Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:9:p19
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 9 (pt 19/22)
Character Range: 199335–202283

000 Pa of the upper limit of the engine operating at the speed of declared maximum power and full load and a volume within
              ± 40 % of that specified by the manufacturer. A test shop system may be used, provided it represents actual engine operating conditions. The exhaust system shall conform to the requirements for exhaust gas sampling, as set out in Annex III, Appendix 4, Section 3.4 and in Annex V, Section 2.2.1, EP and Section 2.3.1, EP.

              If the engine is equipped with an exhaust aftertreatment device, the exhaust pipe must have the same diameter as found in-use for at least 4 pipe diameters upstream to the inlet of the beginning of the expansion section containing the aftertreatment device. The distance from the exhaust manifold flange or turbocharger outlet to the exhaust aftertreatment device shall be the same as in the vehicle configuration or within the distance specifications of the manufacturer. The exhaust backpressure or restriction shall follow the same criteria as above, and may be set with a valve. The aftertreatment container may be removed during dummy tests and during engine mapping, and replaced with an equivalent container having an inactive catalyst support.

2.5.                            Cooling system

              An engine cooling system with sufficient capacity to maintain the engine at normal operating temperatures prescribed by the manufacturer shall be used.

2.6.                            Lubricating oil

              Specifications of the lubricating oil used for the test shall be recorded and presented with the results of       the test, as specified in Annex II, Appendix 1, Section 7.1.

2.7.                            Fuel

              The fuel shall be the reference fuel specified in Annex IV.

              The fuel temperature and measuring point shall be specified by the manufacturer within the limits given in Annex II, Appendix 1, Section 1.16.5. The fuel temperature shall not be lower than 306 K (33 °C). If not specified, it shall be 311 K ± 5 K (38 °C ± 5 °C) at the inlet to the fuel supply.

              For NG and LPG fuelled engines, the fuel temperature and measuring point shall be within the limits given in Annex II, Appendix 1, Section 1.16.5 or in Annex II, Appendix 3, Section 1.16.5 in cases where the engine is not a parent engine.

2.8.                            Testing of exhaust aftertreatment systems

              If the engine is equipped with an exhaust aftertreatment system, the emissions measured on the test cycle(s) shall be representative of the emissions in the field. If this cannot be achieved with one single test cycle (e.g. for particulate filters with periodic regeneration), several test cycles shall be conducted and the test results averaged and/or weighted. The exact procedure shall be agreed by the engine manufacturer and the Technical Service based upon good engineering judgement.

Appendix