{
  "url": "https://openlegislation.uk/eu-regulation-2017-2400/annex-V/division-5/division-5.4",
  "json_url": "https://openlegislation.uk/eu-regulation-2017-2400/annex-V/division-5/division-5.4.json",
  "legislation": "eur/2017/2400",
  "legislation_title": "Commission Regulation (EU) 2017/2400 of 12 December 2017 implementing Regulation (EC) No 595/2009 of the European Parliament and of the Council as regards the determination of the CO2 emissions and fuel consumption of heavy-duty vehicles and amending Directive 2007/46/EC of the European Parliament and of the Council and Commission Regulation (EU) No 582/2011 (Text with EEA relevance)",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2017-2400",
  "path": "annex/V/division/5/division/5.4",
  "kind": "division",
  "number": "5.4",
  "heading": "Correction factor for engines equipped with exhaust after-treatment systems that are regenerated on a periodic basis",
  "text": "For engines equipped with exhaust after-treatment systems that are regenerated on a periodic basis defined in accordance with paragraph 6.6.1 of Annex 4 to UN/ECE Regulation 49 Rev.06, fuel consumption shall be adjusted to account for regeneration events by a correction factor.\nThis correction factor, CFRegPer, shall be determined in accordance with paragraph 6.6.2 of Annex 4 to UN/ECE Regulation 49 Rev.06.\nFor engines equipped with exhaust after-treatment systems with continuous regeneration, defined in accordance with paragraph 6.6 of Annex 4 to UN/ECE Regulation 49 Rev.06, no correction factor shall be determined and the value of the factor CFRegPer shall be set to 1.\nThe engine full load curve recorded in accordance with paragraph 4.3.1 shall be used for the denormalization of the WHTC reference cycle and all calculations of reference values performed in accordance with paragraphs 7.4.6, 7.4.7 and 7.4.8 of Annex 4 to UN/ECE Regulation 49 Rev.06.\nIn addition to the provisions defined in Annex 4 to UN/ECE Regulation 49 Rev.06 the actual fuel mass flow consumed by the engine in accordance with paragraph 3.4 shall be recorded for each WHTC hot start test performed in accordance with paragraph 6.6.2 of Annex 4 to UN/ECE Regulation 49 Rev.06.\nThe specific fuel consumption for each WHTC hot start test performed shall be calculated by the following equation:\nSFCmeas, m = (Σ FCmeas, m) / (Wact, m)\nwhere:\nSFCmeas, m Specific fuel consumption [g/kWh]\nΣ FCmeas,m Total fuel consumption over the WHTC [g] determined in accordance with paragraph 5.2 of this Annex\nWact, m Total engine work over the WHTC [kWh] determined in accordance with paragraph 5.1 of this Annex\nm Index defining each individual WHTC hot start test\nThe specific fuel consumption values for the individual WHTC tests shall be weighted by the following equation:\nSFC w = n × SFC avg + n r × SFC avg,r n + n r where:\nn the number of WHTC hot start tests without regeneration\nnr the number of WHTC hot start tests with regeneration (minimum number is one test)\nSFCavg the average specific fuel consumption from all WHTC hot start tests without regeneration [g/kWh]\nSFCavg,r the average specific fuel consumption from all WHTC hot start tests with regeneration [g/kWh]\nThe correction factor, CFRegPer, shall be calculated by the following equation:\nCF RegPer = SFC w SFC avg",
  "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/2017/2400/annex/V/division/5/division/5.4",
    "retrieved_at": "2026-11-01T14:44:20.922900+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."
}