Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:110:p14
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 110 (pt 14/59)
Character Range: 641235–644578

applicable emission limits, as given in the tables in section 6.2.1 of Annex I to Directive 2005/55/EC, over the durability period applicable to the vehicle in which the engine is installed.

              This Annex also details the emission and non-emission-related maintenance that will be carried out on engines undergoing a service accumula- tion schedule. Such maintenance will be performed on in-service engines and communicated to owners of new heavy-duty engines.

         2.        SELECTION OF ENGINES FOR ESTABLISHING USEFUL LIFE DETERIORATION FACTORS

             2.1. Engines will be selected from the engine family defined in section 8.1 of Annex I to Directive 2005/55/EC for emission testing to establish useful life deterioration factors.

             2.2. Engines from different engine families may be further combined into families based on the type of exhaust aftertreatment system utilised. In order to place engines with different numbers of cylinders and different cylinder configuration but having the same technical specifications and instal- lation for the exhaust aftertreatment systems into the same engine-aftertreatment system family, the manufacturer shall provide data to the approval authority that demonstrates that the emissions of such engines are similar.

             2.3. One engine representing the engine-aftertreatment system family shall be selected by the engine manufacturer for testing over the service accumulation schedule defined in section 3.2 of this Annex, according to the criteria for selecting engines given in section 8.2 of Annex I to Directive 2005/55/EC and shall be reported to the type-approval authority before any testing commences.

             2.3.1. If the type-approval authority decides that the worst case emission rate of the engine-aftertreatment system family can be characterised better by another engine then the test engine shall be selected jointly by the type-approval authority and the engine manufacturer.

         3.        ESTABLISHING USEFUL LIFE DETERIORATION FACTORS

             3.1. General

              Deterioration factors applicable to an engine-aftertreatment system family are developed from the selected engines based on a distance and ser- vice accumulation procedure that includes periodic testing for gaseous and particulate emissions over the ESC and ETC tests.

             3.2. Service accumulation schedule

              Service accumulation schedules may be carried out at the choice of the manufacturer by running a vehicle equipped with the selected parent engine over an "in-service accumulation" schedule or by running the selected parent engine over a "dynamometer service accumulation" schedule.

             3.2.1. In-service and dynamometer service accumulation

             3.2.1.1. The manufacturer shall determine the form and extent of the distance and service accumulation for engines, consistent with good engineering practice.

             3.2.1.2. The manufacturer will determine when the engine will be tested for gaseous and particulate emissions over the ESC and ETC tests.

             3.2.1.3. A single engine-operating schedule shall be used for all engines in an engine-aftertreatment system family.

             3.2.1.4. At the request of the manufacturer and with the agreement of the type-approval