Document ID: chunk:federal_register_of_legislation:F2022C00213:reg:120:p22
Version: federal_register_of_legislation:F2022C00213
Segment Type: reg
Provision Reference: reg 120 (pt 22/56)
Character Range: 214950–218047

regenerating systems.

       2.1.1. Identical parameters are:

        Engine:
            (a) number of cylinders,
            (b) engine capacity (± 15 per cent),
            (c) number of valves,
            (d) fuel system,
            (e) combustion process (2 stroke, 4 stroke, rotary).

            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 maximum temperature / pressure).

       2.2. Vehicle types of different reference masses

        The Ki factor developed by the procedures in this annex for type approval of a vehicle type with a periodically regenerating system as defined in paragraph 2.16. 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.

2.3. Instead of carrying out the test procedures defined in the following section, a fixed Ki value of 1.05 may be used, if the technical service sees no reason that this value could be exceeded.

       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. Measurement of carbon dioxide emission and fuel consumption between two cycles where regenerative phases occur

       3.1.1. Average of carbon dioxide emission and fuel consumption 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 carbon dioxide emission and fuel consumption remain constant + 4 per cent between regeneration phases. In this case, the carbon dioxide emission and fuel consumption 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 6.

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