Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:99:p36
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 99 (pt 36/39)
Character Range: 1255844–1259166

shall apply:

                - For the calculation of the THC emissions, the ugas value of the gaseous fuel shall be used.

                - For the calculation of the NMHC emissions, the ugas value on the basis of CH2.93 shall be used.

                - For the calculation of the CH4 emissions, the ugas value of CH4 shall be used.

              A.6.3. Operation in diesel mode

              For Type 1B, 2B or 3B dual-fuel engines operating in diesel mode, the molar component ratios and the ugas values of diesel fuel shall be used.

              A.6.4. Determination of the molar component ratios when the fuel mix is known

              A.6.4.1. Calculation of the fuel mixture components

                   (A6.1)

                   (A6.2)

                  (A6.3)

                   (A6.4)

                   (A6.5)

              where:

              qmf1  fuel mass flow rate of fuel1, kg/s

              qmf2  fuel mass flow rate of fuel2, kg/s

              wALF  hydrogen content of fuel, per cent mass

              wBET  carbon content of fuel, per cent mass

              wGAM  sulphur content of fuel, per cent mass

              wDEL  nitrogen content of fuel, per cent mass

              wEPS  oxygen content of fuel, per cent mass

              A.6.4.2. Calculation of the molar ratios of H, C, S, N and O related to C for the fuel mixture (according to ISO8178-1, Annex A-A.2.2.2).

                     (A6.6)

                     (A6.7)

                     (A6.8)

                      (A6.9)

              where:

              wALF  hydrogen content of fuel, per cent mass

              wBET  carbon content of fuel, per cent mass

              wGAM  sulphur content of fuel, per cent mass

              wDEL  nitrogen content of fuel, per cent mass

              wEPS  oxygen content of fuel, per cent mass

              α  molar hydrogen ratio (H/C)

              γ  molar sulphur ratio (S/C)

              δ  molar nitrogen ratio (N/C)

              ε  molar oxygen ratio (O/C)

              referring to a fuel CHαONS

              A.6.4.3. Calculation of the ugas values for a fuel mixture

              The raw exhaust gas ugas values for a fuel mixture can be calculated with the exact equations in paragraph 8.4.2.4. of Annex 4 and the molar ratios calculated according to paragraph A.6.4.2.

              For systems with constant mass flow, equation 57 in paragraph 8.5.2.3.1. of Annex 4 is needed to calculate the diluted exhaust gas ugas values.

[*]The category code may also be in the format L1, L2, L3 etc
[**]See clauses 3.1 to 3.2.
[1] MA category vehicles with a gross vehicle mass over 3,500kg
[2] MB category vehicles with a gross vehicle mass over 3,500kg
[3] MC category vehcles with a gross vehicle mass over 3,500kg
 [4] As defined in the Consolidated Resolution on the Construction of Vehicles (R.E.3.), document ECE/TRANS/WP.29/78/Rev.2, para. 2. - www.unece.org/trans/main/wp29/wp29wgs/wp29gen/wp29resolutions.html.
[5] For example in case of an empty gas tank
 [6] This paragraph is reserved for alternative provisions relating to alternative light-duty OBD and NOx control requirements.
[7] This would typically be the case of a liquefied bio-methane
 [8] Ageing procedure in Annex 13 needs to be finalised before type approvals