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Appendix 6

United Kingdom

Original text. Later amendments are not shown.

Ammonia emission calculation

1.

Calculation of the mean concentration for transient (NRTC and LSI-NRTC) test cycles and RMC

The mean NH3 concentration in the exhaust gas over the test cycle cNH3 [ppm] shall be determined by integrating the instantaneous values over the cycle. Equation (7-179) shall be applied:

c NH3 = 1 n ∑ i = 1 i = n c NH3,i (7-179)

Where:

cNH3,i

  • is the instantaneous NH3 concentration in the exhaust gas [ppm]

    • n

  • is the number of measurements

    • For the NRTC, the final test result shall be calculated by means of equation (7-180):

    F1c NH3 = (0,1 × c NH3,cold ) + (0,9 × c NH3,hot ) (7-180)

    Where:

    cNH3,cold

  • is the mean NH3 concentration of the cold-start NRTC [ppm]

    • cNH3,hot

  • is the mean NH3 concentration of the hot-start NRTC [ppm]

    • 2.

    Calculation of the mean concentration for discrete-mode NRSC

    The mean NH3 concentration in the exhaust gas over the test cycle cNH3 [ppm] shall be determined by measuring the mean concentration for each mode and weighting the result in accordance with the weighting factors applicable to the test cycle. Equation (7-181) shall be applied:

    c NH3 = ∑ i = 1 N mode c – NH3,i × WF i (7-181)

    Where:

    c – NH3,i

  • is the mean NH3 concentration in the exhaust gas for mode i [ppm]

    • Nmode

  • is the number of modes in the test cycle

    • WFi

  • is the weighting factor for the mode i [-]

    • Annotations

    Textual amendments

    F1

    Substituted by Commission Delegated Regulation (EU) 2018/989 of 18 May 2018 amending and correcting Delegated Regulation (EU) 2017/654 supplementing Regulation (EU) 2016/1628 of the European Parliament and of the Council with regard to technical and general requirements relating to emission limits and type-approval for internal combustion engines for non-road mobile machinery (Text with EEA relevance).