{
  "url": "https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-2/division-2.3/division-2.3.2/division-2.3.2.1",
  "json_url": "https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-2/division-2.3/division-2.3.2/division-2.3.2.1.json",
  "legislation": "eur/2017/654",
  "legislation_title": "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",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2017-654",
  "path": "annex/VII/division/2/division/2.3/division/2.3.2/division/2.3.2.1",
  "kind": "division",
  "number": "2.3.2.1",
  "heading": "Dilution system",
  "text": "All calculations shall be based upon the average values of the individual modes i during the sampling period.\n(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:\nq m edf = q m ew × r d\n(7-51)\nr d = q m dew q m dew − q m dw\n(7-52)\nWhere:\nqm edf equivalent diluted exhaust gas mass flow rate [kg/s]\nqm ew exhaust gas mass flow rate on a wet basis [kg/s]\nr d dilution ratio [-]\nqm dew diluted exhaust gas mass flow rate on a wet basis [kg/s]\nqm dw dilution air mass flow rate [kg/s]\n(b) For full-flow dilution systems qm dew is used as qm edf.",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2017/654/annex/VII/division/2/division/2.3/division/2.3.2/division/2.3.2.1",
    "retrieved_at": "2026-11-01T14:45:01.864924+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}