Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p139
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 139/150)
Character Range: 1111731–1114677

2.2.2. shall be carried out in accordance with the instructions laid down in paragraph 7.6.5. of Annex 4 to this Regulation.

              2.2.4. Alternatively, the relevant data can be collected by driving a fully loaded vehicle equipped with the selected exhaust after-treatment system incorporating the replacement pollution control device. The test can be carried out either on the road following the trip requirements of paragraphs 4.5. to 4.5.5. of Annex 8 to this Regulation with comprehensive recording of the driving data, or on a suitable chassis dynamometer. If an on-road test is chosen, the vehicle shall be driven over a cold test-cycle, as set out in Appendix 6 to this annex, followed by nine hot test-cycles, identical to the cold one, in a way that the work developed by the engine is the same as the one achieved under paragraphs 2.2.1. and 2.2.2. If a chassis dynamometer is chosen, the simulated road gradient of the test-cycle in Appendix 6 shall be adapted to match the work developed by the engine over the WHTC.

              2.2.5. The Type Approval Authority shall refuse the temperature data obtained under paragraph 2.2.4. if it deems those data to be unrealistic and shall request either the repetition of the test, or the carrying out of a test pursuant to paragraphs 2.2.1., 2.2.2. and 2.2.3.

              2.2.6. Temperatures in the replacement pollution control device shall be recorded during the whole test sequence, at the location with the highest temperature.

              2.2.7. In cases where the location with the highest temperature varies over time, or where that location is difficult to define, multiple bed temperatures should be recorded at suitable locations.

              2.2.8. The number and locations of the temperature measurements shall be selected by the manufacturer, in agreement with the Type Approval Authority, based on best engineering judgement.

              2.2.9. With the agreement of the Type Approval Authority, a single catalyst bed temperature or the catalyst inlet temperature may be used if measuring multiple bed temperatures is proven to be unfeasible or too difficult.

Figure 1
Example of temperature sensors location in a generic after-treatment device

Figure 2
Example of temperature sensors location for DPF

              2.2.10. The temperatures shall be measured and recorded at a minimum rate of once every second (1 Hz) during the test sequence.

              2.2.11. The measured temperatures shall be tabulated into a histogram with temperature bins no larger than 10 ºC. In the case mentioned in paragraph 2.2.7., the highest temperature each second shall be the one recorded in the histogram. Each bar of the histogram shall represent the cumulated frequency in seconds of the measured temperatures falling in the specific bin.

              2.2.12. The time in hours corresponding to each temperature bin must be determined and then extrapolated