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Revision of ECE R41 - PowerPoint PPT Presentation


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First analysis of the Informal GRB R41 TF database By Heinz Steven 23.10.2006. Revision of ECE R41. 44 vehicles 11 from Japan, 5 from ACEM, 11 from INDIA, 2 from USSMA, 15 from BASt No results from INDIA for current ECE R41, Detailed results (single measurements) for

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content and structure
44 vehicles

11 from Japan,

5 from ACEM,

11 from INDIA,

2 from USSMA,

15 from BASt

No results from INDIA for current ECE R41,

Detailed results (single measurements) for

ECE R41 from Japan and ACEM,

ISO 362-2 from Japan and ACEM,

ASEP from Japan, ACEM, INDIA, USSMA,

Roadside enforcement from Japan, ACEM

The following tables show the technical data of the vehicles.

Content and structure
slope of lmax versus engine speed
For 14 vehicles of the TUEV Nord motorcycle database (derived within UBA projects) and 9 vehicles of the Informal GRB R41 TF database the slopes of the linear regression lines of Lmax versus engine speed and versus normalised engine speed ((n – n_idle)/(s – n_idle)) were calculated for each side of the vehicle.

The results show an influence of rated engine speed as demonstrated in the following figures.

The slopes decrease with increasing rated_speed for the absolute engine speeds and increase with increasing rated speed for the normalised speeds.

Tolerance bands can be determined that could be used for ASEP requirements.

Slope of Lmax versus engine speed
example for asep
Within a project for the UBA TUEV Nord tested some motorcycles with original and replacement silencers.

Some of the replacement silencers showed noise emissions that were similar to the original equipment but could be easily modified so that the noise emission was increased between 7 and 13 dB(A). This modification makes the silencer illegal.

However, an advanced silencer whose noise emission up to engine speeds that are covered by ISO 362-2 are similar to the original equipment but switches to the illegal mode at higher engine speeds would no longer be illegal without ASEP

The following figure shows an example based on measurement results.

Example for ASEP