{
  "url": "https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-3/division-3.9/division-3.9.2",
  "json_url": "https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-3/division-3.9/division-3.9.2.json",
  "legislation": "eur/2017/654",
  "legislation_title": "Commission Delegated Regulation (EU) 2017/654 of 19 December 2016 supplementing Regulation (EU) 2016/1628 of the European Parliament and of the Council with regard to technical and general requirements relating to emission limits and type-approval for internal combustion engines for non-road mobile machinery",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2017-654",
  "path": "annex/VII/division/3/division/3.9/division/3.9.2",
  "kind": "division",
  "number": "3.9.2",
  "heading": "PDP calibration calculations",
  "text": "For each restrictor position, the following values shall be calculated from the mean values determined in point 8.1.8.4 of Annex VI, as follows:\n(a) PDP volume pumped per revolution, V rev (m3/rev):\nV rev = ṅ ref – × R × T – in p – in × ƒ – n PDP\n(7-137)\nwhere:\nṅ – ref mean value of reference molar flow rate [mol/s]\nR molar gas constant [J/(mol · K)]\nT – in mean inlet temperature [K]\nP – in mean inlet pressure [Pa]\nƒ – n PDP mean rotational speed [rev/s]\n(b) PDP slip correction factor, K s [s/rev]:\nK s = 1 ƒ – n PDP × p – out − p – in p – out\n(7-138)\nWhere:\nṅ – ref mean reference molar flow rate [mol/s]\nT – in mean inlet temperature [K]\nP – in mean inlet pressure [Pa]\nP – out mean outlet pressure [Pa]\nƒ – n PDP mean PDP revolution speed [rev/s]\nR molar gas constant [J/(mol · K)]\n(c) A least-squares regression of PDP volume pumped per revolution, V rev, versus PDP slip correction factor, K s, shall be performed by calculating slope, a 1, and intercept, a 0, as described in Appendix 4;\n(d) The procedure in subparagraphs (a) to (c) of this point shall be repeated for every speed that PDP is operated;\n(e) Table 7.4 illustrates these calculations for different values of ƒ – n PDP :\nTable 7.4\nExample of PDP calibration data\nƒ – n PDP [rev/min]\nƒ – n PDP [rev/s]\na 1 [m3/min]\na 1 [m3/s]\na 0 [m3/rev]\n755,0\n12,58\n50,43\n0,8405\n0,056\n987,6\n16,46\n49,86\n0,831\n– 0,013\n1 254,5\n20,9\n48,54\n0,809\n0,028\n1 401,3\n23,355\n47,30\n0,7883\n– 0,061\n(f) For each speed at which the PDP is operated, the corresponding slope, a 1, and intercept, a 0, shall be used to calculate flow rate during emission testing as described in point 3.6.3(b).",
  "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/2017/654/annex/VII/division/3/division/3.9/division/3.9.2",
    "retrieved_at": "2026-11-01T14:45:01.864924+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."
}