Document ID: chunk:federal_register_of_legislation:F2008C00323:reg:11:p26
Version: federal_register_of_legislation:F2008C00323
Segment Type: reg
Provision Reference: reg 11 (pt 26/45)
Character Range: 493623–496629

design parameters which shall be common to vehicles within the family. In some cases there may be interaction of parameters. These effects shall also be taken into consideration to ensure that only vehicles with similar exhaust emission characteristics are included within an OBD family.

         2.  To this end, those vehicle types whose parameters described below are identical are considered to belong to the same engine/emission control/OBD system combination.

         Engine:

            (a) combustion process (i.e. positive-ignition, compression-ignition, two-stroke, four-stroke),

            (b) method of engine fuelling (i.e. carburettor or fuel injection).

         Emission control system:

            (a) type of catalytic converter (i.e. oxidation, three-way, heated catalyst, other),

            (b) type of particulate trap,

            (c) secondary air injection (i.e. with or without),

            (d) exhaust gas recirculation (i.e. with or without)

         OBD parts and functioning.

            the methods of OBD functional monitoring, malfunction detection and malfunction indication to the vehicle driver.

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Annex 12

GRANTING OF AN ECE TYPE APPROVAL FOR A VEHICLE FUELLED
BY LPG OR NATURAL GAS (NG)

         1. INTRODUCTION

         This Annex describes the special requirements that apply in the case of an approval of a vehicle that runs on LPG or natural gas (NG), or that can run either on unleaded or LPG or natural gas, in so far as the testing on LPG or natural gas is concerned.

         In the case of LPG and natural gas 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 Type I test 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:

         2.1.  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