Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:13:p20
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 13 (pt 20/56)
Character Range: 351232–354298

approval of the Type Approval Authority , the particulate mass may be corrected for the particulate level of the diluent, as determined in paragraph 7.5.6., in line with good engineering practice and the specific design features of the particulate measurement system used.
8.4.3.2. Calculation of mass emission
 Depending on system design, the mass of particulates (g/test) shall be calculated by either of the methods in paragraph 8.4.3.2.1. or 8.4.3.2.2. after buoyancy correction of the particulate sample filter according to paragraph 8.3.
8.4.3.2.1. Calculation based on sample ratio
mPM = mp / (rs x 1,000)  (43)
 Where:
                  mp is the particulate mass sampled over the cycle, mg
                  rs is the average sample ratio over the test cycle
 With
                      (44)
 Where:
                  mse is the sample mass over the cycle, kg
                  mew is the total exhaust mass flow over the cycle, kg
                  msep is the mass of diluted exhaust gas passing the particulate collection filters, kg
                  msed is the mass of diluted exhaust gas passing the dilution tunnel, kg
 In case of the total sampling type system, msep and msed are identical.
8.4.3.2.2. Calculation based on dilution ratio
                      (45)
 Where:
                  mp is the particulate mass sampled over the cycle, mg
                  msep is the mass of diluted exhaust gas passing the particulate collection filters, kg
                  medf is the mass of equivalent diluted exhaust gas over the cycle, kg
 The total mass of equivalent diluted exhaust gas mass over the cycle shall be determined as follows:
                      (46)
qmedf,i = qmew,i x rd,i (47)
 (48)
 Where:
                  qmedf,i is the instantaneous equivalent diluted exhaust mass flow rate, kg/s
                  qmew,i is the instantaneous exhaust mass flow rate, kg/s
                  rd,i is the instantaneous dilution ratio
                  qmdew,i is the instantaneous diluted exhaust mass flow rate, kg/s
                  qmdw,i is the instantaneous diluent mass flow rate, kg/s
                  f is the data sampling rate, Hz
                  n is the number of measurements
8.5. Full flow dilution measurement (CVS)
 The concentration signals, either by integration over the cycle or by bag sampling, of the gaseous components shall be used for the calculation of the mass emissions by multiplication with the diluted exhaust mass flow rate. The exhaust mass flow rate shall be measured with a constant volume sampling (CVS) system, which may use a positive displacement pump (PDP), a critical flow venturi (CFV) or a subsonic venturi (SSV) with or without flow compensation.
 For bag sampling and particulate sampling, a proportional sample shall be taken from the diluted exhaust gas of the CVS system. For a system without flow compensation, the ratio of sample flow to CVS flow shall not vary by more than ±2.5 per cent from the set point of the test. For a system with flow compensation, each individual flow rate shall