Document ID: chunk:federal_register_of_legislation:F2012C00283:reg:7:p29
Version: federal_register_of_legislation:F2012C00283
Segment Type: reg
Provision Reference: reg 7 (pt 29/51)
Character Range: 586194–589203

there is on the market a large variation in fuel composition, requiring the fuelling system to adapt its fuelling rates to these compositions. To demonstrate this capability, the vehicle has to be tested in the test Type I on two extreme reference fuels and demonstrate the self-adaptability of the fuelling system. Whenever the self adaptability of a fuelling system has been demonstrated on a vehicle, such a vehicle may be considered as a parent of a family. Vehicles that comply with the requirements of members of that family, if fitted with the same fuelling system, need to be tested on only one fuel.
              2. Definitions
               For the purpose of this annex the following definitions shall apply:
              2.1.  A "family" means a group of vehicle types fuelled by LPG, NG/biomethane identified by a parent vehicle.

               A "parent vehicle" means a vehicle that is selected to act as the vehicle on which the self-adaptability of a fuelling system is going to be demonstrated, and to which the members of a family refer. It is possible to have more than one parent vehicle in a family.
              2.2. Member of the family
              2.2.1. A "member of the family" is a vehicle that shares the following essential characteristics with its parent(s):
               (a) It is produced by the same manufacturer;
               (b) It is subject to the same emission limits;
               (c) If the gas fuelling system has a central metering for the whole engine:
                   It has a certified power output between 0.7 and 1.15 times that of the parent vehicle.
                   If the gas fuelling system has an individual metering per cylinder:
                   It has a certified power output per cylinder between 0.7 and 1.15 times that of the parent vehicle.
               (d) If fitted with a catalyst, it has the same type of catalyst i.e. three way,  oxidation, de-NOx.
               (e) It has a gas fuelling system (including the pressure regulator) from the  same system manufacturer and of the same type: induction, vapour               injection (single point, multipoint), liquid injection (single point,               multipoint).

               (f) This gas fuelling system is controlled by an ECU of the same type and  technical specification, containing the same software principles and               control strategy. The vehicle may have a second ECU compared to the               parent vehicle, provided that the ECU is only used to control the               injectors, additional shut-off valves and the data acquisition from               additional sensors.

              2.2.2. With regard to requirement (c): in the case where a demonstration shows two gas-fuelled vehicles could be members of the same family with the exception of their certified power output, respectively P1 and P2 (P1 < P2), and both are tested as if were parent vehicles the family relation will be considered valid for any vehicle with a certified