Directive 2005/55/EC of the European Parliament and of the Council (repealed)Show full title

IN ANNEX III, APPENDIX 2:

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 NO_x correction should be made. The test is void if these conditions are not met.

4.3. Calculation of the emission mass flow

4.3.1 Systems with constant mass flow

For systems with heat exchanger, the mass of the pollutants (g/test) shall be determined from the following equations:

[(1)]

[(2)]

[(3)]

where,

NO_{x conc}, CO_conc, HC_conc (1), NMHC_conc

=

average background corrected concentrations over the cycle from integration (mandatory for NO_x and HC) or bag measurement, ppm;

M_TOTW

=

total mass of diluted exhaust gas over the cycle as determined in Section 4.1, kg.

4.3.1.1. Determination of the background corrected concentrations

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;

conc_e

=

concentration of the respective pollutant measured in the diluted exhaust gas, ppm;

conc_d

=

concentration of the respective pollutant measured in the dilution air, ppm;

DF

=

dilution factor.

The dilution factor shall be calculated as follows:

where,

CO_2conce

=

concentration of CO₂ in the diluted exhaust gas, % vol

HC_conce

=

concentration of HC in the diluted exhaust gas, ppm C1

CO_conce

=

concentration of CO in the diluted exhaust gas, ppm

F_S

=

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 CH_αO_βN_γ, be calculated as follows:

Alternatively, if the fuel composition is not known, the following stoichiometric factors may be used:

F_S (Ethanol) = 12,3

4.3.2. Systems with flow compensation

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:

[(1)]

[(2)]

[(3)]

where,

conc_e

=

concentration of the respective pollutant measured in the diluted exhaust gas, ppm;

conc_d

=

concentration of the respective pollutant measured in the dilution air, ppm;

M_TOTW,i

=

instantaneous mass of the diluted exhaust gas (see Section 4.1), kg;

M_TOTW

=

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.

4.4. Calculation of the specific emissions

The emissions (g/kWh) shall be calculated for all individual components in the following way:

where,

W_act

=

actual cycle work as determined in Section 3.9.2, kWh.

(1)

Based on C1 equivalent.