Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p141
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 141/150)
Character Range: 1117611–1120760

temperatures recorded pursuant to paragraphs 2.2. to 2.2.15. shall be reduced to a reference temperature Tr, requested by the manufacturer in agreement with the Type Approval Authority, within the range of the temperatures recorded during the data collection phase.

              2.3.2. In the case specified in paragraph 2.2.13., the value of Tr for each one of the devices may vary.

              2.3.3. The equivalent ageing time corresponding to the reference temperature shall be calculated, for each bin referred to in 2.2.11., in accordance with the following equation:

Equation 1:
               Where:

              R = thermal reactivity of the replacement pollution control device.

              The following values shall be used:

              Diesel Oxidation Catalyst (DOC): 18,050

              Catalysed DPF: 18,050

              SCR or ammonia oxidation catalyst (AMOX) based on iron-zeolite
              (Fe-Z): 5,175

              SCR copper-zeolite (Cu-Z): 11,550

              SCR Vanadium (V): 5,175

              LNT (lean-NOx trap): 18,050

              Tr = reference temperature, in K.

               = midpoint temperature, in K, of the temperature bin i to which the replacement pollution control device is exposed during the data collection phase, registered in the temperature histogram.

               = the time, in hours, corresponding to the temperature, adjusted to a full useful life basis e.g. if the histogram represented 5 hours, and useful life is 4,000 hours according to Table 1, all histogram time entries would be multiplied by (4,000/5)=800.

              = the equivalent ageing time, in hours, needed to achieve, by exposing the replacement pollution control device at the temperature Tr, the same amount of ageing as the one that would result from exposure of the replacement pollution control device at the temperature during the time

              i = bin number, where 1 is number for the bin with the lowest temperature and n the value for the bin with the highest temperature.

              Equation 2:

              AT = total equivalent ageing time, in hours, needed to achieve, by exposing the replacement pollution control device at the temperature Tr, the same amount of ageing as the one that would result from exposure of the replacement pollution control device, over its useful life, to the temperature  during the time  of each one of the i bins registered in the histogram.

              = the equivalent ageing time, in hours, needed to achieve, by exposing the replacement pollution control device at the temperature Tr, the same amount of ageing as the one that would result from exposure of the replacement pollution control device at the temperature  during the time .

              i = bin number, where 1 is number for the bin with the lowest temperature and n the value for the bin with the highest temperature.

              n = total number of temperature bins.

              2.3.5.  In the case referred to in paragraph 2.2.13., AT shall be calculated for each device.

              2.4. Service accumulation schedule

              2.4.1. General