Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:23:p6
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 23 (pt 6/15)
Character Range: 1913174–1916415

on the SBC. The effective reference temperature of the SBC shall be determined for the actual catalyst system design and actual ageing bench which will be used using the following procedures:
                  (a) Measure time-at-temperature data in the catalyst system on the catalyst ageing bench following the SBC. Catalyst temperature shall be measured at the highest temperature location of the hottest catalyst in the system. Alternatively, the temperature may be measured at another location providing that it is adjusted to represent the temperature measured at the hottest location.

                    Catalyst temperature shall be measured at a minimum rate of one hertz (one measurement per second) during 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 shall record appropriate information (such as measured A/F ratios and time-at-temperature in the catalyst) to assure that the bench-ageing test is documented to demonstrate that sufficient ageing has actually occurred.

              2.3.1.7. Required testing. For calculating deterioration factors at least two Type 1 tests before bench ageing of the emission control hardware and at least two Type 1 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 an after-treatment system ageing bench.

              In case of exhaust after-treatment system using reagent, the whole injection system shall be fitted and working for ageing.

               Ageing on the bench is conducted by following the Standard Diesel Bench Cycle (SDBC) for the number of regenerations/desulphurisations calculated from the Bench Ageing Duration (BAD) equation.

              2.3.2.2. SDBC. Standard bench ageing is conducted following the SDBC. The SDBC shall be run for the period of time calculated from the BAD equation. The SDBC is described in Appendix 2 to this annex.

              2.3.2.3. Regeneration data. Regeneration intervals shall be measured during