{
  "url": "https://openlegislation.uk/eu-regulation-2017-2400/annex-VI/division-3/division-3.3/division-3.3.9",
  "json_url": "https://openlegislation.uk/eu-regulation-2017-2400/annex-VI/division-3/division-3.3/division-3.3.9.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/division/3/division/3.3/division/3.3.9",
  "kind": "division",
  "number": "3.3.9",
  "heading": "Measurement uncertainty",
  "text": "The part of the calculated total uncertainty UT,loss exceeding 5 % of Tloss or 1 Nm (ΔUT,loss ), whichever value of ΔUT,loss is smaller, shall be added to Tloss for the reported torque loss Tloss,rep . If UT,loss is smaller than 5 % of Tloss or 1 Nm, then Tloss,rep = Tloss .\nTloss,rep = Tloss + MAX (0, ΔUT,loss )\nΔUT,loss = MIN ((UT,loss – 5 % * Tloss ), (UT,loss – 1 Nm))\nFor each measurement set, the total uncertainty UT,loss of the torque loss shall be calculated based on the following parameters:\n(1)Temperature effect\n(2)Parasitic loads\n(3)Calibration error (incl. sensitivity tolerance, linearity, hysteresis and repeatability)\nThe total uncertainty of the torque loss (UT,loss ) is based on the uncertainties of the sensors at 95 % confidence level. The calculation shall be done as the square root of the sum of squares (‘Gaussian law of error propagation’).\nUT,loss=UT,in2+UT,outigear2\nUT,in∕out=2×u2TKC+u2TK0+u2cal+u2para\nuTKC=13×wtkcKref×ΔK×Tc\nuTK0=13×wtk0Kref×ΔK×Tn\nuCal=1×Wcalkcal×Tn\nupara=13×wpara×Tn\nwpara = senspara * ipara\nwhere:\nTloss Measured torque loss (uncorrected) [Nm]\nTloss,rep Reported torque loss (after uncertainty correction) [Nm]\nUT,loss Total expanded uncertainty of torque loss measurement at 95 % confidence level [Nm]\nuT,in/out Uncertainty of input/output torque loss measurement separately for input and output torque sensor[Nm]\nigear Gear ratio [-]\nuTKC Uncertainty by temperature influence on current torque signal [Nm]\nwtkc Temperature influence on current torque signal per Kref, declared by sensor manufacturer [%]\nuTK0 Uncertainty by temperature influence on zero torque signal (related to nominal torque) [Nm]\nwtk0 Temperature influence on zero torque signal per Kref (related to nominal torque), declared by sensor manufacturer [%]\nKref Reference temperature span for uTKC and uTK0, wtk0 and wtkc, declared by sensor manufacturer [K]\nΔKDifference in sensor temperature between calibration and measurement [K]. If the sensor temperature cannot be measured, a default value of ΔK = 15 K shall be used.\nTc Current/measured torque value at torque sensor [Nm]\nTn Nominal torque value of torque sensor [Nm]\nucal Uncertainty by torque sensor calibration [Nm]\nWcal Relative calibration uncertainty (related to nominal torque) [%]\nkcal calibration advancement factor (if declared by sensor manufacturer, otherwise = 1)\nupara Uncertainty by parasitic loads [Nm]\nwpara senspara * ipara\nRelative influence of forces and bending torques caused by misalignment [%]\nsenspara Maximum influence of parasitic loads for specific torque sensor declared by sensor manufacturer [%]; if no specific value for parasitic loads is declared by the sensor manufacturer, the value shall be set to 1,0 %\nipara Maximum influence of parasitic loads for specific torque sensor depending on test setup (A/B/C, as defined below).\nA) 10 % in case of bearings isolating the parasitic forces in front of and behind the sensor and a flexible coupling (or cardan shaft) installed functionally next to the sensor (downstream or upstream); furthermore, these bearings can be integrated in a driving/braking machine (e.g. electric machine) and/or in the transmission as long as the forces in the machine and/or transmission are isolated from the sensor. See figure 3.\nFigure 3\nTest setup A for Option 3\nB) 50 % in case of bearings isolating the parasitic forces in front of and behind the sensor and no flexible coupling installed functionally next to the sensor; furthermore, these bearings can be integrated in a driving/braking machine (e.g. electric machine) and/or in the transmission as long as the forces in the machine and/or transmission are isolated from the sensor. See figure 4.\nFigure 4\nTest setup B for Option 3\nC) 100 % for other setups",
  "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/3/division/3.3/division/3.3.9",
    "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."
}