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Regulation (EU) No 540/2014 of the European Parliament and of the Council of 16 April 2014 on the sound level of motor vehicles and of replacement silencing systems, and amending Directive 2007/46/EC and repealing Directive 70/157/EEC (Text with EEA relevance)
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Sound absorbing fibrous materials may be used in silencing systems, or components thereof, where either of the following conditions are fulfilled:
the exhaust gas is not in contact with the fibrous materials; or
the silencing system, or components thereof, are of the same design family as systems or components for which it has been proven, in the course of EU type-approval process in accordance with the requirements of this Regulation for another vehicle-type, that they are not subject to deterioration.
Where neither the condition in point (a) nor in point (b) of the first subparagraph is fulfilled, the complete silencing system, or components thereof, shall be submitted to a conventional conditioning using one of three installations and procedures described in points 1.1, 1.2 and 1.3.
For the purposes of point (b) of the first subparagraph, a group of silencing system, or components thereof, shall be considered as being of the same design family when all of the following characteristics are the same:
the presence of net gas flow of the exhaust gases through the absorbing fibrous material when in contact with that material;
the type of the fibres;
where applicable, binder material specifications;
average fibre dimensions;
minimum bulk material packing density in kg/m3;
maximum contact surface between the gas flow and the absorbing material.
five minutes at idling speed;
one-hour sequence under 1/4 load at 3/4 of rated maximum speed (S);
one-hour sequence under 1/2 load at 3/4 of rated maximum speed (S);
10-minute sequence under full load at 3/4 of rated maximum speed (S);
15-minute sequence under 1/2 load at rated maximum speed (S);
30-minute sequence under 1/4 load at rated maximum speed (S).
Total duration of the six sequences: three hours.
Each period shall comprise two sequenced sets of those conditions in consecutive order from (a) to (f).
In the second case, the engine shall be mounted on a dynamometer. The test apparatus, a detailed diagram of which is shown in Figure 1 of the Appendix to this Annex shall be fitted at the outlet of the silencing system. Any other apparatus providing equivalent results shall be acceptable.
If necessary, one cooling period shall be observed after each hour.
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