Document ID: chunk:federal_register_of_legislation:F2024C00356:reg:12:p9
Version: federal_register_of_legislation:F2024C00356
Segment Type: reg
Provision Reference: reg 12 (pt 9/10)
Character Range: 472583–475996

at least 20 minutes of bench ageing. The measured catalyst temperature results shall be tabulated into a histogram with temperature groups of no larger than 10 °C.
               (b) The BAT equation shall be used to calculate the effective reference  temperature by iterative changes to the reference temperature (Tr)               until the calculated ageing time equals or exceeds the actual time               represented in the catalyst temperature histogram. The resulting               temperature is the effective reference temperature on the SBC for that               catalyst system and ageing bench.
              2.3.1.6. Catalyst Ageing Bench. The catalyst ageing bench shall follow the SBC and deliver the appropriate exhaust flow, exhaust constituents, and exhaust temperature at the face of the catalyst.
               All bench ageing equipment and procedures shall record appropriate information (such as measured A/F ratios and time-at-temperature in the catalyst) to assure that sufficient ageing has actually occurred.
              2.3.1.7. Required Testing. For calculating deterioration factors at least two Type I Tests before bench ageing of the emission control hardware and at least two Type I Tests after the bench-aged emission hardware is reinstalled have to be performed on the test vehicle.
               Additional testing may be conducted by the manufacturer. Calculation of the deterioration factors has to be done according to the calculation method as specified in paragraph 7 of this annex.
              2.3.2. Vehicles with Compression Ignition Engines

              2.3.2.1. The following bench ageing procedure is applicable for compression-ignition vehicles including hybrid vehicles.
               The bench ageing procedure requires the installation of the after-treatment system on a after-treatment system ageing bench.
               Ageing on the bench is conducted by following the standard diesel bench cycle (SDBC) for the number of regenerations/desulphurisation's calculated from the bench ageing duration (BAD) equation.
              2.3.2.2. Standard Diesel Bench Cycle (SDBC). Standard bench ageing is conducted following the SDBC. The SDBC shall be run for the period of time calculated from the bench ageing duration (BAD) equation. The SDBC is described in Appendix 2 of this annex.
              2.3.2.3. Regeneration data. Regeneration intervals shall be measured during at least 10 full cycles of the SRC cycle as described in Appendix 3. As an alternative the intervals from the Ki determination may be used.
                If applicable, desulphurisation intervals shall also be considered based on manufacturer's data.
              2.3.2.4. Diesel bench-ageing duration. Bench ageing duration is calculated using the BAD equation as follows:
                Bench-Ageing Duration = number of regeneration and/or desulphurisation cycles (whichever is the longer) equivalent to 160,000 km of driving.
              2.3.2.5. Ageing Bench. The ageing bench shall follow the SDBC and deliver appropriate exhaust flow, exhaust constituents, and exhaust temperature to the after-treatment system inlet.
                The manufacturer shall record the number of regenerations/desulphurisations (if applicable) to assure that sufficient ageing has actually occurred.
              2.3.2.6. Required Testing. For calculating deterioration factors