Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:16:p91
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 16 (pt 91/108)
Character Range: 1145263–1148234

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
              2.1.1. The arithmetic average emissions between regeneration events and during loading of the regenerative device shall be determined from the arithmetic mean of several approximately equidistant (if more than two) Type 1 tests. As an alternative, the manufacturer may provide data to show that the emissions remain constant (±15 per cent) on WLTCs between regeneration events. In this case, the emissions measured during the Type 1 test may be used. In any other case, emissions measurements for at least two Type 1 cycles shall be completed: one immediately after regeneration (before new loading) and one as close as possible prior to a regeneration phase. All emissions measurements shall be carried out according to this annex and all calculations shall be carried out according to paragraph 3. of this appendix.
              2.1.2. The loading process and Ki determination shall be made during the Type 1 driving cycle on a chassis dynamometer or on an engine test bench using an equivalent test cycle. These cycles may be run continuously (i.e. without the need to switch the engine off between cycles). After any number of completed cycles, the vehicle may be removed from the chassis dynamometer and the test continued at a later time.
              For Class 2 and Class 3 vehicles, at the request of the manufacturer and with the agreement of the responsible authority the Ki can be determined either with or without the Extra High phase.
              Upon request of the manufacturer and with approval of the responsible authority, a manufacturer may develop an alternative procedure and demonstrate its equivalency, including filter temperature, loading quantity and distance driven. This may be done on an engine bench or on a chassis dynamometer.
              2.1.3. The number of cycles D between two WLTCs where regeneration events occur, the number of cycles over which emission measurements are made n and the mass emissions measurement  for each compound i over each cycle j shall be recorded.
              2.2. Measurement of emissions during regeneration events
              2.2.1. Preparation of the vehicle, if required, for the emissions test during a regeneration phase, may be completed using the preconditioning cycles in paragraph 2.6. of this annex or equivalent engine test bench cycles, depending on the loading procedure chosen in paragraph 2.1.2. of this appendix.
              2.2.2. The test and vehicle conditions for the Type 1 test described in this Regulation apply before the first valid emission test is carried out.
              2.2.3. Regeneration shall not occur during the preparation of the vehicle. This may be