Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:9:p1
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 9 (pt 1/71)
Character Range: 209061–212241

9             B                25             0,10                2 minutes
 10           C                100            0,08                2 minutes
 11           C                25             0,05                2 minutes
 12           C                75             0,05                2 minutes
 13           C                50             0,05                2 minutes

2.7.2.                        Test sequence

              The test sequence shall be started. The test shall be performed in the order of the mode numbers as set out in Section 2.7.1.

              The engine must be operated for the prescribed time in each mode, completing engine speed and load changes in the first 20 seconds. The specified speed shall be held to within ± 50 rpm and the specified torque shall be held to within ± 2 % of the maximum torque at the test speed.

              At the manufacturers request, the test sequence may be repeated a sufficient number of times for sampling more particulate mass on the filter. The manufacturer shall supply a detailed description of the data evaluation and calculation procedures. The gaseous emissions shall only be determined on the first cycle.

2.7.3.                        Analyser response

              The output of the analysers shall be recorded on a strip chart recorder or measured with an equivalent data acquisition system with the exhaust gas flowing through the analysers throughout the test cycle.

2.7.4.                        Particulate sampling

              One pair of filters (primary and back-up filters, see Annex III, Appendix 4) shall be used for the complete test procedure. The modal weighting factors specified in the test cycle procedure shall be taken into account by taking a sample proportional to the exhaust mass flow during each individual mode of the cycle. This can be achieved by adjusting sample flow rate, sampling time, and/or dilution ratio, accordingly, so that the criterion for the effective weighting factors in Section 5.6 is met.

              The sampling time per mode must be at least 4 seconds per 0,01 weighting factor. Sampling must be conducted as late as possible within each mode. Particulate sampling shall be completed no earlier than 5 seconds before the end of each mode.

2.7.5.                        Engine conditions

              The engine speed and load, intake air temperature and depression, exhaust temperature and backpressure, fuel flow and air or exhaust flow, charge air temperature, fuel temperature and humidity shall be recorded during each mode, with the speed and load requirements (see Section 2.7.2) being met during the time of particulate sampling, but in any case during the last minute of each mode.

              Any additional data required for calculation shall be recorded (see Sections 4 and 5).

2.7.6.                        NOx check within the control area

              The NOx check within the control area shall be performed immediately upon completion of mode 13.

              The engine shall be conditioned at mode 13 for a period of three minutes before the start of the measurements. Three measurements shall be made at