# Commission Delegated Regulation (EU) 2017/654 of 19 December 2016 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, Division 2.3.2.1: Dilution system

Extent: E+W+S+N.I.

All calculations shall be based upon the average values of the individual modes i during the sampling period.
(a) For partial-flow dilution, the equivalent mass flow of diluted exhaust gas shall be determined by means of equation (7-51) and the system with flow measurement shown in Figure 9.2:
q m edf = q m ew × r d
(7-51)
r d = q m dew q m dew − q m dw
(7-52)
Where:
qm edf equivalent diluted exhaust gas mass flow rate [kg/s]
qm ew exhaust gas mass flow rate on a wet basis [kg/s]
r d dilution ratio [-]
qm dew diluted exhaust gas mass flow rate on a wet basis [kg/s]
qm dw dilution air mass flow rate [kg/s]
(b) For full-flow dilution systems qm dew is used as qm edf.

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Source: https://www.legislation.gov.uk/eur/2017/654/annex/VII/division/2/division/2.3/division/2.3.2/division/2.3.2.1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-2/division-2.3/division-2.3.2/division-2.3.2.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.