Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:13:p26
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 13 (pt 26/56)
Character Range: 369056–371996

and the corrected brake-specific emission values shall be within ±4 per cent of the uncorrected brake-specific emission values or within ±4 per cent of the respective limit value, whichever is greater. If the drift is greater than 4 per cent, the test shall be voided.
 If drift correction is applied, only the drift-corrected emission results shall be used when reporting emissions.
8.6.2. Calculation of NMHC and CH4
The calculation of NMHC and CH4 depends on the calibration method used. The FID for the measurement without NMC (lower path of Appendix 2 to this annex, Figure 11), shall be calibrated with propane. For the calibration of the FID in series with NMC (upper path of Appendix 2 to this annex, Figure 11), the following methods are permitted.
(a) Calibration gas – propane; propane bypasses NMC;
(b) Calibration gas – methane; methane passes through NMC.
 The concentration of NMHC and CH4 shall be calculated as follows for (a):
 (67)
 (68)
 The concentration of NMHC and CH4 shall be calculated as follows for (b):
                      (67a)
                      (68a)
 Where:
                     cHC(w/NMC) is the HC concentration with sample gas flowing through the NMC, ppm
                     cHC(w/oNMC) is the HC concentration with sample gas bypassing the NMC, ppm
                     rh is the methane response factor as determined per paragraph 9.3.7.2.
                     EM is the methane efficiency as determined per paragraph 9.3.8.1.
                     EE is the ethane efficiency as determined per paragraph 9.3.8.2.
 If rh < 1.05, it may be omitted in equations 67, 67a and 68a.
8.6.3. Calculation of the specific emissions
The specific emissions egas or ePM (g/kWh) shall be calculated for each individual component in the following ways depending on the type of test cycle.
For the WHSC, hot WHTC, or cold WHTC, the following equation shall be applied:
 (69)
Where:
m is the mass emission of the component, g/test
Wact is the actual cycle work as determined according to paragraph 7.8.6., kWh
 For the WHTC, the final test result shall be a weighted average from cold start test and hot start test according to the following equation:
 (70)
Where:
                   mcold is the mass emission of the component on the cold start test, g/test
                   mhot is the mass emission of the component on the hot start test, g/test
                   Wact,cold is the actual cycle work on the cold start test, kWh
                   Wact,hot is the actual cycle work on the hot start test, kWh
If periodic regeneration in accordance with paragraph 6.6.2. applies, the regeneration adjustment factors kr,u or kr,d shall be multiplied with or be added to, respectively, the specific emissions result e as determined in equations 69 and 70.
9. Equipment specification and verification
 This annex does not contain details of flow, pressure, and temperature measuring equipment or systems. Instead,