ANNEX VIII

In the case of ethanol-fuelled diesel engines, the following specific modifications to the appropriate paragraphs, equations and factors will apply to the test procedures defined in Annex III to this Directive. with, A | = | 0,181 GFUEL/GAIRD - 0,0266 B | = | – 0,123 GFUEL/GAIRD + 0,00954 Ta | = | temperature of the air, K Ha | = | humidity of the intake air, g water per kg dry air The emission mass flow rates (g/h) for each mode shall be calculated as follows, assuming the exhaust gas density to be 1,272 kg/m3 at 273 K (0 °C) and 101,3 kPa: where NOx conc, COconc, HCconc (1) are the average concentrations (ppm) in the raw exhaust gas, as determined in Section 4.1. If, optionally, the gaseous emissions are determined with a full flow dilution system, the following formulae shall be applied: where NOx conc, COconc, HCconc (1) are the average background corrected concentrations (ppm) of each mode in the diluted exhaust gas, as determined in Annex III, Appendix 2, Section 4.3.1.1. Sections 3.1, 3.4, 3.8.3 and 5 of Appendix 2 do not apply solely to diesel engines. They also apply to ethanol-fuelled diesel engines. | 4.2. | The conditions for the test should be arranged so that the air temperature and the humidity measured at the engine intake is set to standard conditions during the test run. The standard should be 6 ± 0,5 g water per kg dry air at a temperature interval of 298 ± 3 K. Within these limits no further NOx correction should be made. The test is void if these conditions are not met. For systems with heat exchanger, the mass of the pollutants (g/test) shall be determined from the following equations: where, NOx conc, COconc, HCconc (2), NMHCconc = average background corrected concentrations over the cycle from integration (mandatory for NOx and HC) or bag measurement, ppm; MTOTW = total mass of diluted exhaust gas over the cycle as determined in Section 4.1, kg. 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. where, conc | = | concentration of the respective pollutant in the diluted exhaust gas, corrected by the amount of the respective pollutant contained in the dilution air, ppm; conce | = | concentration of the respective pollutant measured in the diluted exhaust gas, ppm; concd | = | concentration of the respective pollutant measured in the dilution air, ppm; DF | = | dilution factor. The dilution factor shall be calculated as follows: where, CO2conce | = | concentration of CO2 in the diluted exhaust gas, % vol HCconce | = | concentration of HC in the diluted exhaust gas, ppm C1 COconce | = | concentration of CO in the diluted exhaust gas, ppm FS | = | stoichiometric factor Concentrations measured on dry basis shall be converted to a wet basis in accordance with Annex III, Appendix 1, Section 4.2. The stoichiometric factor shall, for the general fuel composition CHαOβNγ, be calculated as follows: Alternatively, if the fuel composition is not known, the following stoichiometric factors may be used: FS (Ethanol) = 12,3 For systems without heat exchanger, the mass of the pollutants (g/test) shall be determined by calculating the instantaneous mass emissions and integrating the instantaneous values over the cycle. Also, the background correction shall be applied directly to the instantaneous concentration value. The following formulae shall be applied: where, conce | = | concentration of the respective pollutant measured in the diluted exhaust gas, ppm; concd | = | concentration of the respective pollutant measured in the dilution air, ppm; MTOTW,i | = | instantaneous mass of the diluted exhaust gas (see Section 4.1), kg; MTOTW | = | total mass of diluted exhaust gas over the cycle (see Section 4.1), kg; DF | = | dilution factor as dertermined in Section 4.3.1.1. The emissions (g/kWh) shall be calculated for all individual components in the following way: where, Wact | = | actual cycle work as determined in Section 3.9.2, kWh.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-01 · Text as adopted (Official Journal); later amendments are not incorporated in this text.