Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p134
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 134/150)
Character Range: 1096701–1099774

the results for each regulated pollutant (CO, HC, NMHC, methane, NOx, NH3, particulate mass and particle number as appropriate for the type approval of the engine) meet the following condition:
M*AF ≤ G
Where:
M: mean value of the emissions of one pollutant obtained from the three tests with the preconditioned replacement pollution control device before ageing (i.e. results from paragraph 4.3.2.);
AF: the ageing factor for one pollutant;
                  G: limit value of the emissions of one pollutant according to the type approval of the vehicle(s).
4.3.3. Replacement pollution control device technology family
The manufacturer may identify a replacement pollution control device technology family, to be identified by basic characteristics which shall be common to devices within the family.
To belong to the same replacement pollution control device technology family the replacement pollution control devices shall have the following:
                  (a) The same emissions control mechanism (oxidation catalyst, three-way catalyst, particulate filter, selective catalytic reduction for NOx etc.);
                  (b) The same substrate material (same type of ceramic, or same type of metal);
(c) The same substrate type and cell density;
                  (d) The same catalytically active materials and, where more than one, the same ratio of catalytically active materials;
(e) The same total charge of catalytically active materials;
(f) The same type of washcoat applied by the same process.
4.3.4. Assessment of the durability of emissions performance of a replacement pollution control device by use of a technology family ageing factor.
Where the manufacturer has identified a replacement pollution control technology family, the procedures described in paragraph 4.3.2. may be used to determine the ageing factors for each pollutant for the parent of that family. The engine on which these tests are conducted shall have a minimum engine displacement of 0.75 dm³ per cylinder.
4.3.4.1. Determination of durability performance of family members
A replacement pollution control device A within a family and intended to be mounted on an engine of displacement CA may be considered to have the same ageing factors as the parent replacement pollution control device P, determined on an engine of displacement CP, if the following conditions are fulfilled:
VA/CA ≥ VP/CP
Where:
VA:  Substrate volume (in dm³) of replacement pollution control device A
                  VP:  Substrate volume (in dm³) of the parent replacement pollution control device P of the same family
and
both engines use the same method for regeneration of any emissions control devices incorporated in the original exhaust after-treatment system. This requirement shall apply only where devices requiring regeneration are incorporated in the original exhaust after-treatment system.
If these conditions are fulfilled, the emissions durability performance of other members of the family may be determined from the emissions results (S) of that family member determined according to