# 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, Division 3.9.2: PDP calibration calculations

Extent: E+W+S+N.I.

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:
(a) PDP volume pumped per revolution, V rev (m3/rev):
V rev = ṅ ref – × R × T – in p – in × ƒ – n PDP
(7-137)
where:
ṅ – ref mean value of reference molar flow rate [mol/s]
R molar gas constant [J/(mol · K)]
T – in mean inlet temperature [K]
P – in mean inlet pressure [Pa]
ƒ – n PDP mean rotational speed [rev/s]
(b) PDP slip correction factor, K s [s/rev]:
K s = 1 ƒ – n PDP × p – out − p – in p – out
(7-138)
Where:
ṅ – ref mean reference molar flow rate [mol/s]
T – in mean inlet temperature [K]
P – in mean inlet pressure [Pa]
P – out mean outlet pressure [Pa]
ƒ – n PDP mean PDP revolution speed [rev/s]
R molar gas constant [J/(mol · K)]
(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;
(d) The procedure in subparagraphs (a) to (c) of this point shall be repeated for every speed that PDP is operated;
(e) Table 7.4 illustrates these calculations for different values of ƒ – n PDP :
Table 7.4
Example of PDP calibration data
ƒ – n PDP [rev/min]
ƒ – n PDP [rev/s]
a 1 [m3/min]
a 1 [m3/s]
a 0 [m3/rev]
755,0
12,58
50,43
0,8405
0,056
987,6
16,46
49,86
0,831
– 0,013
1 254,5
20,9
48,54
0,809
0,028
1 401,3
23,355
47,30
0,7883
– 0,061
(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).

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Source: https://www.legislation.gov.uk/eur/2017/654/annex/VII/division/3/division/3.9/division/3.9.2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-3/division-3.9/division-3.9.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.