Document ID: chunk:federal_register_of_legislation:F2008C00323:reg:11:p29
Version: federal_register_of_legislation:F2008C00323
Segment Type: reg
Provision Reference: reg 11 (pt 29/45)
Character Range: 501645–504757

be established.  Accordingly, those vehicle types with regenerative systems, whose parameters described below are identical, or within the stated tolerances, shall be considered to belong to the same family with respect to measurements specific to the defined periodically regenerating systems.

         2.1.1. Identical parameters are:

         Engine:

         (a) combustion process

         Periodically regenerating system (i.e. catalyst, particulate trap):

             (a) construction (i.e. type of enclosure, type of precious metal, type of substrate, cell density),
         (b) type and working principle,
         (c) dosage and additive system,
         (d) volume ±10 per cent,
             (e) location (temperature ±50 °C at 120 km/h or 5 per cent difference of max. temperature / pressure).

         2.2. Vehicle types of different reference masses

         The Ki factors developed by the procedures in this Annex  for type approval of a vehicle type with a periodically regenerating system as defined in paragraph 2.20. of this Regulation, may be extended to other vehicles in the family group with a reference mass within the next two higher equivalent inertia classes or any lower equivalent inertia.

         3. TEST PROCEDURE

         The vehicle may be equipped with a switch capable of preventing or permitting the regeneration process provided that this operation has no effect on original engine calibration.  This switch shall be permitted only for the purpose of preventing regeneration during loading of the regeneration system and during the pre-conditioning cycles. However, it shall not be used during the measurement of emissions during the regeneration phase; rather the emission test shall be carried out with the unchanged Original Equipment Manufacturer's (OEM) control unit.

         3.1. Exhaust emission measurement between two cycles where regenerative phases occur

         Average emissions between regeneration phases and during loading of the regenerative device shall be determined from the arithmetic mean of several approximately equidistant (if more than 2) Type I operating cycles or equivalent engine test bench cycles.  As an alternative  the manufacturer may provide data to show that the emissions remain constant (+15 per cent) between regeneration phases.  In this case, the emissions measured during the regular Type I test may be used.  In any other case emissions measurement for at least two Type I operating cycles or equivalent engine test bench cycles must be completed: one immediately after regeneration (before new loading) and one as close as possible prior to a regeneration phase.  All emissions measurements and calculations shall be carried out according to Annex 4, paragraphs 5., 6., 7. and 8.

         3.1.2. The loading process and Ki determination shall be made during the Type I operating 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,