Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:99:p11
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 99 (pt 11/39)
Character Range: 1183664–1186367

energy ratio calculated over a specific operating sequence.

              2.3. "Heavy-Duty Dual-Fuel (HDDF) Type 1A engine" means a dual-fuel engine that operates over the hot part of the WHTC test-cycle with an average gas ratio that is not lower than 90 per cent (GERWHTC ≥ 90 %), and that does not idle using exclusively diesel fuel, and that has no diesel mode.

              2.4. "Heavy-Duty Dual-Fuel (HDDF) Type 1B engine" means a Dual-Fuel engine that operates over the hot part of the WHTC test-cycle with an average gas ratio that is not lower than 90 per cent (GERWHTC ≥ 90 %), and that does not idle using exclusively diesel fuel in dual-fuel mode, and that has a diesel mode.

              2.5. "Heavy-Duty Dual-Fuel (HDDF) Type 2A engine" means a Dual-Fuel engine that operates over the hot part of the WHTC test-cycle with an average gas ratio between 10 per cent and 90 per cent (10 % < GERWHTC < 90 %) and that has no diesel mode or that operates over the hot part of the WHTC test-cycle with an average gas ratio that is not lower than 90 per cent (GERWHTC ≥ 90 %), but that idles using exclusively diesel fuel, and that has no diesel mode.

              2.6. "Heavy-Duty Dual-Fuel (HDDF) Type 2B engine" means a Dual-Fuel engine that operates over the hot part of the WHTC test-cycle with an average gas ratio between 10 per cent and 90 per cent (10 % < GERWHTC < 90 %) and that has a diesel mode or that operates over the hot part of the WHTC test-cycle with an average gas ratio that is not lower than 90 per cent (GERWHTC ≥ 90 %), but that can idle using exclusively diesel fuel in dual-fuel mode, and that has a diesel mode.

              2.7. "Heavy-Duty Dual-Fuel (HDDF) Type 3B engine"[2] means a dual-fuel engine that operates over the hot part of the WHTC test-cycle with an average gas ratio that does not exceed 10 per cent (GERWHTC ≤ 10 %) and that has a diesel mode.

              3.  Dual-fuel specific additional approval requirements

              3.1.  Dual-fuel-engine family

              3.1.1.  Criteria for belonging to a dual-fuel engine family

              All engines within a dual-fuel engine family shall belong to the same type of dual-fuel engines defined in section 23, and operate with the same types of fuel or when appropriate with fuels declared according to this Regulation as being of the same range(s).

              All engines within a dual-fuel engine family shall meet the criteria defined by this Regulation for belonging to a compression ignition engine family.

              The difference between the highest and the lowest GERWHTC ( i.e. the highest GERWHTC minus the lowest GERWHTC) within a dual-fuel engine family shall not