Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:9:p35
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 9 (pt 35/37)
Character Range: 1875340–1878285

the enclosure.
              6.5.5.3.6. When the fuel temperature of the fuel tank reaches 20 °C a linear heat build of 15 °C begins. The fuel shall be heated in such a way that the temperature of the fuel during the heating conforms to the function below to within 1.5 °C. The elapsed time of the heat build and temperature rise is recorded.
                Tr = To + 0.2333 x t
 Where:
 Tr      =  required temperature (K),
 To      =  initial temperature (K),
 t       =  time from start of the tank heat build in minutes.

              6.5.5.3.7. As soon as break-through occurs or when the fuel temperature reaches 35 °C, whichever occurs first, the heat source is turned off, the enclosure doors unsealed and opened, and the vehicle fuel tank cap(s) removed. If break-through has not occurred by the time the fuel temperature 35 °C, the heat source is removed from the vehicle, the vehicle removed from the evaporative emission enclosure and the entire procedure outlined in paragraph 6.6.1.2. of this annex repeated until break-through occurs.
              6.5.5.4. Butane loading to breakthrough
              6.5.5.4.1. If the enclosure is used for the determination of the break-through (see paragraph 6.5.5.2.2. of this annex) the vehicle shall be placed, with the engine shut off, in the evaporative emission enclosure.
              6.5.5.4.2. The evaporative emission canister shall be prepared for the canister loading operation. The canister shall not be removed from the vehicle, unless access to it in its normal location is so restricted that loading can only reasonably be accomplished by removing the canister from the vehicle. Special care shall be taken during this step to avoid damage to the components and the integrity of the fuel system.
              6.5.5.4.3. The canister is loaded with a mixture composed of 50 per cent butane and 50 per cent nitrogen by volume at a rate of 40 grams butane per hour.
              6.5.5.4.4. As soon as the canister reaches breakthrough, the vapour source shall be shut off.
              6.5.5.4.5. The evaporative emission canister shall then be reconnected and the vehicle restored to its normal operating condition.
              6.5.6. Dynamometer test
              The test vehicle shall be pushed onto a dynamometer and shall be driven over the cycles described in paragraph 6.5.3.(a) or paragraph 6.5.3.(b) of this annex. OVC-HEVs shall be operated in charge-depleting operating condition. The engine shall be subsequently shut off. Exhaust emissions may be sampled during this operation and the results may be used for the purpose of exhaust emission and fuel consumption type approval if this operation meets the requirement described in Annex B6 or Annex B8.
              6.5.7. Hot soak evaporative emissions test
              Within 7 minutes after the dynamometer test and within 2 minutes of the engine being switched off, the hot soak evaporative emissions