{
  "url": "https://openlegislation.uk/eu-regulation-2017-2400/annex-V/appendix-8",
  "json_url": "https://openlegislation.uk/eu-regulation-2017-2400/annex-V/appendix-8.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/appendix/8",
  "kind": "appendix",
  "number": "8",
  "heading": null,
  "text": "Important evaluation steps and equations of the engine pre-processing tool\nThis Appendix describes the most important evaluation steps and underlying basic equations that are performed by the engine pre-processing tool. The following steps are performed during evaluation of the input data in the order listed:\n1.\nReading of input files and automatic check of input data\n1.1\nCheck of requirements for input data according to the definitions in paragraph 6.1 of this Annex\n1.2\nCheck of requirements for recorded FCMC data according to the definitions in paragraph 4.3.5.2 and subpoint (1) of paragraph 4.3.5.5 of this Annex\n2.\nCalculation of characteristic engine speeds from full load curves of parent engine and actual engine for certification according to the definitions in paragraph 4.3.5.2.1 of this Annex\n3.\nProcessing of fuel consumption (FC) map\n3.1\nFC values at nidle are copied to engine speed (nidle – 100 min– 1) in the map\n3.2\nFC values at n95h are copied to engine speed (n95h + 500 min– 1) in the map\n3.3\nExtrapolation of FC values at all engine speed setpoints to a torque value of (1.1 times Tmax_overall) by using least squares linear regression based on the 3 measured FC points with the highest torque values at each engine speed setpoint in the map\n3.4\nAdding of FC = 0 for interpolated motoring torque values at all engine speed setpoints in the map\n3.5\nAdding of FC = 0 for minimum of interpolated motoring torque values from subpoint (3.4) minus 100 Nm at all engine speed setpoints in the map\n4.\nSimulation of FC and cycle work over WHTC and respective subparts for actual engine for certification\n4.1.\nWHTC reference points are denormalized using the full load curve input in originally recorded resolution\n4.2.\nFC is calculated for WHTC denormalized reference values for engine speed and torque from subpoint 4.1\n4.3.\nFC is calculated with engine inertia set to 0\n4.4.\nFC is calculated with standard PT1-function (as in main vehicle simulation) for engine torque response active\n4.5.\nFC for all motoring points is set to 0\n4.6.\nFC for all non-motoring engine operation points is calculated from FC map by Delaunay interpolation method (as in main vehicle simulation)\n4.7.\nCycle work and FC are calculated according to equations defined in paragraphs 5.1 and 5.2 of this Annex\n4.8.\nSimulated specific FC values are calculated analogous to equations defined in paragraphs 5.3.1 and 5.3.2 of this Annex for measured values\n5.\nCalculation of WHTC correction factors\n5.1.\nMeasured values from input to pre-processing tool and simulated values from point (4) are used in accordance with the equations in points (5.2) to (5.4)\n5.2.\nCFUrban = SFCmeas,Urban/SFCsimu,Urban\n5.3.\nCFRural = SFCmeas,Rural/SFCsimu,Rural\n5.4.\nCFMW = SFCmeas,MW/SFCsimu,MW\n5.5.\nIn case that the calculated value for a correction factor is lower than 1, the respective correction factor is set to 1\n6.\nCalculation of cold-hot emission balancing factor\n6.1.\nThis factor is calculated in accordance with the equation in point (6.2)\n6.2.\nBFcold-hot = 1 + 0,1 × (SFCmeas,cold – SFCmeas,hot)/SFCmeas,hot\n6.3.\nIn case that the calculated value for this factor is lower than 1, the factor is set to 1\n7.\nCorrection of FC values in FC map to standard NCV\n7.1.\nThis correction is performed in accordance with the equation in point (7.2)\n7.2.\nFCcorrected = FCmeasured,map × NCVmeas/NVCstd\n7.3.\nFCmeasured,map shall be the FC value in the FC map input data processed in accordance with point (3)\n7.4.\nNCVmeas and NVCstd shall be defined in accordance with paragraph 5.3.3.1 of this Annex\n7.5.\nIn the case that reference fuel of the type B7 (Diesel / CI) in accordance with paragraph 3.2 of this Annex was used during testing, the correction in accordance with points (7.1) to (7.4) is not performed.\n8.\nConverting of engine full load and motoring torque values of the actual engine for certification to a logging frequency of the engine speed of 8 min– 1\n8.1.\nIf the average logging frequency of the engine speed of the originally recorded full load curve is smaller than 6, the conversion is performed by arithmetical averaging over intervals of ± 4 min – 1 of the given setpoint for the output data based on the full load curve input in originally recorded resolution. If the average logging frequency of the engine speed of the originally recorded full load curve is greater than or equal to 6, the conversion is performed by linear interpolation based on the full load curve input in originally recorded resolution.",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Substituted by Commission Regulation (EU) 2019/318 of 19 February 2019 amending Regulation (EU) 2017/2400 and Directive 2007/46/EC of the European Parliament and of the Council as regards the determination of the CO2 emissions and fuel consumption of heavy-duty vehicles (Text with EEA relevance)."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2017/2400/annex/V/appendix/8",
    "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."
}