Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:4:p28
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 4 (pt 28/42)
Character Range: 80066–82933

is permitted after the change of the fuel. Before testing, the parent engine shall be run-in using the procedure defined in paragraph 3 of Appendix 2 to Annex III.

               4.1.5.1.                    The ratio of emission results 'r' shall be determined for each pollutant as follows:

4.2.                            Granting of a fuel range restricted EC type-approval

              Fuel range restricted EC type-approval is granted subject to the following requirements:

4.2.1.                        Exhaust emissions approval of an engine running on natural gas and laid out for operation on either the range of H-gases or on the range of L-gases

              The parent engine shall be tested on the relevant reference fuel, as specified in Annex IV, for the relevant range. The fuels are GR (fuel 1) and G23 (fuel 3) for the H-range of gases and G25 (fuel 2) and G23 (fuel 3) for the L-range of gases. The parent engine shall meet the requirements of this Directive without any readjustment to the fuelling between the two tests. However, one adaptation run over one ETC cycle without measurement is permitted after the change of the fuel. Before testing the parent engine shall be run-in using the procedure defined in paragraph 3 of Appendix 2 to Annex III.

4.2.1.1.                    At the manufacturer's request the engine may be tested on a third fuel instead of G23 (fuel 3) if the λ-shift factor (Sλ) lies between 0,89 (i.e. the lower range of GR) and 1,19 (i.e. the upper range of G25), for example when fuel 3 is a market fuel. The results of this test may be used as a basis for the evaluation of the conformity of the production.

               4.2.1.2.                    The ratio of emission results 'r' shall be determined for each pollutant as follows:
              or,

              and,

4.2.1.3.                    On delivery to the customer the engine shall bear a label (see paragraph 5.1.5) stating for which range of gases the engine is approved.

4.2.2.                        Exhaust emissions approval of an engine running on natural gas or LPG and laid out for operation on one specific fuel composition
4.2.2.1.                    The parent engine shall meet the emission requirements on the reference fuels GR and G25 in the case of natural gas, or the reference fuels A and B in the case of LPG, as specified in Annex IV. Between the tests fine-tuning of the fuelling system is allowed. This fine-tuning will consist of a recalibration of the fuelling database, without any alteration to either the basic control strategy or the basic structure of the database.  If necessary the exchange of parts that are directly related to the amount of fuel flow (such as injector nozzles) is allowed.

4.2.2.2.                    At the manufacturer's request the engine may be tested on the reference fuels GR and G23,