1.Parameters defining the engine CO2-family
The engine CO2-family, as determined by the manufacturer, shall comply with the membership criteria defined in accordance with paragraph 5.2.3. of Annex 4 to UN/ECE Regulation 49 Rev.06. An engine CO2-family may consist of only one engine.
In addition to those membership criteria, the engine CO2-family, as determined by the manufacturer, shall comply with the membership criteria listed in paragraph 1.1 to 1.9 of this Appendix.
In addition to the parameters listed below, the manufacturer may introduce additional criteria allowing the definition of families of more restricted size. These parameters are not necessarily parameters that have an influence on the level of fuel consumption.
1.1.Combustion relevant geometric data
1.1.1.Displacement per cylinder
1.1.2.Number of cylinders
1.1.3.Bore and stroke data
1.1.4.Combustion chamber geometry and compression ratio
1.1.5.Valve diameters and port geometry
1.1.6.Fuel injectors (design and position)
1.1.7.Cylinder head design
1.1.8.Piston and piston ring design
1.2.Air management relevant components
1.2.1.Pressure charging equipment type (waste gate, VTG, 2-stage, other) and thermodynamic characteristics
1.2.2.Charge air cooling concept
1.2.3.Valve timing concept (fixed, partly flexible, flexible)
1.2.4.EGR concept (uncooled/cooled, high/low pressure, EGR-control)
1.3.Injection system
1.4.Auxiliary/equipment propulsion concept (mechanically, electrically, other)
1.5.Waste heat recovery (yes/no; concept and system)
1.6.Aftertreatment system
1.6.1.Reagent dosing system characteristics (reagent and dosing concept)
1.6.2.Catalyst and DPF (arrangement, material and coating)
1.6.3.HC dosing system characteristics (design and dosing concept)
1.7.Full load curve
1.7.1.The torque values at each engine speed of the full load curve of the CO2-parent engine determined in accordance with paragraph 4.3.1. shall be equal or higher than for all other engine within the same CO2-family at the same engine speed over the whole engine speed range recorded.
1.7.2.The torque values at each engine speed of the full load curve of the engine with the lowest power rating of all engines within the engine CO2-family determined in accordance with paragraph 4.3.1. shall be equal or lower than for all other engines within the same CO2-family at the same engine speed over the whole engine speed range recorded.
1.8.Characteristic engine test speeds
1.8.1.The engine idle speed, nidle, of the CO2-parent engine as declared by the manufacturer at the application for certification in the information document in accordance with Appendix 2 to this Annex shall be equal or lower than for all other engines within the same CO2-family.
1.8.2.The engine speed n95h of all other engines than the CO2-parent engine within the same CO2-family, determined from the engine full load curve recorded in accordance with paragraph 4.3.1 by applying the definitions of characteristic engine speeds in accordance with paragraph 7.4.6. of Annex 4 to UN/ECE Regulation 49 Rev.06, shall not deviate from the engine speed n95h of the CO2-parent engine by more than ± 3 percent.
1.8.3.The engine speed n57 of all other engines than the CO2-parent engine within the same CO2-family, determined from the engine full load curve recorded in accordance with paragraph 4.3.1 by applying the definitions in accordance with paragraph 4.3.5.2.1, shall not deviate from the engine speed n57 of the CO2-parent engine by more than ± 3 percent.
1.9.Minimum number of points in the fuel consumption map
1.9.1.All engines within the same CO2-family shall have a minimum number of 54 mapping points of the fuel consumption map located below their respective engine full load curve determined in accordance with paragraph 4.3.1.
