Document ID: chunk:federal_register_of_legislation:F2022C00213:reg:120:p29
Version: federal_register_of_legislation:F2022C00213
Segment Type: reg
Provision Reference: reg 120 (pt 29/30)
Character Range: 438047–441099

j ≤ d;
            nk  = number of test points of event k at which emissions measurements  (Type I operating cycles or equivalent engine test bench cycles)               are made between two cycles where regenerative phases occur, ;
            dk  =  number of operating cycles of event k required for regeneration;
            Dk  = number of operating cycles of event k between two cycles where  regenerative phases occur.
       For an illustration of measurement parameters see Figure 10/2 (below)

Figures 10/2 and 10/3

Parameters measured during emissions test during and between cycles where regeneration occurs (schematic example)

For more details of the schematic process see Figure 10/3

For application of a simple and realistic case, the following description gives a detailed explanation of the schematic example shown in Figure 10/3 above):
       1. DPF: regenerative, equidistant events, similar emissions (±15 per cent) from event to event
        Dk = Dk+1  = D1
        dk  = dk+1   = d1
        Mrik – Msik = Mrik+1 – Msik+1
        nk  =  n
       2. DeNOx: the desulphurisation (SO2 removal) event is initiated before an influence of sulphur on emissions is detectable (±15 per cent of measured emissions) and in this example for exothermic reason together with the last DPF regeneration event performed.
       M'sik,j=1 = constant  Msik = Msik+1 = Msi2
            Mrik = Mrik+1 = Mri2
       For SO2 removal event:
       Mri2, Msi2, d2, D2, n2 = 1
       3. Complete system (DPF + DeNOx):

        The calculation of the factor (Ki) for multiple periodic regenerating systems is only possible after a certain number of regeneration phases for each system.  After performing the complete procedure (A to B, see Figure 10/2), the original starting conditions A should be reached again.
       3.4.1. Extension of approval for a multiple periodic regeneration system
       3.4.1.1. If the technical parameter(s) and or the regeneration strategy of a multiple regeneration system for all events within this combined system are changed, the complete procedure including all regenerative devices should be performed by measurements to update the multiple Ki factor.
       3.4.1.2. If a single device of the multiple regeneration system changed only in strategy parameters (i.e. such as "D" and/or "d" for DPF) and the manufacturer could present technical feasible data and information to the Technical Service that:
           (a) There is no detectable interaction with the other device(s) of the system, and
           (b) The important parameters (i.e. construction, working principle, volume, location etc.) are identical,
           the necessary update procedure for Ki could be simplified.
        As agreed between the manufacturer and the Technical Service in such a case only a single event of sampling/storage and regeneration should be performed and the test results ("Msi", "Mri") in combination with the changed parameters ("D" and/or "d") could be introduced in the relevant formula(s) to update the multiple