Component [distance 2.00 m]
6.3.7.1. Automatically non-adjustable audible reverse warning device to ambient sound emission .
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Tonal Sound, Broadband Sound from 400 Hz to 10 kHz or 1/3 Octave Band Sound in between 400 Hz and 4 kHz |
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Min. Level |
Max. Level |
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dB(A) |
dB(A) |
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Low Level |
55 |
(55) |
68 |
(65) |
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Normal Level |
75 |
(70) |
88 |
(80) |
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High Level |
(85) |
(95) |
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6.3.7.2. Automatically adjustable audible reverse warning device to ambient sound emission to ambient sound emission shall be at least:
[+ 5 dB(A) ± 1 ] to the ambient sound emission between [ 50 to 95 ] dB(A)
Vehicle [distance 2.00 m]
14.2.2.1. Automatically non-adjustable audible reverse warning device to ambient sound emission shall be:
Vehicles shall automatically return to normal level in after restarting the vehicle . [FÖ1]
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Tonal Sound, Broadband Sound from 400 Hz to 10 kHz or 1/3 Octave Band Sound in between 400 Hz and 4 kHz |
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|
Min. Level |
Max. Level |
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|
|
dB(A) |
dB(A) |
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|
Low Level |
45 |
(45) |
58 |
(55) |
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Normal Level |
65 |
(60) |
78 |
(70) |
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High Level |
75 |
85 |
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14.2.2.2. Automatically adjustable audible reverse warning device to ambient sound emission shall be at least:
[+ 5 dB(A) ± 1 ] to the ambient sound emission between [ 40 to 85] dB(A)
3-Level Solution:
Component (2 m)
55 65 70 80 85 95 dB(A)
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Low Level Vehicle (7 m) |
Δ 5 dB(A) |
Normal Level Vehicle (7 m) |
Δ 5 dB(A) |
High Level Vehicle (7 m) |
45 55 60 70 75 85 dB(A)
Vehicle (7 m)
2-Level Solution:
Component (2 m)
55 68 75 88 dB(A)
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Low Level Vehicle (7 m) |
Δ 7 dB(A) |
Normal Level Vehicle (7 m) |
45 58 65 78 dB(A)
Vehicle (7 m)
[FÖ1] Justification : Driver is expected to make sound level adjustment with the responsibility of detecting and protecting the third party (pedestrians, children etc.) It is anticipated that this acceptance will not be applied in practice and that the sound level will probably remain at a constant level. To prevent audible reverse warning device at staying lowest level, it should return to normal level after restarting the vehicle.