.4.5. inclusive to this annex, and shall be subsequently purged with 25 ±5 litres per minute with emission laboratory air. The volume of purge air shall not exceed the volume determined in accordance with the requirements of paragraph 6.6.1.5.1. This loading and purging can be done either (a) using an on-board carbon canister at a temperature of 20 °C or optionally 23 °C, or (b) by disconnecting the carbon canister. In both cases, no further relief of the tank pressure is allowed.
              6.6.1.5.1.  Determination of maximum purge volume
              The maximum purge amount  shall be determined by the following equation. In the case of OVC-HEVs, the vehicle shall be operated in charge-sustaining operating condition. This determination can also be done at a separate test or during the preconditioning drive.
              where:
                      is the cumulative purge volume rounded to the nearest 0.1 litres measured using a suitable device (e.g. flowmeter connected to the vent of the carbon canister or equivalent) over the cold start preconditioning drive described in the paragraph 6.5.3. of this annex, l;
                      is the manufacturer's nominal fuel tank capacity, l;
                       is the fuel consumption over the single purge cycle described in paragraph 6.5.3. of this annex which may be measured in either warm or cold start condition, l/100 km. For OVC-HEVs and NOVC-HEVs, fuel consumption shall be calculated according to paragraph 4.2.1. of Annex B8 of this Regulation;
                       is the theoretical distance to the nearest 0.1 km of a single purge cycle described in paragraph 6.5.3. of this annex, km.

              6.6.1.6.  Preparation of carbon canister depressurisation puff loss loading
              After completing carbon canister loading and purging, the test vehicle shall be moved