(iii)

Sections 4 and 5 are replaced by the following: ‘5. CALCULATION OF THE GASEOUS EMISSIONS 5.1. Data evaluation For the evaluation of the gaseous emissions in the diluted exhaust gas, the emission concentrations (HC, CO and NOx) and the diluted exhaust gas mass flow rate shall be recorded according to section 3.8.2.1 and stored on a computer system. For analogue analysers the response shall be recorded, and the calibration data may be applied online or offline during the data evaluation. For the evaluation of the gaseous emissions in the raw exhaust gas, the emission concentrations (HC, CO and NOx) and the exhaust gas mass flow rate shall be recorded according to section 3.8.2.2 and stored on a computer system. For analogue analysers the response shall be recorded, and the calibration data may be applied online or offline during the data evaluation. 5.2. Dry/wet correction If the concentration is measured on a dry basis, it shall be converted to a wet basis according to the following formula. For continuous measurement, the conversion shall be applied to each instantaneous measurement before any further calculation. cwet = kW × cdry The conversion equations of section 5.2 of Appendix 1 to this Annex shall apply. 5.3. NOx correction for humidity and temperature As the NOx emission depends on ambient air conditions, the NOx concentration shall be corrected for ambient air temperature and humidity with the factors given in section 5.3 of Appendix 1 to this Annex. The factors are valid in the range between 0 and 25 g/kg dry air. 5.4. Calculation of the emission mass flow rates The emission mass over the cycle (g/test) shall be calculated as follows depending on the measurement method applied. The measured concentration shall be converted to a wet basis according to section 5.2 of Appendix 1 to this Annex, if not already measured on a wet basis. The respective values for u gas shall be applied that are given in Table 6 of Appendix 1 to this Annex for selected components based on ideal gas properties and the fuels relevant for this Directive. If applicable, the concentration of NMHC and CH4 shall be calculated by either of the methods shown in section 3.3.4 of Appendix 4 to this Annex, as follows: 5.4.1. Determination of the background corrected concentrations (full flow dilution system, only) The average background concentration of the gaseous pollutants in the dilution air shall be subtracted from measured concentrations to get the net concentrations of the pollutants. The average values of the background concentrations can be determined by the sample bag method or by continuous measurement with integration. The following formula shall be used. Text of image c = ce - cd × (1 - 1 D) where: The dilution factor shall be calculated as follows: 5.5. Calculation of the specific emissions The emissions (g/kWh) shall be calculated in the following way: 5.5.1. In case of a periodic exhaust aftertreatment system, the emissions shall be weighted as follows: Text of image MGas = (n1 × MGas,n1 + n2 × MGas,n2) / (n1 + n2) where: 6. CALCULATION OF THE PARTICULATE EMISSION (IF APPLICABLE) 6.1. Data evaluation The particulate filter shall be returned to the weighing chamber no later than one hour after completion of the test. It shall be conditioned in a partially covered petri dish, which is protected against dust contamination, for at least one hour, but not more than 80 hours, and then weighed. The gross weight of the filters shall be recorded and the tare weight subtracted, which results in the particulate sample mass m f. For the evaluation of the particulate concentration, the total sample mass (m sep) through the filters over the test cycle shall be recorded. If background correction is to be applied, the dilution air mass (m d) through the filter and the particulate mass (m f,d) shall be recorded. 6.2. Calculation of the mass flow 6.2.1. Full flow dilution system The particulate mass (g/test) shall be calculated as follows: Text of image mPT = mf msep × med 1000 where: 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. msep = mset – mssd where: If the particulate background level of the dilution air is determined in accordance with section 3.4, the particulate mass may be background corrected. In this case, the particulate mass (g/test) shall be calculated as follows: Text of image mPT = [mf msep - (mf,d md × (1 - 1 D))] × med 1000 where: 6.2.2. Partial flow dilution system The mass of particulates (g/test) shall be calculated by either of the following methods: 6.3. Calculation of the Specific Emission The particulate emission (g/kWh) shall be calculated in the following way: Text of image MPT = mPT Wact where: W act = 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: Text of image PT = (n1 × PTn1 + n2 × PT n2) / (n1 + n2) where: for the raw exhaust gas: Text of image mgas = ugas × Σ i = 1 i = n cgas,i × qmew,i × 1 f where: u gas | = | ratio between density of exhaust component and density of exhaust gas from table 6 c gas,i | = | instantaneous concentration of the respective component in the raw exhaust gas, ppm q mew,i | = | instantaneous exhaust mass flow rate, kg/s f | = | data sampling rate, Hz n | = | number of measurements for the diluted exhaust gas without flow compensation: mgas = ugas × cgas × med where: u gas | = | ratio between density of exhaust component and density of air from table 6 c gas | = | average background corrected concentration of the respective component, ppm m ed | = | total diluted exhaust mass over the cycle, kg for the diluted exhaust gas with flow compensation: Text of image mgas = [ugas × Σ i = 1 i = n (ce,i × qmdew,i × 1 f)] - [(med × cd × (1 - 1/D) × ugas)] where: c e,i | = | instantaneous concentration of the respective component measured in the diluted exhaust gas, ppm c d | = | concentration of the respective component measured in the dilution air, ppm q mdew,i | = | instantaneous diluted exhaust gas mass flow rate, kg/s m ed | = | total mass of diluted exhaust gas over the cycle, kg u gas | = | ratio between density of exhaust component and density of air from table 6 D | = | dilution factor (see section 5.4.1) GC method (full flow dilution system, only): cNMHC = cHC – cCH4 NMC method: Text of image cNMHC = cHC(w/oCutter) × (1 - EM) - cHC (w/Cutter) EE - EM Text of image cCH4 = cHC(w/Cutter) - cHC(w/oCutter) × (1 - EE) EE - EM where: c HC(w/Cutter) | = | HC concentration with the sample gas flowing through the NMC c HC(w/oCutter) | = | HC concentration with the sample gas bypassing the NMC c e | = | concentration of the respective pollutant measured in the diluted exhaust gas, ppm c d | = | concentration of the respective pollutant measured in the dilution air, ppm D | = | dilution factor for diesel and LPG fueled gas engines Text of image D = FS cCO2 + (cHC + cCO) × 10–4 for NG fueled gas engines Text of image D = FS cCO2 + (cNMHC + cCO) × 10–4 where: Concentrations measured on dry basis shall be converted to a wet basis in accordance with section 5.2 of Appendix 1 to this Annex. The stoichiometric factor shall be calculated as follows: Text of image FS = 100 × 1 1 + α 2 + 3,76 × (1 + α 4 - ε 2) where: α, ε are the molar ratios referring to a fuel CH α O ε Alternatively, if the fuel composition is not known, the following stoichiometric factors may be used: c CO2 | = | concentration of CO2 in the diluted exhaust gas, % vol c HC | = | concentration of HC in the diluted exhaust gas, ppm C1 c NMHC | = | concentration of NMHC in the diluted exhaust gas, ppm C1 c CO | = | concentration of CO in the diluted exhaust gas, ppm F S | = | stoichiometric factor F S (diesel) | = | 13,4 F S (LPG) | = | 11,6 F S (NG) | = | 9,5 all components, except NOx: Text of image Mgas = mgas Wact NOx: Text of image Mgas = mgas × kh Wact where: W act = actual cycle work as determined according to section 3.9.2. n1 | = | number of ETC tests between two regenerations n2 | = | number of ETC during a regeneration (minimum of one ETC test) M gas,n2 | = | emissions during a regeneration M gas,n1 | = | emissions after a regeneration. m f | = | particulate mass sampled over the cycle, mg m sep | = | mass of diluted exhaust gas passing the particulate collection filters, kg m ed | = | mass of diluted exhaust gas over the cycle, kg m set | = | mass of double diluted exhaust gas through particulate filter, kg m ssd | = | mass of secondary dilution air, kg 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. Text of image mPT = mf msep × medf 1000 where: The total mass of equivalent diluted exhaust gas mass over the cycle shall be determined as follows: Text of image medf = i = n Σ i = 1 qmedf,i × 1 f Text of image qmedf,i = qmew,i × rd,i Text of image rd,i = qmdew,,i (qmdew,,i - qmdw,,i) where: m f | = | particulate mass sampled over the cycle, mg m sep | = | mass of diluted exhaust gas passing the particulate collection filters, kg m edf | = | mass of equivalent diluted exhaust gas over the cycle, kg q medf,i | = | instantaneous equivalent diluted exhaust mass flow rate, kg/s q mew,i | = | instantaneous exhaust mass flow rate, kg/s r d,i | = | instantaneous dilution ratio q mdew,i | = | instantaneous diluted exhaust mass flow rate through dilution tunnel, kg/s q mdw,i | = | instantaneous dilution air mass flow rate, kg/s f | = | data sampling rate, Hz n | = | number of measurements Text of image mPT = mf rs × 1000 where: with: Text of image rs = mse mew × msep msed where: Note: In case of the total sampling type system, m sep and M sed are identical. m f | = | particulate mass sampled over the cycle, mg r s | = | average sample ratio over the test cycle m se | = | sample mass over the cycle, kg m ew | = | total exhaust mass flow over the cycle, kg m sep | = | mass of diluted exhaust gas passing the particulate collection filters, kg m sed | = | mass of diluted exhaust gas passing the dilution tunnel, kg. n1 | = | number of ETC tests between two regeneration events n2 | = | number of ETC tests during a regeneration (minimum of one ETC) Text of image PTn2 | = | emissions during a regeneration Text of image PTn1 | = | emissions outside a regeneration.’

← anx_I__point_3__point_f__point_ii__table__5 · All articles · (a) →

Source: EUR-Lex (Cellar) · retrieved 2026-11-10 · Text as adopted (Official Journal); later amendments are not incorporated in this text.