{
  "url": "https://openlegislation.uk/eu-decision-2020-174/annex/division-5",
  "json_url": "https://openlegislation.uk/eu-decision-2020-174/annex/division-5.json",
  "legislation": "eudn/2020/174",
  "legislation_title": "Commission Implementing Decision (EU) 2020/174 of 6 February 2020 on the approval of the technology used in 12 Volt efficient alternators for use in certain passenger cars and light commercial vehicles as an innovative technology pursuant to Regulation (EU) 2019/631 of the European Parliament and of the Council (Text with EEA relevance)",
  "legislation_url": "https://openlegislation.uk/eu-decision-2020-174",
  "path": "annex/division/5",
  "kind": "division",
  "number": "5",
  "heading": "MEASUREMENTS AND DETERMINATION OF THE EFFICIENCY",
  "text": "The efficiency of the 12 V efficient alternator shall be determined in accordance with ISO 8854:2012, with the exception of the elements specified in the present paragraph.\nThe measurements shall be conducted at different operating points i, as defined in Table 1. The alternator current intensity is defined as half of the rated current for all operating points. For each speed the voltage and the output current of the alternator are to be kept constant, the voltage at 14,3 V.\nTable 1\nOperating pointi\nHolding time[s]\nRotational frequencyni [min-1]\nFrequencyhi\n1\n1 200\n1 800\n0,25\n2\n1 200\n3 000\n0,40\n3\n600\n6 000\n0,25\n4\n300\n10 000\n0,10\nThe efficiency shall be calculated in accordance with Formula 1.\nAll efficiency measurements shall be performed consecutively at least five (5) times. The average of the measurements at each operating point ( ) has to be calculated.\nThe efficiency of the eco-innovative alternator (ηEI) shall be calculated in accordance with Formula 2\nThe efficient alternator leads to saved mechanical power under real-world conditions (ΔPmRW) and type approval conditions (ΔPmTA) as defined in Formula 3.\nFormula 3\nΔPm = ΔPmRW - ΔPmTA\nwhere the saved mechanical power under real-world conditions (ΔPmRW) is calculated in accordance with Formula 4 and the saved mechanical power under type-approval conditions (ΔPmTA) in accordance with Formula 5.\nWhere:\nPRW Power requirement under real-world conditions [W], which is 750W\nPTA Power requirement under type-approval conditions [W], which is 350W\nηB Efficiency of the baseline alternator [%], which is 67%",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "footnote",
      "label": "f1",
      "text": "ISO 8854:2012 Road vehicles – Alternators with regulators – Test methods and general requirements Reference number ISO 8854:2012, published on 1 June 2012."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eudn/2020/174/annex/division/5",
    "retrieved_at": "2026-11-01T15:12:23.501470+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."
}