Document ID: chunk:federal_register_of_legislation:F2024L00443:reg:3:p4
Version: federal_register_of_legislation:F2024L00443
Segment Type: reg
Provision Reference: reg 3 (pt 4/13)
Character Range: 220977–223823

with the specifications given in paragraph 2. of Annex 10 to this Regulation.
              3.5. The road load coefficients to be used shall be those for vehicle low (VL). If VL does not exist then the vehicle high (VH) road load shall be used. In that case VH shall be defined in accordance with point 4.2.1.1.1. of Annex B4 to UN Regulation No. 154. In case the interpolation method is used VL and VH shall be specified in accordance with point 4.2.1.1.2. of Annex B4 to UN Regulation No. 154. The dynamometer shall be adjusted to simulate the operation of a vehicle on the road at – 7 °C. Such adjustment may be based on a determination of the road load force profile at – 7 °C. Alternatively, the driving resistance determined may be adjusted for a 10 per cent decrease of the coast-down time. The Technical service may approve the use of other methods for determining the driving resistance.
              4. Vehicle preconditioning
              4.1. Summary
              4.1.1. To ensure reproducible emission tests, the test vehicles shall be conditioned in a uniform manner. The conditioning consists of a preparatory drive on a chassis dynamometer followed by a soak period before the emission test according to paragraph 4.3. of this annex.
              4.2. Preconditioning
              4.2.1. The fuel tank(s) shall be filled with the specified test fuel. If the existing fuel in the fuel tank(s) does not meet the specifications contained in paragraph 3.4.1. of this annex, the existing fuel shall be drained prior to the fuel fill. The test fuel shall be at a temperature less than or equal to 289 K (+16 °C). For the above operations the evaporative emission control system shall neither be abnormally purged nor abnormally loaded.
              4.2.2. The vehicle is moved to the test cell and placed on the chassis dynamometer.
              4.2.3. The preconditioning consists of one complete driving cycle, Parts One and Two, according to Tables A4a/1 and A4a/2 and Figure A4a/1 of Annex 4a to the 07 series of amendments to this Regulation. At the request of the manufacturer, vehicles with a positive ignition engine may be preconditioned with one Part One and two Part Two driving cycles.
              4.2.4. During the preconditioning the test cell temperature shall remain relatively constant and not be higher than 303 K (30 °C)
              4.2.5. The drive-wheel tyre pressure shall be set in accordance with the provisions of paragraph 6.2.3. of Annex 4a to the 07 series of amendments to this Regulation.
              4.2.6. Within ten minutes of completion of the preconditioning, the engine shall be switched off.
              4.2.7. If requested by the manufacturer and approved by the Technical service, additional preconditioning may in exceptional cases be allowed. The Technical service may also choose