ANNEX XIU.K. EC TYPE-APPROVAL OF REPLACEMENT POLLUTION CONTROL DEVICES AS SEPARATE TECHNICAL UNIT
[F1Appendix 3
Textual Amendments
F1 Substituted by Commission Regulation (EU) 2016/1718 of 20 September 2016 amending Regulation (EU) No 582/2011 with respect to emissions from heavy-duty vehicles as regards the provisions on testing by means of portable emission measurement systems (PEMS) and the procedure for the testing of the durability of replacement pollution control devices (Text with EEA relevance).
Durability procedure for evaluation of emissions performance of a replacement pollution control device U.K.
2. DESCRIPTION OF THE DURABILITY PROCEDURE U.K.
2.4. Service accumulation schedule U.K.
2.4.2. Thermal accumulation schedule U.K.
2.4.2.1. The thermal accumulation schedule shall simulate the effect of thermal ageing on the performance of a replacement pollution control device until the end of its lifetime. U.K.
2.4.2.2. The engine used for the performance of the service accumulation schedule, fitted with the exhaust after-treatment system incorporating the replacement pollution control device, is operated for a minimum of three consecutive thermal sequences, as set out in Appendix 4. U.K.
2.4.2.3. The temperatures shall be recorded over a minimum of two thermal sequences. The first sequence, conducted for warming up, shall not be taken into account for the purpose of temperature gathering. U.K.
2.4.2.4. The temperatures shall be recorded at suitable locations, chosen in accordance with points 2.2.6 to 2.2.9, at a minimum rate of once every second (1 Hz). U.K.
2.4.2.5. The effective ageing time corresponding to the thermal sequences referred to in point 2.4.2.3, shall be calculated in accordance with the following equations: U.K.
Where:
=
the effective ageing time, in hours, needed to achieve, by exposing the replacement pollution control device at the temperature T r , the same amount of ageing as the one that would result from exposure of the replacement pollution control device at the temperature T i during the second i .
=
the temperature, in K , measured in the second i , in each one of the thermal sequences.
=
thermal reactivity of the replacement pollution control device. The manufacturer shall agree with the type-approval authority on the R value to be used. It will also be possible, as alternative, to use the following default values:
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-NO x trap): 18 050
=
reference temperature, in K , being the same value as in equation 1.
=
Effective ageing time, in hours, needed to achieve, by exposing the replacement pollution control device at the temperature T r , the same amount of ageing as the one that would result from exposure of the replacement pollution control device during the duration of the thermal sequence.
=
total equivalent ageing time, in hours, needed to achieve, by exposing the replacement pollution control device at the temperature T r , 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 
=
number of temperature measurement.
=
total number of temperature measurements.
=
thermal sequence number, of those conducted for the purpose of temperature gathering, in accordance with point 2.4.2.3.
=
total number of thermal sequences conducted for the purpose of temperature gathering.
2.4.2.6. The total number of thermal sequences to be included in the service accumulation schedule shall be determined by applying the following equation: U.K.
Equation 5:
N TS = AT/AE
Where:
=
total number of thermal sequences to be carried out during the service accumulation schedule
=
total equivalent ageing time, in hours, needed to achieve, by exposing the replacement pollution control device at the temperature T r , 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 
=
Effective ageing time, in hours, needed to achieve, by exposing the replacement pollution control device at the temperature T r , the same amount of ageing as the one that would result from exposure of the replacement pollution control device during the duration of the thermal sequence.
2.4.2.7. It is allowed to reduce N TS and, consequently the service accumulation schedule, by increasing the temperatures at which each device is exposed at each mode of the ageing cycle through the application of one or several of the following measures: U.K.
insulating the exhaust pipe;
moving the replacement pollution control device closer to the exhaust manifold;
artificially heating up the temperature of the exhaust;
optimising the engine settings without substantially changing the emission behaviour of the engine.
2.4.2.8. When applying the measures referred to in points 2.4.4.6 and 2.4.4.7, the total ageing time calculated from N TS shall not be less than 10 % of the useful life listed in Table 1, e.g. the vehicle category N 1 shall not have an N TS of less than 286 thermal sequences, assuming that each sequence is 1 hour long. U.K.
2.4.2.9. It is allowed to increase N TS and, consequently, the duration of the service accumulation schedule, by lowering the temperatures at each mode of the ageing cycle through the application of one or several of the following measures: U.K.
moving the replacement pollution control device further away from the exhaust manifold;
artificially cooling down the temperature of the exhaust;
optimising the engine settings.
2.4.2.10. In the case referred to in point 2.4.1.5, the following shall apply: U.K.
N TS shall be the same for each device, so that a single service accumulation schedule can be set up.
In order to achieve the same N TS for each device, a first N TS value shall be calculated for each device, with its own AT and AE values.
If the calculated N TS values are different, one or more of the measures set out in points 2.4.2.7 to 2.4.2.10 may be applied on the device or devices for which N TS needs to be modified, over the thermal sequences referred to in point 2.4.2.3, in order to influence the measured T i and therefore conveniently speed up or slow down the artificial ageing of the targeted device or devices.
The new N TS values corresponding to the new temperatures T i obtained in point 2.4.2.10.3 shall be calculated.
The steps set out in points 2.4.2.10.3 and 2.4.2.10.4 shall be repeated until the N TS values obtained for each device in the system match.
The T r values used for obtaining the different N TS in points 2.4.2.10.4 and 2.4.2.10.5 shall be the same ones as those used in points 2.3.2 and 2.3.5 for calculating AT for each device.
2.4.2.11. In the case of an assembly of replacement pollution control devices constituting a system within the meaning of Article 3(25) of Directive 2007/46/EC, one of the following two options may be considered for the thermal ageing of the devices: U.K.
The devices within the assembly may be either separately or jointly aged, in accordance with point 2.4.2.10.
If the assembly is built in such a way that it is not possible to decouple the devices (e.g. DOC + SCR in a can), the thermal ageing of the assembly shall be carried out with the highest N TS .]