# 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 5.2.5.6: Test speed for constant-speed engines

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

The governors of constant-speed engines may not always maintain speed exactly constant. Typically speed can decrease (0,1 to 10) % below the speed at zero load, such that the minimum speed occurs near the engine's point of maximum power. The test speed for constant-speed engines may be commanded by using the governor installed on the engine or using a test-bed speed demand where this represents the engine governor.
Where the governor installed on the engine is used the 100 % speed shall be the engine governed speed as defined in Article 1(24).
Where a test-bed speed demand signal is used to simulate the governor, the 100 % speed at zero load shall be the no-load speed specified by the manufacturer for that governor setting and the 100 % speed at full load shall be the rated speed for that governor setting. Interpolation shall be used to determine the speed for the other test modes.
Where the governor has an isochronous operation setting, or the rated speed and no-load speed declared by the manufacturer differ by no more than 3 %, a single value declared by the manufacturer may be used for the 100 % speed at all load points.

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Source: https://www.legislation.gov.uk/eur/2017/654/annex/VI/division/5/division/5.2/division/5.2.5/division/5.2.5.6 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-654/annex-VI/division-5/division-5.2/division-5.2.5/division-5.2.5.6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.