Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p132
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 132/150)
Character Range: 1091145–1094230

used to establish robustness to mechanical shock and the results of that test.
4.3. Requirements regarding emissions
4.3.1. Outline of procedure for evaluation of emissions
The engines indicated in paragraph 3.4.4. (a) of this Regulation equipped with a complete emissions control system including the replacement pollution control device of the type for which approval is requested, shall be subjected to tests appropriate for the intended application as described in Annex 4, in order to compare its performance with the original emissions control system according to the procedure described below.
4.3.1.1. Where the replacement pollution control device does not comprise the complete emissions control system, only new original equipment or new original replacement pollution control components shall be used to provide a complete system.
4.3.1.2. The emissions control system shall be aged according to the procedure described in paragraph 4.3.2.4. and retested to establish the durability of its emissions performance.
The durability of a replacement pollution control device is determined from a comparison of the 2 successive sets of exhaust gas emissions tests.
                  (a) The first set is that made with the replacement pollution control device which has been run in with 12 WHSC cycles;
                  (b) The second set is that made with the replacement pollution control device which has been aged by the procedures detailed below.
Where approval is applied for different types of engines from the same engine manufacturer, and provided that these different types of engines are fitted with an identical original equipment pollution control system, the testing may be limited to at least two engines selected after agreement with the Type Approval Authority.
4.3.2. Procedure for evaluation of emissions performance of a replacement pollution control device
4.3.2.1. The engine or engines shall be fitted with a new original equipment pollution control device according to paragraph 4.11.4. of this Regulation.
The exhaust after-treatment system shall be preconditioned with 12 WHSC cycles. After this preconditioning, the engines shall be tested according to the WHDC test procedures specified in Annex 4. Three exhaust gas tests of each appropriate type shall be performed.
The test engines with the original exhaust after-treatment system or original replacement exhaust after-treatment system shall comply with the limit values according to the type approval of the engine or vehicle.
4.3.2.2. Exhaust gas test with replacement pollution control device
The replacement pollution control device to be evaluated shall be fitted to the exhaust after-treatment system tested according to the requirements of paragraph 4.3.2.1., replacing the relevant original equipment exhaust after-treatment device.
The exhaust after-treatment system incorporating the replacement pollution control device shall then be preconditioned with 12 WHSC cycles. After this preconditioning, the engines shall be tested according to the WHDC procedures described in Annex 4. Three