# 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 7.8.2.4: Validation criteria

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

RMC tests shall be validated using the regression analysis as described in points 7.8.3.3 and 7.8.3.5. The allowed RMC tolerances are given in the following Table 6.1. Note that the RMC tolerances are different from the NRTC tolerances of Table 6.2. When conducting testing of engines of reference power greater than 560 kW the regression line tolerances of Table 6.2 and the point deletion of Table 6.3 may be used.
Table 6.1
RMC Regression line tolerances
Speed
Torque
Power
Standard error of estimate (SEE) of y on x
maximum 1 % of rated speed
maximum 2 % of maximum engine torque
maximum 2 % of maximum engine power
Slope of the regression line, a 1
0,99 to 1,01
0,98 - 1,02
0,98 - 1,02
Coefficient of determination, r 2
minimum 0,990
minimum 0,950
minimum 0,950
y intercept of the regression line, a 0
± 1 % of rated speed
± 20 Nm or 2 % of maximum torque whichever is greater
± 4 kW or 2 % of maximum power whichever is greater
In case of running the RMC test not on a transient test bed, where the second by second speed and torque values are not available, the following validation criteria shall be used.
At each mode the requirements for the speed and torque tolerances are given in point 7.8.1.3. For the 20 s linear speed and linear torque transitions between the RMC steady-state test modes (point 7.4.1.2) the following tolerances for speed and load shall be applied for the ramp:
(a) the speed shall be held linear within ± 2 % of rated speed,
(b) the torque shall be held linear within ± 5 % of the maximum torque at rated speed.

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Source: https://www.legislation.gov.uk/eur/2017/654/annex/VI/division/7/division/7.8/division/7.8.2/division/7.8.2.4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-654/annex-VI/division-7/division-7.8/division-7.8.2/division-7.8.2.4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.