Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p124
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 124/150)
Character Range: 1068706–1071796

minimum acceptable reagent quality CDmin during type approval by performing the hot part of the WHTC cycle, in accordance with the provisions of Annex 4 to this Regulation, using a reagent with the concentration CDmin.
A.6.2. The test shall follow the appropriate pre-conditioning cycle, permitting a closed loop NOx control system to perform adaptation to the quality of the reagent with the concentration CDmin.
A.6.3. The pollutant emissions resulting from this test shall be lower than the emission limits specified in paragraphs 7.1.1. and 7.1.1.1. of this annex.

         Annex 12 CO2 emissions and fuel consumption
1.  Introduction
              1.1. This annex sets out the provisions and test procedures for reporting CO2 emissions and fuel consumption.
2.  General requirements
              2.1. CO2 emissions and fuel consumption shall be determined over the WHTC and WHSC test cycles in accordance with paragraphs 7.2. to 7.8. of Annex 4.
              2.2. The test results shall be reported as cycle averaged brake specific values and expressed in the unit of g/kWh.
3.  Determination of CO2 emissions
              3.1. Raw measurement
              This paragraph shall apply, if CO2 is measured in the raw exhaust gas.
              3.1.1. Measurement
              CO2 in the raw exhaust gas emitted by the engine submitted for testing shall be measured with a non-dispersive infrared (NDIR) analyser in accordance with paragraph 9.3.2.3. and Appendix 2 to Annex 4.
              The measurement system shall meet the linearity requirements of paragraph 9.2. and Table 7 of Annex 4.
              The measurement system shall meet the requirements of paragraphs 9.3.1., 9.3.4. and 9.3.5. of Annex 4.
              3.1.2. Data evaluation
              The relevant data shall be recorded and stored in accordance with paragraph 7.6.6. of Annex 4. The traces of the recorded concentrations and the trace of the exhaust gas mass flow rate shall be time aligned with the transformation time as defined in paragraph 3.1. of Annex 4.
              3.1.3. Calculation of cycle averaged emission
              If measured on a dry basis, the dry/wet correction according to paragraph 8.1. of Annex 4 shall be applied to the instantaneous concentration values before any further calculation is done.
              The mass of CO2 (g/test) shall be determined by calculating the instantaneous mass emissions from the raw CO2 concentration and the exhaust gas mass flow, aligned with respect to their transformation times as determined in accordance with paragraph 8.4.2.2. of Annex 4, integrating the instantaneous values over the cycle, and multiplying the integrated value with the u values of CO2 from Table 5 of Annex 4.
              The following equation shall be applied:
              Where:
              uCO2 is the ratio between CO2 density and density of the exhaust gas
              cCO2,i is the instantaneous CO2 concentration in the exhaust gas, ppm
              qmew,i is the instantaneous exhaust mass flow, kg/s
              f is the data sampling rate,