{
  "url": "https://openlegislation.uk/eu-regulation-2017-2400/annex-VI/appendix-9",
  "json_url": "https://openlegislation.uk/eu-regulation-2017-2400/annex-VI/appendix-9.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/appendix/9",
  "kind": "appendix",
  "number": "9",
  "heading": null,
  "text": "Generic model – torque converter\nGeneric torque converter model based on standard technology:\nFor the determination of the torque converter characteristics a generic torque converter model depending on specific engine characteristics may be applied.\nThe generic TC model is based on the following characteristic engine data:\nnrated Maximum engine speed at maximum power (determined from the engine full-load curve as calculated by the engine pre-processing tool) [rpm]\nTmax Maximum engine torque (determined from the engine full-load curve as calculated by the engine pre-processing tool) [Nm]\nThereby the generic TC characteristics are valid only for a combination of the TC with an engine sharing the same specific characteristic engine data.\nDescription of the four-point model for the torque capacity of the TC:\nGeneric torque capacity and generic torque ratio:\nFigure 1\nGeneric torque capacity\nFigure 2\nGeneric torque ratio\nwhere:\nTP1000 Pump reference torque; TP1000=TP×1000rpmnp2 [Nm]\nvSpeed ratio; v=n2n1 [-]\nμTorque ratio; μ=T2T1 [-]\nvs Speed ratio at overrun point; vs=n2n1 [-]\nFor TC with rotating housing (Trilock-Type) vs typically is 1. For other TC concepts, especially power split concepts, vs may have values different from 1.\nvc Speed ratio at coupling point; vc=n2n1 [-]\nv0 Stall point; v0 = 0 [rpm]\nvm Intermediate speed ratio; vm=n2n1 [-]\nThe model requires the following definitions for the calculation of the generic torque capacity:\nStall point:\nStall point at 70 % nominal engine speed.\nEngine torque in stall point at 80 % maximum engine torque.\nEngine/Pump reference torque in stall point:\nTP1000v0=Tmax×0,80×1000rpm0,70×nn2\nIntermediate point:\nIntermediate speed ratio vm = 0,6 * vs\nEngine/pump reference torque in intermediate point at 80 % of reference torque in stall point:\nTP1000vm=0,8×TP1000v0\nCoupling point:\nCoupling point at 90 % overrun conditions: vc = 0,90 * vs\nEngine/pump reference torque in clutch point at 50 % of reference torque in stall point:\nTP1000vc=0,5×TP1000v0\nOverrun point:\nReference torque at overrun conditions = vs :\nTP1000vs=0\nThe model requires the following definitions for the calculation of the generic torque ratio:\nStall point:\nTorque ratio at stall point v0 = vs = 0:\nμv0=1,8vs\nIntermediate point:\nLinear interpolation between stall point and coupling point\nCoupling point:\nTorque ratio at coupling point vc = 0,9 * vs :\nμvc=0,95vs\nOverrun point:\nTorque ratio at overrun conditions = vs :\nμvs=0,95vs\nEfficiency:\nn = μ * v\nLinear interpolation between the calculated specific points shall be used.",
  "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/appendix/9",
    "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."
}