Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:10:p24
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 10 (pt 24/30)
Character Range: 586577–589924

= mass of diluted exhaust gas over the cycle, kg

              If a double dilution system is used, the mass of the secondary dilution air shall be subtracted from the total mass of the double diluted exhaust gas sampled through the particulate filters.

             where:

             mset = mass of double diluted exhaust gas through particulate filter, kg
             mssd = mass of secondary dilution air, kg

              If the particulate background level of the dilution air is determined in accordance with section 3.4, the particulate mass may be back- ground corrected. In this case, the particulate mass (g/test) shall be calculated as follows:

             where:

            mPT, msep, med = see above
            md  = mass of primary dilution air sampled by background particulate sampler, kg
            mf,d  = mass of the collected background particulates of the primary dilution air, mg
            D  = dilution factor as determined in section 5.4.1.

        6.2.2. Partial flow dilution system

             The mass of particulates (g/test) shall be calculated by either of the following methods:

             (a)

             where:

             mf = particulate mass sampled over the cycle, mg
             msep = mass of diluted exhaust gas passing the particulate collection filters, kg
             medf = 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:

where:
qmedf,i  =  instantaneous equivalent diluted exhaust mass flow rate, kg/s
qmew,i   =  instantaneous exhaust mass flow rate, kg/s
rd,i     =  instantaneous dilution ratio

             qmdew,I = instantaneous diluted exhaust mass flow rate through dilution tunnel, kg/s
             q mdw,i = instantaneous dilution air mass flow rate, kg/s
             ƒ = data sampling rate, Hz
             n = number of measurements

             (b)

             where:

             mf = particulate mass sampled over the cycle, mg
             rs = average sample ratio over the test cycle

             with:

             where:

             mse = sample mass over the cycle, kg
             mew = total exhaust mass flow over the cycle, kg
             msep = mass of diluted exhaust gas passing the particulate collection filters, kg
             msed = mass of diluted exhaust gas passing the dilution tunnel, kg.

             Note: In case of the total sampling type system, msep and Msed are identical.

        6.2.  Calculation of the Specific Emission

             The particulate emission (g/kWh) shall be calculated in the following way:

             where:

             Wact = actual cycle work as determined according to section 3.9.2, kWh.

        6.3.1. In case of a periodic regeneration aftertreatment system, the emissions shall be weighted as follows:
             where:

             n1 = number of ETC tests between two regeneration events
             n2 = number of ETC tests during a regeneration (minimum of one ETC)

             = emissions during a regeneration

             = emissions outside a regeneration.'

  (g)     Appendix 4 is amended as follows:

       (i)      Section 1 is replaced by the following:

        '1.  INTRODUCTION

              Gaseous components, particulates,