Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:10:p6
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 10 (pt 6/30)
Character Range: 536851–539774

an exhaust aftertreatment based on a periodic regeneration process, the emissions shall be measured on at least two ETC tests, one during and one outside a regeneration event on a stabilised aftertreatment system, and the results be weighted.

        The regeneration process shall occur at least once during the ETC test. The engine may be equipped with a switch capable of preventing or permitting the regeneration process provided this operation has no effect on the original engine calibration.

        The manufacturer shall declare the normal parameter conditions under which the regeneration process occurs (soot load, temperature, exhaust back-pressure etc) and its duration time (n2). The manufacturer shall also provide all the data to determine the time between two regenerations (n1). The exact procedure to determine this time shall be agreed by the Technical Service based upon good engineering judgement.

        The manufacturer shall provide an aftertreatment system that has been loaded in order to achieve regeneration during an ETC test. Regen- eration shall not occur during this engine conditioning phase.

        Average emissions between regeneration phases shall be determined from the arithmetic mean of several approximately equidistant ETC tests. It is recommended to run at least one ETC as close as possible prior to a regeneration test and one ETC immediately after a regen- eration test. As an alternative, the manufacturer may provide data to show that the emissions remain constant (± 15 %) between regen- eration phases. In this case, the emissions of only one ETC test may be used.

        During the regeneration test, all the data needed to detect regeneration shall be recorded (CO or NOx emissions, temperature before and after the aftertreatment system, exhaust back pressure etc).

        During the regeneration process, the emission limits in table 2 of Annex I can be exceeded.

        The measured emissions shall be weighted according to section 5.5 and 6.3 of Appendix 2 to this Annex and the final result shall not exceed the limits in table 2 of Annex I.'

  (e)      Appendix 1 is amended as follows:

       (i)      Section 2.1 is replaced by the following:

        '2.1. Preparation of the Sampling Filter

              At least one hour before the test, each filter shall be placed in a partially covered petri dish which is protected against dust contami- nation, and placed in a weighing chamber for stabilisation. At the end of the stabilisation period each filter shall be weighed and the tare weight shall be recorded. The filter shall then be stored in a closed petri dish or sealed filter holder until needed for testing. The filter shall be used within eight hours of its removal from the weighing chamber. The tare weight shall be recorded.'

       (ii)     Section 2.7.4. is replaced by the following: '2.7.4. Particulate Sampling
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