Document ID: chunk:federal_register_of_legislation:F2011C00805:reg:11:p27
Version: federal_register_of_legislation:F2011C00805
Segment Type: reg
Provision Reference: reg 11 (pt 27/45)
Character Range: 493761–496699

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.

         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 power output between 0.7 P1 and 1.15 P2.

         3. GRANTING OF A TYPE APPROVAL

         Type approval is granted subject to the following requirements:

         3.1. Exhaust emissions approval of a parent vehicle

         The parent vehicle should demonstrate its capability to adapt to any fuel composition that may occur across the market.  In the case of LPG there are variations in C3/C4 composition.  In the case of natural gas there are generally two types of fuel, high calorific fuel (H-gas) and low calorific fuel (L-gas), but with a significant spread within both ranges; they differ significantly in Wobbe index.  These variations are reflected in the reference fuels.

         3.1.1. The parent vehicle(s) shall be tested in the Type I test on the two extreme reference fuels of Annex 10a.

         3.1.1.1.  If the transition from one fuel to another is in practice aided through the use of a switch, this switch shall not be used during type approval.  In such a case on the manufacturer's request and with the agreement of the technical service the pre-conditioning cycle referred to in paragraph 5.3.1. of Annex 4 may be extended.

         3.1.2. The vehicle(s) is (are) considered to conform if, with both reference fuels, the vehicle complies with the emission limits.

         3.1.3. The ratio of emission results "r" should be determined for each pollutant as shown below:

Type(s) of fuel  Reference fuels  Calculation of "r"
LPG and petrol   Fuel A
(Approval B)                      r=                   B .
or LPB only      Fuel B           A
(Approval