{
  "url": "https://openlegislation.uk/eu-regulation-2017-2400/annex-VI/division-4",
  "json_url": "https://openlegislation.uk/eu-regulation-2017-2400/annex-VI/division-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/VI/division/4",
  "kind": "division",
  "number": "4",
  "heading": "Torque converter (TC)",
  "text": "The torque converter characteristics to be determined for the simulation tool input consist of Tpum 1000 (the reference torque at 1 000 rpm input speed) and μ (the torque ratio of the torque converter). Both are depending on the speed ratio v (= output (turbine) speed / input (pump) speed for the torque converter) of the torque converter.\nFor determination of the characteristics of the TC, the applicant for a certificate shall apply the following method, irrespective of the chosen option for the assessment of the transmission torque losses.\nTo take the two possible arrangements of the TC and the mechanical transmission parts into account, the following differentiation between case S and P shall apply:\nCase STC and mechanical transmission parts in serial arrangement\nCase PTC and mechanical transmission parts in parallel arrangement (power split installation)\nFor case S arrangements the TC characteristics may be evaluated either separate from the mechanical transmission or in combination with the mechanical transmission. For case P arrangements the evaluation of TC characteristic is only possible in combination with the mechanical transmission. However, in this case and for the hydromechanical gears subject to measurement the whole arrangement, torque converter and mechanical transmission, is considered as a TC with similar characteristic curves as a sole torque converter.\nFor the determination of the torque converter characteristics two measurement options may be applied:\n(i)Option A: measurement at constant input speed\n(ii)Option B: measurement at constant input torque according to SAE J643\nThe manufacturer may choose option A or B for case S and case P arrangements.\nFor the input to the simulation tool, the torque ratio μ and reference torque Tpum of the torque converter shall be measured for a range of v ≤ 0,95 (= vehicle propulsion mode). The range of v ≥ 1,00 (= vehicle coasting mode) may either be measured or covered by using the standard values of Table 1.\nIn case of measurements together with a mechanical transmission the overrun point may be different from v = 1,00 and therefor the range of measured speed ratios shall be adjusted accordingly.\nIn case of use of standard values the data on torque converter characteristics provided to the simulation tool shall only cover the range of v ≤ 0,95 (or the adjusted speed ratio). The simulation tool automatically adds the standard values for overrun conditions.\nTable 1\nDefault values for v ≥ 1,00\nv\nμ\nTpum 1000\n1,000\n1,0000\n0,00\n1,100\n0,9999\n– 40,34\n1,222\n0,9998\n– 80,34\n1,375\n0,9997\n– 136,11\n1,571\n0,9996\n– 216,52\n1,833\n0,9995\n– 335,19\n2,200\n0,9994\n– 528,77\n2,500\n0,9993\n– 721,00\n3,000\n0,9992\n– 1 122,0\n3,500\n0,9991\n– 1 648,0\n4,000\n0,9990\n– 2 326,0\n4,500\n0,9989\n– 3 182,0\n5,000\n0,9988\n– 4 242,0",
  "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/VI/division/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."
}