Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:16:p90
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 16 (pt 90/108)
Character Range: 1142530–1145554

meet the ±5 μg criterion, the sample filter shall be discarded, and the emissions test repeated. All reference filters shall be discarded and replaced within 48 hours. In all other cases, reference filters shall be replaced at least every 30 days and in such a manner that no sample filter is weighed without comparison to a reference filter that has been present in the weighing chamber (or room) for at least one day.
              2.14.3.7. If the weighing chamber (or room) stability criteria outlined in paragraph 4.2.2.1. of Annex B5 are not met, but the reference filter weighings meet the above criteria, the vehicle manufacturer has the option of accepting the sample filter weights or voiding the tests, repairing the weighing chamber (or room) control system and re-running the test.

Annex B6 - Appendix 1

Emissions test procedure for all vehicles equipped with periodically regenerating systems
              1. General
              1.1. This appendix defines the specific provisions regarding testing a vehicle equipped with periodically regenerating systems as defined in paragraph 3.8.1. of this Regulation.
              1.2. During cycles where regeneration occurs, emission standards need not apply. If a periodic regeneration occurs at least once per Type 1 test and has already occurred at least once during vehicle preparation or the distance between two successive periodic regenerations is more than 4,000 km of driving repeated Type 1 tests, it does not require a special test procedure. In this case, this appendix does not apply and a Ki factor of 1.0 shall be used.
              1.3. The provisions of this appendix shall not apply to PN emissions.
              1.4. At the request of the manufacturer, and with approval of the responsible authority, the test procedure specific to periodically regenerating systems need not apply to a regenerative device if the manufacturer provides data demonstrating that, during cycles where regeneration occurs, emissions remain below the emissions limits specified in paragraph 6.3.10. of this Regulation for the relevant vehicle category. In this case, a fixed Ki value of 1.05 shall be used for CO2 and fuel consumption.
              2. Test procedure
              The test vehicle shall be capable of inhibiting or permitting the regeneration process provided that this operation has no effect on original engine calibrations. Prevention of regeneration is only permitted during loading of the regeneration system and during the preconditioning cycles. It is not permitted during the measurement of emissions during the regeneration phase. The emission test shall be carried out with the unchanged, original equipment manufacturer's (OEM) control unit. At the request of the manufacturer and with agreement of the responsible authority, an "engineering control unit" which has no effect on original engine calibrations may be used during Ki determination.
              2.1. Exhaust emissions measurement between two WLTCs with regeneration events