Document ID: chunk:federal_register_of_legislation:F2024C00356:reg:7:p31
Version: federal_register_of_legislation:F2024C00356
Segment Type: reg
Provision Reference: reg 7 (pt 31/51)
Character Range: 621085–624214

if r < 1, no correction is needed.
               If the test fuel is reference fuel B for LPG or G25 for NG/biomethane, the emission result shall be divided by the relevant factor "r" if r < 1; if r > 1, no correction is needed.
                On the manufacturer's request, the test Type I may be performed on both reference fuels, so that no correction is needed.

              3.2.3. The vehicle shall comply with the emission limits valid for the relevant category for both measured and calculated emissions.
              3.2.4. If repeated tests are made on the same engine the results on reference fuel G20, or A, and those on reference fuel G25, or B, shall first be averaged; the "r" factor shall then be calculated from these averaged results.
              3.2.5.  During the Type I test the vehicle shall only use petrol for a maximum of 60 seconds when operating in gas mode.

              4. General conditions
              4.1. Tests for conformity of production may be performed with a commercial fuel of which the C3/C4 ratio lies between those of the reference fuels in the case of LPG, or of which the Wobbe index lies between those of the extreme reference fuels in the case of NG/biomethane. In that case a fuel analysis needs to be present.

Annex 13
  Emissions test procedure for a vehicle equipped with a periodically regenerating system
              1. Introduction
               This annex defines the specific provisions regarding type-approval of a vehicle equipped with a periodically regenerating system as defined in paragraph 2.20. of this Regulation.
              2. Scope and extension of the type approval
              2.1. Vehicle family groups equipped with periodically regenerating system
               The procedure applies to vehicles equipped with a periodically regenerating system as defined in paragraph 2.20. of this Regulation. For the purpose of this annex vehicle family groups may be established. Accordingly, those vehicle types with regenerative systems, whose parameters described below are identical, or within the stated tolerances, shall be considered to belong to the same family with respect to measurements specific to the defined periodically regenerating systems.
              2.1.1. Identical parameters are:
               Engine:
               (a) Combustion process.
               Periodically regenerating system (i.e. catalyst, particulate trap):
               (a) Construction (i.e. type of enclosure, type of precious metal, type of  substrate, cell density);
               (b) Type and working principle;
               (c) Dosage and additive system;
               (d) Volume ±10 per cent;
               (e) Location (temperature ±50 °C at 120 km/h or 5 per cent difference  of maximum temperature/pressure).
              2.2. Vehicle types of different reference masses
               The Ki factors developed by the procedures in this annex for type approval of a vehicle type with a periodically regenerating system as defined in paragraph 2.20. of this Regulation, may be extended to other vehicles in the family group with a reference