{
  "url": "https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/1/division/division-8./division-8.3.",
  "json_url": "https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/1/division/division-8./division-8.3..json",
  "legislation": "eur/2017/1151",
  "legislation_title": "Commission Regulation (EU) 2017/1151 of 1 June 2017 supplementing Regulation (EC) No 715/2007 of the European Parliament and of the Council on type-approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and on access to vehicle repair and maintenance information, amending Directive 2007/46/EC of the European Parliament and of the Council, Commission Regulation (EC) No 692/2008 and Commission Regulation (EU) No 1230/2012 and repealing Commission Regulation (EC) No 692/2008 (Text with EEA relevance)",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2017-1151",
  "path": "annex/Sub/1/division/division/8./division/8.3.",
  "kind": "division",
  "number": "8.3",
  "heading": "Determination of the downscaling factor",
  "text": "The downscaling factor fdsc, is a function of the ratio rmax between the maximum required power of the cycle phases where the downscaling is to be applied and the rated power of the vehicle, Prated.\nThe maximum required power Preq,max,i (in kW) is related to a specific time i and the corresponding vehicle speed vi in the cycle trace and is calculated using the following equation:\nPreq,max,i=f0× vi+f1× v2i+f2× v3i+1,03× TM× vi× ai3600where:\nf0, f1, f2are the applicable road load coefficients, N, N/(km/h), and N/(km/h)2 respectively;\nTMis the applicable test mass, kg;\nviis the speed at time i, km/h;\naiis the acceleration at time i, km/h2.\nThe cycle time i at which maximum power or power values close to maximum power is required is second 764 for the Class 1 cycle, second 1 574 for the Class 2 cycle and second 1 566 for the Class 3 cycle.\nThe corresponding vehicle speed values, vi, and acceleration values, ai, are as follows:\nvi = 61,4 km/h, ai = 0,22 m/s2 for Class 1,\nvi = 109,9 km/h, ai = 0,36 m/s2 for Class 2,\nvi = 111,9 km/h, ai = 0,50 m/s2 for Class 3.\nrmax shall be calculated using the following equation:\nrmax=Preq,max,iPratedThe downscaling factor, fdsc, shall be calculated using the following equations:\nif rmax<r0, then fdsc=0\nand no downscaling shall be applied.\nIf rmax≥r0, then fdsc=a1× rmax+ b1\nThe calculation parameter/coefficients, r0, a1 and b1, are as follows:\nClass 1 r0 = 0,978, a1 = 0,680, b1 = – 0,665\nClass 2 r0 = 0,866, a1 = 0,606, b1 = – 0,525.\nClass 3 r0 = 0,867, a1 = 0,588 b1 = – 0,510.\nThe resulting fdsc is mathematically rounded to 3 places of decimal and is applied only if it exceeds 0,010.\nThe following data shall be included in all relevant test reports:\n(a)fdsc;\n(b)vmax;\n(c)distance driven, m.\nThe distance shall be calculated as the sum of vi in km/h divided by 3,6 over the whole cycle trace.",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Substituted by Commission Regulation (EU) 2018/1832 of 5 November 2018 amending Directive 2007/46/EC of the European Parliament and of the Council, Commission Regulation (EC) No 692/2008 and Commission Regulation (EU) 2017/1151 for the purpose of improving the emission type approval tests and procedures for light passenger and commercial vehicles, including those for in-service conformity and real-driving emissions and introducing devices for monitoring the consumption of fuel and electric energy (Text with EEA relevance)."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2017/1151/annex/Sub/1/division/division/8./division/8.3.",
    "retrieved_at": "2026-11-01T14:44:48.753743+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."
}