Document ID: chunk:federal_register_of_legislation:F2023L00129:front:0:p27
Version: federal_register_of_legislation:F2023L00129
Segment Type: other
Provision Reference: 
Character Range: 74583–77347

the emission requirements on the reference fuels A and B as specified in Annex 5 without any readjustment to the fuelling between the two tests. One adaptation run over one WHTC hot cycle without measurement is permitted after the change of the fuel. After the adaptation run the engine shall be cooled down in accordance with paragraph 7.6.1. of Annex 4.

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

              4.7. Requirements on restricted fuel range type-approval in case of engines fuelled with natural gas/biomethane or LPG, including dual-fuel engines.

              Restricted fuel range type approval shall be granted subject to the requirements specified in paragraphs 4.7.1. to 4.7.2.3. below.

              4.7.1. Exhaust emissions type-approval of an engine running on CNG and laid out for operation on either the range of H-gases or on the range of L-gases.

              4.7.1.1. The parent engine shall be tested on the relevant reference fuel, as specified in Annex 5, 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 Regulation without any readjustment to the fuelling between the two tests. One adaptation run over one WHTC hot cycle without measurement is permitted after the change of the fuel. After the adaptation run the engine shall be cooled down in accordance with paragraph 7.6.1. of Annex 4.

              4.7.1.2. 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 (that is the lower range of GR) and 1.19 (that is 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.

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

              or,

              and,

              4.7.1.4. On delivery to the customer the engine shall bear a label as specified in paragraph 4.12.8. stating for which range of gases the engine is approved.

              4.7.2. Exhaust emissions type approval of an engine running on natural gas or LPG and designed for operation on one specific fuel composition.

              4.7.2.1.  The parent engine shall meet the emission requirements on the reference fuels GR and G25 in the case of CNG, on the reference fuels GR and G20 in the case of LNG, or on the reference fuels A and B in the case of LPG, as specified in Annex 5 to this Regulation. Fine-tuning of the fuelling system is allowed between the tests.