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All proposals and comments are written in red
Present text(Draft Rev3)JASIC proposalJustification of JASIC proposalIssues in RED prepared by Japan. Result of the discussion during the 12th meeting of TF on RWS are shown in BLUE
1Scope
1.1This Regulation applies to:
1.1.1 PART I: Approval of audible reverse warning devices which are intended for fitting to motor vehicles of categories M2 (M > 3500 kg), N2, N3 and M3; (1)
1.1.2PART II: Approval of motor vehicles listed in 1.1.1. with regard to fitting of devices as specified under Part I automatically activated when reverse gear is selected and the propulsion system is on.
I.Part I. Audible reverse warning device
2Definitions
For the purpose of this Regulation:
2.1."Audible reverse warning device" means a device, emitting an acoustic signal to the outside of a vehicle which is intended to give audible reverse warning sound of the presence of a vehicle, with the primary purpose to fulfil the requirements of this Regulation;
2.1.1“Non-self-adjusting audible reverse warning device” means a device which gives an audible reverse warning sound independent of ambient noise levels
2.1.2“Self-adjusting audible reverse warning device” means a device which automatically adjusts its sound level, throughout a defined range, in order to maintain a sound level differential between the sound output of the device and the ambient noise measured by the device
2.1.3“Stepwise self-adjusting audible reverse warning device” means a device which automatically adjusts to 1 of 3 fixed sound level modes (low, normal, high), depending on the ambient noise measured by the device (TFRWS-08-03)
2.2.“Low Level” means the emitted sound level of the “Audible reverse warning device” which is sufficient for safety of vulnerable road users during quiet times and/or quiet areas.
2.3“Normal Level” means the emitted sound level of the “Audible reverse warning device” which is sufficient for safety of vulnerable road users during normal traffic hours and areas not covered by 2.2. and 2.4.
2.4.“High Level” means the emitted sound level of the “Audible reverse warning device” which is sufficient for safety of vulnerable road users during times and/or areas not covered by 2.2 and 2.3 (e.g. industrial or road construction sites
2.5."Type of audible reverse warning device" means audible reverse warning devices not differing essentially from each other with respect to such matters as:
2.5.1.Trade name or mark;2.5.1 Trade name or mark 2.5.2 Rated voltage 2.5.3 Sound level 2.5.4 Sound emitting count per minute 2.5.5 Method for adjusting sound level 2.5.6 Sound level modeAs audible reverse warning devices are different from horns (audible warning devices), the text should be reviewed based on the requirements for audible reverse warning devices. As to 2.5.5, there will be no change from the original draft in that the method for adjusting sound level changes depending on which of the systems in 2.1.1 to 2.1.3 applies. 2.5.6 refers to the sound level modes (Low/Normal/High) that the audible reverse warning device is provided with.
2.5.2.Principles of operation regarding sound pressure amplitude and frequency range;
2.5.2.1.Fixed arrangements;
2.5.2.2.Variable arrangements due background noise;
2.5.3.Type of electrical supply (direct or alternating current);
2.5.4.Rated voltage;
2.5.5.Shape or kind of sound outlet(s)
2.5.6.Rated sound frequency or frequencies;
2.6.“Background noise” or “Ambient noise” is any sound other than the sound of the reverse warning device, emitted by its acoustic signal. Its SPL is measured in dB(A) and the area considered around the vehicle is regarded as a homogeneous sound field with the same SPL
2.7.“Tonal Sound” means a sound which contains basically a single frequency, which is described as a pure tone sound commonly in the frequency range from 500 Hz to 4000 Hz“Tonal Sound” means a sound which contains basically a single frequency, which is described as a pure tone sound commonly in the frequency range from 500 Hz to 4000 Hz“Pure tone” is too narrow as a definition. Even tonal sounds have an overtone component frequency.CLEPA will provide a definition for the 13th meeting of TF on RWS
2.8.“Broadband Sound” means a sound which contains a large number of single frequency components, continuously distributed over a required frequency range covering at least 500 Hz to 4000 Hz (see §2.7)
2.9.“One-Third Octave Band Sound” means a sound which is defined as an acoustic signal with has its main energy and nearly constant power spectral density in 1 of 6 one-third octave frequency bands (Center frequency: 800, 1000, 1250, 1600, 2000 or 2500 Hz).One-Third Octave Band Sound” means a sound which is defined as an acoustic signal with has its main energy and nearly constant power spectral density in 1 of 6 one-third octave frequency bands (Center frequency: 800, 1000, 1250, 1600, 2000, 2500 or 3150 Hz).Added to increase the freedom of design, given that the human ear can hear sounds as high as 3150Hz.The Task Force agreed to the changes proposed by Japan
3Application for approval
3.1.The application for approval of a type of audible reverse warning device shall be submitted by its manufacturer or by his duly accredited representative.
3.2.It shall be accompanied by a duly filled technical information document, either in paper format in triplicate or alternatively upon agreement with the Type Approval Authority in electronic format. A model of the technical information document is shown in Annex 1A.
3.3.In addition, the application for approval shall be accompanied by two samples of the type of audible reverse warning device.
3.4.The Type Approval Authority shall verify the existence of satisfactory arrangements for ensuring effective control of the conformity of production before type approval is granted.
4Markings
4.1.Audible reverse warning devices excluding mounting accessories, shall bear:
4.1.1.The trade name or mark of the manufacturer and the model commercial name and/or number;
4.1.2.The approval mark according to paragraph 5.5.
4.2.The approval mark shall be shown on the audible reverse warning device according to paragraph 5.5. Each sample shall have a space of adequate dimensions for the approval mark; this space shall be indicated in the drawing.
4.3.All markings shall be clearly legible and indelible.
5Approval
5.1.If the two samples submitted for approval conform to the provisions of paragraph 6. below, approval for this type of audible reverse warning device shall be granted.
5.2.An approval number shall be assigned to each type approved. Its first two digits (at present 00 for the UN Regulation in its original form) shall indicate the series of amendments incorporating the most recent major technical amendments made to the UN Regulation at the time of issue of the approval. The same Contracting Party may not assign this number to another type of audible reverse warning device.
5.3.The same approval number may be assigned to types of audible reverse warning device differing only with respect to rated voltage, rated sound frequency or frequencies.The same approval number may be assigned to types of audible reverse warning device differing only with respect to rated voltage, rated sound frequency or frequencies.Unnecessary for audible reverse warning devices, because this is a provision specific to horn structures.The Task Force asked CLEPA to check this and come back with a proposal to be presented at the 13th meeting.
5.34. Communication on approval or refusal or extension or withdrawal of approval or production definitely discontinued of a type of audible reverse warning device pursuant to this UN Regulation shall be communicated to the Parties to the Agreement applying this UN Regulation by means of a form conforming to the model in Annex 1A to the UN Regulation.
5.45.On every audible reverse warning device which conforms to a type approved under this Regulation, there shall be affixed conspicuously, in an easily accessible place indicated on the approval form, an international approval mark comprising:
5.4.1.A circle containing the letter "E" followed by the distinguishing number of the country granting approval (2)
5.4.2.An approval number;
5.4.3.An additional symbol in the form of a figure in Roman numerals, showing the class to which the audible reverse warning device belongs.
5.56.Annex 2, Section I, to this Regulation gives an example of the arrangement of the approval mark.
5.67. The Type Approval Authority or its duly accredited technical service shall verify the arrangements of the marks for ensuring effective control of the conformity of production before type approval is granted.
6Specifications
6.1General specifications
6.1.1The “Audible reverse warning device” shall emit an acoustic signal, automatically activated, when reverse gear is selected and the propulsion system is on. The pattern of the acoustic signal shall include at least one silent part. The pattern of the acoustic signal, including silent parts, shall be repeatable with [24 to 120] cycles per minute. Remark: 03-02 Austria: 60 to 90 06-07: 24 to 100 Japan : 06-03 up to 120 For audible reverse warning devices supplied with alternating current, this requirement shall apply only at constant generator speed, within the range specified in paragraph 6.3.4.2. The type approval tests shall be carried out on two samples of each type submitted by the manufacturer for approval; both the samples shall be subjected to all the tests and must conform to the technical specifications laid down The “Audible reverse warning device” shall emit an acoustic signal, automatically activated, when reverse gear is selected and the propulsion system is on. The pattern of the acoustic signal shall include at least one silent part. The pattern of the acoustic signal, including silent parts, shall be repeatable with [24 to 120] cycles per minute. Remark: 03-02 Austria: 60 to 90 06-07: 24 to 100 Japan : 06-03 up to 120 For audible reverse warning devices supplied with alternating current, this requirement shall apply only at constant generator speed, within the range specified in paragraph 6.3.4.2. The type approval tests shall be carried out on two samples of each type submitted by the manufacturer for approval; both the samples shall be subjected to all the tests and must conform to the technical specifications laid down It is inappropriate to describe it as tested on the vehicle, because this section is a test on the component alone. The Task Force agreed to the changes, but this needs to be checked with the reuirements in paragraph 14.1.1.. The Secretary will present the result at the 13th meeting.
6.1.2The audible reverse warning device shall have acoustic characteristics and mechanical characteristics such that it passes, in the order indicated, the tests according to either paragraph 6.3. or 6.4. and 6.5.
6.1.3[Alternative sounds The manufacturer may define alternative sounds which can be selected by the driver; each of these sounds shall be in compliance and approved with the provisions in paragraphs 6.3. or 6.4. and 6.5.]
6.2Measuring instruments
6.2.1Acoustic measurements
6.2.1.1 When no general statement or conclusion can be made about conformance of the sound level meter model to the full specifications of IEC 61672-1:2013(3), the apparatus used for measuring the sound pressure level shall be a sound level meter or equivalent measurement system meeting the requirements of Class 1 instruments as described in IEC 61672-3:2013.(3) Measurements shall be carried out using the "fast" response of the acoustic measurement instrument and the "A" weighting curve as described in IEC 61672-1:2013(3). When using a system that includes a periodic monitoring of the A-weighted sound pressure level, a reading should be made at a time interval not greater than 30 ms. When measurements of the sound pressures in the one-third mid-band frequencies 2,000, 2,500, 3,150 and 4,000 Hz are carried out for one-third octaves, the instrumentation shall meet all requirements of IEC 61260-1-2014, class 1. The sound pressure level in the mid-band frequency 2,500 Hz shall be determined by adding the quadratic means of the sound pressures in the one-third mid-band frequencies 2,000, 2,500, 3,150 and 4,000 Hz. When measuring the rated sound frequency (or frequency range), the digital sound recording system shall have at least a 16 bit quantization. The average auto power spectrum shall be determined, using a Hanning window and at least 66.6 per cent overlap averages. The instruments shall be maintained and calibrated in accordance with the instructions of the instrument manufacturer. When no general statement or conclusion can be made about conformance of the sound level meter model to the full specifications of IEC 61672-1:2013(3), the apparatus used for measuring the sound pressure level shall be a sound level meter or equivalent measurement system meeting the requirements of Class 1 instruments as described in IEC 61672-3:2013.(3) Measurements shall be carried out using the "fast" response of the acoustic measurement instrument and the "A" weighting curve as described in IEC 61672-1:2013(3). When using a system that includes a periodic monitoring of the A-weighted sound pressure level, a reading should be made at a time interval not greater than 30 ms. When measurements of the sound pressures in the one-third mid-band frequencies 2,000, 2,500, 3,150 and 4,000 Hz are carried out for one-third octaves, the instrumentation shall meet all requirements of IEC 61260-1-2014, class 1. The sound pressure level in the mid-band frequency 2,500 Hz shall be determined by adding the quadratic means of the sound pressures in the one-third mid-band frequencies 2,000, 2,500, 3,150 and 4,000 Hz. When measuring the rated sound frequency (or frequency range), the digital sound recording system shall have at least a 16 bit quantization. The average auto power spectrum shall be determined, using a Hanning window and at least 66.6 per cent overlap averages. The instruments shall be maintained and calibrated in accordance with the instructions of the instrument manufacturer. One-third octave band analysis may not be able to distinguish between tonal sound and one-third octave band sound. As analyzing narrow band frequencies is much better and sufficient, one-third octave band analysis is unnecessary. The Task Force agreed to ask ISO WG42, what kind of instruments are needed (see also UN Regulation No. 138, ISO16254 & SAE 2889-1).
6.2.1.2.Calibration of the entire Acoustic Measurement System for a Measurement Session At the beginning and at the end of every measurement session the entire measurement system shall be checked by means of a sound calibrator that fulfils the requirements for sound calibrators of at least precision Class 1 according to IEC 60942:2003. Without any further adjustment the difference between the readings of two consecutive checks shall be less than or equal to 0.5 dB. If this value is exceeded, the results of the measurements obtained after the previous satisfactory check shall be discarded.
6.2.1.3.Compliance with requirements Compliance of the sound calibrator with the requirements of IEC 60942:2003 and compliance of the instrumentation system with the requirements of IEC 61672-3:2013(3) shall be confirmed by the existence of a valid certificate of compliance.
6.2.2Instrumentation for other measurements The voltage shall be measured with instrumentation having an accuracy of ±0.05 V or better. The resistance shall be measured with instrumentation having an accuracy of ±0.01 Ω or better. The distance shall be measured with instrumentation having an accuracy of ±5 mm or better. The time shall be measured with instrumentation having an accuracy of ±0.02 s or better. The meteorological instrumentation used to monitor the environmental conditions during the test shall include the following devices, which meet at least the following accuracy: (a) Temperature measuring device, ±1° C; (b) Wind speed-measuring device, ±1.0 m/s; (c) Barometric pressure measuring device, ±5 hPa; (d) A relative humidity measuring device, ±5 per cent.
6.3Measurement of the sound characteristics of the “Non-self-adjusting audible reverse warning device”
6.3.1The audible reverse warning device should, preferably, be tested in an anechoic chamber. Alternatively, it may be tested in a semi-anechoic chamber or in an open space. In these cases, precautions shall be taken to avoid reflections from the ground within the measuring area (for instance by erecting a set of absorbing screens). The wind speed shall be not more than 5 m/s. The ambient noise level shall be at least 10 dB lower than the sound pressure level to be measured. If the test facility shall be qualified as an anechoic environment it shall meet requirements of Annex 3.
6.3.2The audible reverse warning device to be tested and the microphone shall be placed at the same height. This height shall be 1.20 ± 0.05 m. In alternative, the audible reverse warning device to be tested and the microphone may be placed in another traverse line which complies with Annex 3 specification for anechoic environment. The microphone shall be so placed that its diaphragm is at a distance of 2.00 ± 0.05 m from the plane of the sound outlet of the audible reverse warning device. The microphone must be positioned facing the front surface emitting sound of the audible reverse warning device in the direction in which the maximum sound level can be measured. (see figures in Annex 4).The audible reverse warning device to be tested and the microphone shall be placed at the same height. This height shall be 1.20 ± 0.05 m. In alternative, the audible reverse warning device to be tested and the microphone may be placed in another traverse line which complies with Annex 3 specification for anechoic environment. The microphone shall be so placed that its diaphragm is at a distance of 2.00 1.00 ± 0.05 m from the plane of the sound outlet of the audible reverse warning device. The microphone must be positioned facing the front surface emitting sound of the audible reverse warning device in the direction in which the maximum sound level can be measured. (see figures in Annex 4).To reduce the cost of building a new anechoic chamber. Doesn't pose any problem as a measurement method if the regulatory values are converted to those of the sound level at 1 m.The Task Force asked CLEPA and GREWUS, if they can agree on this change. CLEPA and GREWUS agreed. All experts of the Task Force agreed too.
6.3.3The audible reverse warning device shall be mounted rigidly, by means of the equipment indicated by the manufacturer, on a support whose mass is at least ten times that of the audible reverse warning device under test and not less than 30 kg. In addition, arrangements must be made ensuring that reflections on the sides of the support and its own vibrations have no appreciable effect on the measuring results.The audible reverse warning device shall be mounted rigidly, by means of the equipment indicated by the manufacturer, on a support whose mass is at least ten times that of the audible reverse warning device under test and not less than 30 kg. In addition, arrangements must be made ensuring that reflections on the sides of the support and its own vibrations have no appreciable effect on the measuring results.Unnecessary because this is a driving environment specific to horns.The Task Force agreed only to delete the requirement on 30kg.
6.3.4The audible reverse warning device shall be supplied with current, as appropriate, at the following voltages:The audible reverse warning device shall be supplied with current, as appropriate, at the following voltages:CLEPA and GREWUS agreed to keep the paragraphs
6.3.4.1In the case of audible reverse warning device supplied with direct current, at a voltage measured at the terminal of the electric power source of 13/12 of the rated voltage;In the case of audible reverse warning device supplied with direct current, at a voltage measured at the terminal of the electric power source of 13/12 of the rated voltage;CLEPA and GREWUS agreed to keep the paragraphs
6.3.4.2In the case of audible reverse warning device supplied with alternating current, the current shall be supplied by an electric generator of the type normally used with this type of audible reverse warning device. The acoustic characteristics of the audible reverse warning device shall be recorded for electric generator speeds corresponding to 50 per cent, 75 per cent and 100 per cent of the maximum speed indicated by the manufacturer of the generator for continuous operation. During this test, no other electrical load shall be imposed on the electric generator. The endurance test described in paragraph 6.5. shall be carried out at a speed indicated by the manufacturer of the equipment and selected from the above range.In the case of audible reverse warning device supplied with alternating current, the current shall be supplied by an electric generator of the type normally used with this type of audible reverse warning device. The acoustic characteristics of the audible reverse warning device shall be recorded for electric generator speeds corresponding to 50 per cent, 75 per cent and 100 per cent of the maximum speed indicated by the manufacturer of the generator for continuous operation. During this test, no other electrical load shall be imposed on the electric generator. The endurance test described in paragraph 6.5. shall be carried out at a speed indicated by the manufacturer of the equipment and selected from the above range.The Task Force agreed to keep the paragraph. Japan will check at home, why the § should be deleted
6.3.5If a rectified current source is used for the test of an audible reverse warning device supplied with direct current, the alternating component of the voltage measured at its terminals, when the audible reverse warning devices are in operation, shall not be more than 0.1 V, peak to peak.If a rectified current source is used for the test of an audible reverse warning device supplied with direct current, the alternating component of the voltage measured at its terminals, when the audible reverse warning devices are in operation, shall not be more than 0.1 V, peak to peak.The Task Force agreed to keep the paragraph. Japan will check at home, why the § should be deleted
6.3.6For audible reverse warning device supplied with direct current, the resistance of the connecting leads, expressed in ohms, including terminals and contacts, shall be as close as possible to (0,10/12) x rated voltage in volt.For audible reverse warning device supplied with direct current, the resistance of the connecting leads, expressed in ohms, including terminals and contacts, shall be as close as possible to (0,10/12) x rated voltage in volt.The Task Force agreed to keep the paragraph. Japan will check at home, why the § should be deleted
6.3.7 Under the conditions set forth above, the sound-pressure level weighted in accordance with curve A shall not exceed the following values for “Non-self-adjusting audible reverse warning device” Table 1 Remark: See § 14.2.2.1. Proposal of Japan (TFRWS-07-04)[An audible reverse warning device shall have a normal mode that meets the sound limits of 58-78dBA. RWS may have low level,]The sound pressure level values should be calculated based on the sound pressure level values proposed for Part II. The Task Force agreed to discuss this paragraph together with the "Modes" and "Limit Values" after the Draft Proposal had ben finalized and the collected data had been analysed. Keep in mind, that the distance between the device and the microphone has been changed from 2 meter to 1 meter
6.3.8The specifications indicated above shall also be met by an audible reverse warning device subjected to the endurance test referred to in paragraph 6.5. below, with the supply voltage varying between 115 per cent and 95 per cent of its rated voltage for audible reverse warning device supplied with direct current or, for audible reverse warning device supplied with alternating current, between 50 per cent and 100 per cent of the maximum speed of the generator indicated by the manufacturer for continuous operation.The specifications indicated above shall also be met by an audible reverse warning device subjected to the endurance test referred to in paragraph 6.5. below, with the supply voltage varying between 115 per cent and 95 per cent of its rated voltage for audible reverse warning device supplied with direct current or, for audible reverse warning device supplied with alternating current, between 50 per cent and 100 per cent of the maximum speed of the generator indicated by the manufacturer for continuous operation.Unnecessary because this is a driving environment specific to horns.The Task Force agreed to keep the paragraph. Japan will check at home, why the § should be deleted
6.3.9The time lapse between the moment when the audible reverse warning device is actuated and the moment when the sound reaches the minimum value prescribed in Table 1 above shall not exceed two cycles measured at an ambient temperature of 20 + 5 ºC. The time lapse between the moment when the audible reverse warning device is actuated and the moment when the sound reaches the minimum value prescribed in Table 1 above shall not exceed two cycles measured at an ambient temperature of 20 + 5 5-40 ºC. To match the requirements of Part II tests.The Task Force agreed to change the temperature window to 5 - 40 ⁰C.
6.3.10To confirm the rated sound frequency (or frequency range) of audible reverse warning device the tests to measure this parameter using a spectrum analyzer with a frequency resolution of at least 1 Hz shall be conducted. The measured frequency (or frequency range) of the audible reverse warning device may differ from the rated sound frequency (or frequency range) no more than 10 per cent.
6.4Measurement of the sound characteristics of the “Self-adjusting audible reverse warning device” and of the “Stepwise-self-adjusting reverse warning device” (TFRWS-08-03)
6.4.1.The audible reverse warning device should, preferably, be tested in an anechoic chamber. Alternatively, it may be tested in a semi-anechoic chamber or in an open space.(5) In these cases, precautions shall be taken to avoid reflections from the ground within the measuring area (for instance by erecting a set of absorbing screens). The wind speed shall be not more than 5 m/s. The ambient noise level shall be at least 10 dB lower than the sound pressure level to be measured. If the test facility shall be qualified as an anechoic environment it shall meet requirements of Annex 3.
6.4.2. The audible reverse warning device to be tested, the loudspeaker and the microphone shall be placed at the same height. This height shall be 1.20 ± 0.05 m. In alternative, the audible reverse warning device to be tested, the loudspeaker and the microphone may be placed in another traverse line which complies with Annex 3 specification for anechoic environment. The microphone shall be so placed that its diaphragm is at a distance of 2.00 ±0.05 m from the plane of the sound outlet of the audible reverse warning device. The microphone must be positioned facing the front surface emitting sound of the audible reverse warning device in the direction in which the maximum sound level can be measured. The loudspeaker for ambient noise is placed at a distance of 2.00m from the audible reverse warning device and from the microphone, facing between the microphone and the audible reverse warning device. See figure. xxxxxxxx Figure xxxxx  New figures as proposed belongs to paragraph 4.8. ff (i) A background noise of +5 dB is unmeasurable (In measuring warning sounds, it is imperative that they be measured in an environment with a background noise of +10 dB or more. Otherwise, the measurement will negate the basic premise of sound measurement and will not produce accurate results.) (ii) Difficult to ensure long-term guarantee (Especially for feedback microphone). Justification should be provided for the above point. change distance to 1 m as in 6.3.3. keep 2 m distance to the bakground noise loudspeaker GREWUS agreed to conduct some verification tests and present the result at the 13th meeting.
• Remark: • During development we test at 2dB(A) intervals but this is very time consuming and not recommended for the standard • The reason for our set up not being an equilateral triangle is that this assumes the sound generating speaker produces sound evenly and that the sound level meter and the alarm are both measuring the same amount of noise. We have found this is not always the case, the speakers tend to be more directional than the microphones
6.4.3.The audible reverse warning device shall be mounted rigidly, by means of the equipment indicated by the manufacturer, on a support whose mass is at least ten times that of the audible reverse warning device under test and not less than 30 kg. In addition, arrangements must be made ensuring that reflections on the sides of the support and its own vibrations have no appreciable effect on the measuring results.The audible reverse warning device shall be mounted rigidly, by means of the equipment indicated by the manufacturer, on a support whose mass is at least ten times that of the audible reverse warning device under test and not less than 30 kg. In addition, arrangements must be made ensuring that reflections on the sides of the support and its own vibrations have no appreciable effect on the measuring results.As reverse warning devices are smaller and lighter than horns, no provision about weight is necessary. It is sufficient to fix them rigidly.The Task Force agreed to align this paragraph with paragraph 6.3.3. (see above) Japan will check at home, why the § should be deleted
6.4.4.The audible reverse warning device shall be supplied with current, as appropriate, at the following voltages:The audible reverse warning device shall be supplied with current, as appropriate, at the following rated voltages:.Measurements shall be made at the rated voltage.
6.4.4.1.In the case of audible reverse warning device supplied with direct current, at a voltage measured at the terminal of the electric power source of 13/12 of the rated voltage;In the case of audible reverse warning device supplied with direct current, at a voltage measured at the terminal of the electric power source of 13/12 of the rated voltage;Unnecessary because this is a driving environment specific to horns.The Task Force agreed to align this paragraph with paragraph 6.3.4.1. (see above). Japan will check at home, why the § should be deleted
6.4.4.2.In the case of audible reverse warning device supplied with alternating current, the current shall be supplied by an electric generator of the type normally used with this type of audible reverse warning device. The acoustic characteristics of the audible reverse warning device shall be recorded for electric generator speeds corresponding to 50 per cent, 75 per cent and 100 per cent of the maximum speed indicated by the manufacturer of the generator for continuous operation. During this test, no other electrical load shall be imposed on the electric generator. The endurance test described in paragraph 6.5. shall be carried out at a speed indicated by the manufacturer of the equipment and selected from the above range.In the case of audible reverse warning device supplied with alternating current, the current shall be supplied by an electric generator of the type normally used with this type of audible reverse warning device. The acoustic characteristics of the audible reverse warning device shall be recorded for electric generator speeds corresponding to 50 per cent, 75 per cent and 100 per cent of the maximum speed indicated by the manufacturer of the generator for continuous operation. During this test, no other electrical load shall be imposed on the electric generator. The endurance test described in paragraph 6.5. shall be carried out at a speed indicated by the manufacturer of the equipment and selected from the above range.The Task Force agreed to align this paragraph with paragraph 6.3.4.2. (see above). Japan will check at home, why the § should be deleted
6.4.5.If a rectified current source is used for the test of an audible reverse warning device supplied with direct current, the alternating component of the voltage measured at its terminals, when the audible reverse warning devices are in operation, shall not be more than 0.1 V, peak to peak.If a rectified current source is used for the test of an audible reverse warning device supplied with direct current, the alternating component of the voltage measured at its terminals, when the audible reverse warning devices are in operation, shall not be more than 0.1 V, peak to peak.The Task Force agreed to align this paragraph with paragraph 6.3.5. (see above). Japan will check at home, why the § should be deleted
6.4.6.For audible reverse warning device supplied with direct current, the resistance of the connecting leads, expressed in ohms, including terminals and contacts, shall be as close as possible to (0,10/12) x rated voltage in volt.For audible reverse warning device supplied with direct current, the resistance of the connecting leads, expressed in ohms, including terminals and contacts, shall be as close as possible to (0,10/12) x rated voltage in volt.The Task Force agreed to align this paragraph with paragraph 6.3.6. (see above). Japan will check at home, why the § should be deleted
6.4.7.Ambient noise emitted by the loudspeaker has to play pink noise at 4 different SPLs: • Low level: 45dBA • Normal Level 1: 55 dBA • Normal Level 2: 70 dBA • High Level: 80 dBA Pink noise is defined as random noise, where each octave carries an equal amount of noise energy throughout the frequency range of at least 200 Hz to 8000 Hz.  Definitions For measurement procedure one has to test the sound levels where the reverse warning sound has to be in a certain sound mode, so for the levels 45dBA, 55dBA, 70dBA and 80dBA.Justification should be provided for the values of Low level, Normal level 1, Normal level 2, and High level. Further, why are there two values for Normal level?
6.4.8Under the conditions set forth above, the sound-pressure level weighted in accordance with curve A shall not exceed the following values for “Self-adjusting audible reverse warning device”We are not sure if this is valid, because it is difficult to measure sounds at a background noise of +5 dB. Justification should be provided, including regulatory values (all numbers in square bracket, x, and, z).
(a) for “Tonal sound” [+ 5 dB(A) ± 1] in addition to the ambient sound in the range of [63 to 100] dB(A) • Low level: 45 dB(A) plus x dB(A) • Normal Level 1: 55 dB(A) plus x dB(A) • Normal Level 2: 70 dB(A) plus x dB(A) • High Level: 80 dB(A) plus x dB(A)
(b) for “Broadband sound” [+ 5 dB(A) ± 1] in addition to the ambient sound in the range of [60 to 95] dB(A) • Low level: 45 dB(A) plus y dB(A) • Normal Level 1: 55 dB(A) plus y dB(A) • Normal Level 2: 70 dB(A) plus y dB(A) • High Level: 80 dB(A) plus y dB(A)
(c) for “One-Third Octave Band Sound” [+ 1 dB(A) ± 5] in addition to the ambient sound in the range of [55 to 93] dB(A). • Low level: 45 dB(A) plus z dB(A) • Normal Level 1: 55 dB(A) plus z dB(A) • Normal Level 2: 70 dB(A) plus z dB(A) • High Level: 80 dB(A) plus z dB(A)
6.4.9.Under the conditions set forth above, the sound-pressure level weighted in accordance with curve A shall not exceed the following values for “Stepwise Self-adjusting audible reverse warning device”plus minus 3 is ok! but HM will check if we have to choose plus minus 4 dB
(a) for “Tonal sound” (see Table 2.a below)
(b) for “Broadband sound” (see Table 2.b below)
(c) for “One-Third Octave Band Sound” (see Table 2.c below)
Additions to the SPLs: • For special mounting positions the SPLs may be exceeded. Furthermore the test on the vehicle in [14.6] has to be passed • For the case that the 1/3-octave band of the signal adapts dynamically to the ambient noise, the SPLs can be 3dB below. • The required SPL has to be achieved after a maximum of two cycles of the warning sound For stepwise-self-adjusting reverse warning devices one can define SPLs of the ambient noise when the reverse warning device has to switch to a certain level and when it can switch to a certain level, for example:
Depending to the BGN different modes are possible. The system switches from Normal to the Low mode in case the BGN <= BGNL= 45dB(A) and switches back to Normal mode if the BGN reaches a SPL of BGNL+5dB(A) = 50dB(A). The system switches from Normal to the High mode in case the BGN >= BGNH= 75dB(A) and switches back to Normal mode if the BGN come back to a SPL of BGNH-5dB(A) = 70dB(A).
6.4.10.The specifications indicated above shall also be met by an audible reverse warning device subjected to the endurance test referred to in paragraph 6.5. below, with the supply voltage varying between 115 per cent and 95 per cent of its rated voltage for audible reverse warning device supplied with direct current or, for audible reverse warning device supplied with alternating current, between 50 per cent and 100 per cent of the maximum speed of the generator indicated by the manufacturer for continuous operation.The specifications indicated above shall also be met by an audible reverse warning device subjected to the endurance test referred to in paragraph 6.5. below, with the supply voltage varying between 115 per cent and 95 per cent of its rated voltage for audible reverse warning device supplied with direct current or, for audible reverse warning device supplied with alternating current, between 50 per cent and 100 per cent of the maximum speed of the generator indicated by the manufacturer for continuous operation.Unnecessary because this is a driving environment specific to horns.The Task Force asked CLEPA and GREWUS to check if this paragraph can be deleted. Both agreed to come back with an answer at the 13th meeting.
6.4.11.The time lapse between the moment when the audible reverse warning device is actuated and the moment when the sound reaches the minimum value prescribed in 6.4.7. above shall not exceed one cycle measured at an ambient temperature of 20 + 5 ºC.The time lapse between the moment when the audible reverse warning device is actuated and the moment when the sound reaches the minimum value prescribed in 6.4.7. above shall not exceed one cycle measured at an ambient temperature of 20 + 5 5-40 ºC.To match the requirements of Part II tests.The Task Force agreed to change the temperature window to 5 - 40 ⁰C.
6.4.12.To confirm the rated sound frequency (or frequency range) of audible reverse warning device the tests to measure this parameter using a spectrum analyzer with a frequency resolution of at least 1 Hz shall be conducted. The measured basic frequency (or frequency range) of the audible reverse warning device has to be within the range of 1k to 3.5k Hz. The frequency should be measured for 10 cycles and must not differ more than 10 per cent between each cycle. To measure the frequency (or frequency range) the loudspeaker for ambient noise simulation has to be switched off. (TFRWS-08-03)
6.5Endurance test
6.5.1.The audible reverse warning device shall be supplied with current at the rated voltage and with the connecting lead resistances specified in paragraphs 6.3.4. to 6.3.6. above, and operated respectively for a period of 24 hours.
6.5.2.If the test is made in an anechoic chamber, the chamber shall be large enough to ensure normal dispersal of the heat released by the audible reverse warning device during the test.
6.5.3.The ambient temperature in the testing room shall be between +15 and +30 ºC inclusively.The ambient temperature in the testing room shall be between +155 and +3040 ºC inclusively.To match the requirements of Part II tests.The the majority of the experts of the Task Force was of the opinion to keep the requirement "between + 15⁰C and + 30⁰C. This would be in line with the requirements in SAE J 994: 25⁰C ± 11⁰C => 14⁰C to 36⁰C The Task Force asked CLEPA Japan to check, why there is a need to change the temperature window. An answer is expected at the 13th meeting.
6.5.4.If, after the audible reverse warning device has been operated for half the number of times prescribed, the sound-level characteristics are no longer the same as before the test, the audible reverse warning device may be adjusted. After being operated the prescribed number of times, and after further adjustment if necessary, the audible reverse warning device must pass the test described in paragraph 6.3. above.If, after the audible reverse warning device has been operated for 12 hours half the number of times prescribed, the sound-level characteristics are no longer the same as before the test, the audible reverse warning device may be adjusted. After being operated 24 hours the prescribed number of times, and after further adjustment if necessary, the audible reverse warning device must pass the test described in paragraph 6.3. above.Needs to be corrected because it is not a number of times, but a prescribed period of time.The Task Force did not understand what the request "may be adjusted" mean. The Task Force asked Henry M if he could talk to Christopher. Maybe Christopher knows the history behind this.
7Modification and extension of approval of the type of the audible reverse warning device
7.1.Every modification of the type of the audible reverse warning device shall be notified to the Type Approval Authority which granted approval to that type of the audible reverse warning device. This Type Approval Authority may then:
7.1.1Either take the view that the modifications made are not likely to have any appreciable adverse effect;
7.1.2.Or call for a new report from the Technical Service responsible for the tests.
7.2.Communication on confirmation of the approval, with particulars of the modifications, or of refusal of approval shall be communicated to the Parties to the Agreement applying this Regulation, in accordance with the procedure indicated in paragraph 5.4. above.
7.3The Type Approval Authority issuing the extension of approval shall assign a series number to each communication form drawn up for such an extension.
8Conformity of production
The conformity of production procedures shall comply with those set out in the 1958 Agreement, Schedule 1 (E/ECE/TRANS/505/Rev.3) with the following requirements:
8.1.Audible reverse warning device approved under this Regulation shall be so manufactured as to conform to the type approved by meeting the requirements set forth in paragraph 6. above.
8.2.The authority which has granted type approval may at any time verify the conformity control methods applied in each production facility. The normal frequency of these verifications shall be once every two years.
9 Penalties for non-conformity of production
9.1The approval granted to a type of audible reverse warning device pursuant to this Regulation may be withdrawn if the conditions set forth in paragraph 8.1. are not complied with or if the audible reverse warning device fails to pass the checks referred to in paragraph 8.2. above.
9.2Should a Party to the Agreement applying this Regulation withdraw an approval which it has previously granted, it shall forthwith notify the other Contracting Parties applying this Regulation by means of a copy of the approval form bearing at the end in large letters the statement, signed and dated: "APPROVAL WITHDRAWN".
If the holder of an approval granted pursuant to this Regulation discontinues the production of the type of audible reverse warning device approved, he shall inform the authority which granted the approval. Upon receipt of the communication, this authority shall inform the other Parties to the Agreement applying this Regulation by means of a copy of the approval form bearing at the end in large letters the statement, signed and dated: "PRODUCTION DISCONTINUED".
II. Part II. Audible reverse warning signals of motor vehicles
11Definitions
For the purpose of this Regulation,
11.1."Approval of the motor vehicle" shall be understood to mean approval of a vehicle type with regard to its audible reverse warning signal;
11.2."Vehicle type" shall be understood to mean vehicles not essentially different from another with respect to such matters affecting their acoustic behaviour as:
11.2.1.The number and type(s) of audible reverse warning devices fitted on the vehicle;
11.2.2.The position of the audible reverse warning device(s) on the vehicle (e.g. position relative to the end of the vehicle, etc.);"Position" is too narrow meaning for this reguration. If mounting position will be a slightly changed, it will be a different difinition by this text. The sentence 11.2 is not being utilized. Appropriate texts should be considered. §11.2.2. and Annex 1B - Appendix 1 §1.1. 1.2. Question: Should "the Representative vehicle" be defined in this Regulation? The Secretary will check UN Regulation No. 51.03, No. 138 and No 28 and prepare a proposal for the 13th meeting.
11.2.4.A vehicle type in respect of this Regulation can also include vehicles from different vehicle classes (e.g. vehicles of category N2 and N3 within the same vehicle approval) if the vehicles are not essentially different in respect of their rearward acoustic behaviour.
11.2.3.The shape and materials of the bodywork at the rear of the vehicle which might affect the level of the sound emitted by the audible reverse warning device(s) and have a masking effect.
11.3. "Technically permissible maximum laden mass (M)" means the maximum mass allocated to a vehicle on the basis of its construction features and its design performances; the technically permissible laden mass of a trailer or of a semi-trailer includes the static mass transferred to the towing vehicle when coupled;
11.4.1"No-self-adjusting audible reverse warning device" as defined in 2.1.1.
11.4.2"Self-adjusting audible reverse warning device" as defined in 2.1.2.Definition is required.
11.4.3"Stepwise self-adjusting audible reverse warning device" as defined in 2.1.3.
11.5.“Background noise” or “Ambient noise” is any sound other than the sound of the reverse warning device. Its SPL is measured in dB(A) and the area considered around the vehicle is regarded as a homogeneous sound field with the same SPL.
11.6"Tonal sound" as defined in 2.7.
11.7"Broadband sound" as defined in 2.8.
11.8"One-third Octave Band Sound" as defined in 2.9.
11.5.“Low Level” as defined in 2.2.
11.6.“Normal Level” as defined in 2.3.
11.7.“High Level” as defined in 2.4.
11.8."Pause function" means a mechanism to halt temporarily the operation of a reverse warning device.
11.9. Symbols and Abbreviations Table x Remark: Maybe already needed for 6.4
12Application for approval
12.1.The application for approval of a vehicle type with regard to its audible reverse warning signals shall be submitted by the vehicle manufacturer or by his duly accredited representative;
12.2.It shall be accompanied by a duly filled technical information document, either in paper format in triplicate or alternatively upon agreement with the Type Approval Authority in electronic format. A model of the technical information document is shown in Annex 1B.
12.3.A vehicle representative of the vehicle type to be approved shall be submitted to the technical service responsible for the approval tests.
13Approval
13.1.If the vehicle type submitted for approval pursuant to this Regulation meets the requirements of paragraph 14. below, approval for this vehicle type shall be granted.
13.2.An approval number shall be assigned to each type approved. Its first two digits (at present 00 for the UN Regulation in its original form) shall indicate the series of amendments incorporating the most recent major technical amendments made to the UN Regulation at the time of issue of the approval. The same Contracting Party may not assign this number to another vehicle type.
13.3.Communication on approval or extension or withdrawal of approval or production definitely discontinued of a vehicle type pursuant to this Regulation shall be communicated to the Parties to the Agreement applying this Regulation by means of a form conforming to the model in Annex 1B to the UN Regulation.
13.4.On every vehicle which conforms to a vehicle type approved under this Regulation there shall be affixed conspicuously, in an easily accessible place indicated on the approval form, an international approval mark comprising:
13.4.1.A circle surrounding the letter "E" followed by the distinguishing number of the country which has granted approval ;(6)
13.4.2.The number of this Regulation, followed by the letter "R", a dash and the approval number placed to the right of the circle prescribed in paragraph 13.4.1.
13.5.If the vehicle conforms to a vehicle type approved, under one or more other Regulations annexed to the Agreement, in the country which has granted approval under this Regulation, the symbol prescribed in paragraph 13.4.2. need not be repeated; in such a case the UN Regulation and approval numbers and the additional symbols of all the UN Regulations under which approval has been granted in the country which has granted approval under this Regulation shall be placed in vertical columns to the right of the symbol prescribed in paragraph 13.4.
13.6.The approval mark must be clearly legible and indelible.
13.7.The approval mark shall be placed near the plate bearing the characteristics of the vehicle and may also be affixed to this plate.
13.8.Annex 2, Section II, to this Regulation gives an example of the arrangement of the approval mark.
13.9.The Type Approval Authority shall verify the existence of satisfactory arrangements for ensuring effective control of the conformity of production before type approval is granted.
14Specifications
14.1.General specifications
14.1.1The audible reverse warning device shall be so designed, constructed and assembled as to enable the vehicle, when reverse gear is selected and the propulsion system is on, despite the vibration to which it may be subjected, to comply with the provisions of this Regulation.
14.1.2The audible reverse warning device(s) and its (their) mounting elements to the vehicle shall be so designed, constructed and assembled as to be able to reasonably resist the corrosive phenomena to which it is exposed with regards to the conditions of use of the vehicle, including regional climate differences.
14.1.3[Alternative sounds The manufacturer may define alternative sounds which can be selected by the driver; each of these sounds shall be in compliance and approved with the provisions in paragraphs 6.3. or 6.4. and 6.5.]
14.2Specifications regarding sound levelsSee 6.1.3.
14.2.1Each sound made by the audible reverse warning device(s) fitted to the vehicle type submitted for approval shall be measured by the methods described in paragraph 14.3.; Each sound made by the audible reverse warning device(s) fitted to the vehicle type submitted for approval shall be measured by the methods described in paragraph 14.35.;
14.2.2Measured under the conditions specified in paragraphs 14.3. the sound-pressure level of the signal tested of theMeasured under the conditions specified in paragraphs 14.35. the sound-pressure level of the signal tested of the shall fulfill limit value described in paragraph 14.2.2.1 or 14.2.2.2:A typo.
14.2.2.1. “Non-self-adjusting audible reverse warning device” shall be: Table 4 [Proposed regulatory value by Japan (TFRWS-07-04) As to the regulatory value for the device alone in 6.3.7.1, if the regulatory value is needed, a proposal will be made once the value for the device onboard has been finalized.]The RWS shall have a normal level that meet the sound level from 58 to 78dB(A). RWS may have low level,The sentence was incomplete.Low mode: Justification about limit value is needed. High mode: Justification about limit value is needed.
14.2.2.2.“Self-adjusting audible reverse warning device” shall be at least (TFRWS-08-03): (a) for “Tonal sound” [+ 5 dB(A) ± 1] in addition to the ambient noise in the range of [45 to 90] dB(A) • Low level: 45 dB(A) plus x dB(A) • Normal Level 1: 55 dB(A) plus x dB(A) • Normal Level 2: 70 dB(A) plus x dB(A) • High Level: 80 dB(A) plus x dB(A) (b) for “Broadband sound” [+ 5 dB(A) ± 1] in addition to the ambient noise in the range of [40 to 90] dB(A) • Low level: 45 dB(A) plus y dB(A) • Normal Level 1: 55 dB(A) plus y dB(A) • Normal Level 2: 70 dB(A) plus y dB(A) • High Level: 80 dB(A) plus y dB(A) (c) for “One-Third Octave Band Sound” [+ 1 dB(A) ± 5] in addition to the ambient noise in the range of [40 to 90] dB(A). • Low level: 45 dB(A) plus z dB(A) • Normal Level 1: 55 dB(A) plus z dB(A) • Normal Level 2: 70 dB(A) plus z dB(A) • High Level: 80 dB(A) plus z dB(A) Normal level: TFRWS-03-04 Research on detectability and acceptability of reverse warning sound by evaluation testMeasurement method isn't defined. We are not sure if this is valid, because it is difficult to measure sounds at a background noise of +5 dB. Justification should be provided, including regulatory values (all numbers in square bracket, x, and, z). Range of ambient noise levels are different between part I and part II. Justification about the difference is needed. Part I: Tonal sound [63-100] Boad band sound [60-95] One-third octave band [55-93] Part II: Tonal sound [45-90] Broad band sound [40-90] One-third octave band [40-90] It isn't clear how to ajust ambient noise level.
14.2.3.“Stepwise self-adjusting audible reverse warning device” shall be at least (TFRWS-8-03): • Measure SPL of reverse warning device • Requirement: SPL of [Table 2.a, 2.b, 2.c of 6.4.9.] minus 11dB for a distance of 7 mMeasurement method isn't defined. Justification is needed about "minus 11dB".
14.3.Pause function The manufacturer may install a pause function to disable temporarily the acoustic reverse warning device when a vehicle of category M2 (M>3500 kg), N2, M3, N3, or O is equipped with a non-audible safety system, [such as a rearward facing camera system(7) ] [or a detection system(8) ], allowing the driver to check the hazard area behind the vehicle, including when towing vehicles, and it is ensured that such safety system(s) functions while reversing. Any other disabling function which does not satisfy the specifications below is prohibited.
14.3.1.When the towing vehicle(s) of category O is(are) not equipped with a non-audible safety system, [such as a rearward facing camera system(6)] [or a detection system(7)] and the driver is not able to see the rearward area behind the last vehicle of category O, the activation of the pause function shall be disabled (the acoustic reverse warning device shall still be active). Remark: See comments by EC (TFRWS-08-07) When the towing vehicle(s) of category O is(are) not equipped with a non-audible safety system, [such as a rearward facing camera system(67)] [or a detection system(78)] and the driver is not able to see the rearward area behind the last vehicle of category O, the activation of the pause function shall be disabled (the acoustic reverse warning device shall still be active). Remark: See comments by EC (TFRWS-08-07)
14.3.2.The pause function shall be located so that it is operable by the driver in a normal seating position.A typo.
14.3.3In the case when the pause function is activated, the suspension of reverse
14.3.4.The reverse warning device shall be reactivated to “Normal Level” when the vehicle is re-started following each vehicle turn-off.
14.3.5.Owner’s manual information If a pause function is installed, the manufacturer shall provide the owner with information (e.g. in the owner’s manual) as to the increased risks thus created: The pause function of the reverse warning sound device shall not be used unless for an obvious lack of necessity to emit sound for alert in the surrounding area and that it is certain that there are no pedestrians within a short distance.
14.4.The “Non-self-adjusting audible reverse warning device” shall automatically return to “Normal Level” when the vehicle is started following each vehicle turn-off.
14.5.Measurement on stationary vehicle of the sound characteristics of the “Non-self-adjusting audible reverse warning device”
14.5.1.The vehicle shall comply with the following specifications:
14.5.1.1.The audible reverse warning device(s) fitted on the vehicle shall be of a type approved under this Regulation (Part I);
14.5.1.2.The test voltage shall be as specified in paragraph 6.3.4. of this Regulation; In case of audible reverse warning device(s) supplied with direct current, the test voltage shall be supplied by either: (a) The vehicle battery only; or (b) The vehicle battery with the vehicle engine warmed-up and at idle; or (c) With an external power source supply connected to the audible reverse warning device(s) .
14.5.2.The sound pressure level and other measurements shall be made according to the conditions specified in paragraph 6.2. of this Regulation.
14.5.3.The A-weighted sound pressure level emitted by the audible reverse warning device(s) fitted on the vehicle shall be measured at a distance of 7.00 ± 0.10 m to the rear of the vehicle (see figures in Annex 5), which is being placed on an open site , on flat concrete or asphalt surface.
14.5.4.The microphone of the measuring instrument shall be placed approximately (± 0.10 m) in the mean longitudinal plane of the vehicle;TFRWS-11-03 At near of rear of the vehicle, sound field of tonal sound has a directionality based on its main frequency. 7m on 0˚ line is enough distance to evaluate reverse warning sound level correctly.
14.5.5.Background noise
14.5.5.1.Measurement criteria for A-weighted sound pressure level The “background noise” or “ambient noise” shall be measured for a duration of at least 10 seconds. A 10 second sample taken from these measurements shall be used to calculate the reported background noise, ensuring the 10 seconds sample selected is representative of the background noise in the absence of any transient disturbance. The measurements shall be made with the same microphones and microphone locations used during the test. When testing in an indoor facility, the noise emitted by other test facility equipment, without the vehicle installed or present, inclusive of the noise caused by air handling of the facility, shall be reported as the background noise. The recorded maximum A-weighted sound pressure level from both microphones during the 10 second sample shall be reported as the background noise, Lbgn, for both left and right microphones. For each 10 second sample at each microphone, the maximum to minimum range of the background noise, ∆Lbgn, p-p, shall be reported. The one-third octave frequency spectrum, corresponding to the reported maximum level of background noise in the microphone with the highest background level, shall be reported. As an aid for measurement and reporting of background noises see flowchart in Figure 1 of Appendix 6.
14.5.5.2. Vehicle A-weighted sound pressure level measurement correction criteria Depending on the level and the range of maximum to minimum value of the representative background noise A-weighted sound pressure level over a defined time period, the measured jth test result within a test condition, Ltest,j, shall be corrected according to the table below to obtain the background noise corrected level Ltestcorr,j. Except where noted, Ltestcorr,j = Ltest,j - Lcorr. Background noise corrections to measurements are only valid when the range of the maximum to minimum background noise A-weighted sound pressure levels are 2 dB(A) or less. In all cases where the range of the maximum to minimum background noise is greater than 2 dB(A), the maximum level of the background noise shall be 10 dB(A) or greater below the level of the measurement. When the maximum to minimum range of background noise is greater than 2 dB(A) and the level of the background noise is less than 10 dB(A) below the measurement, no valid measurement is possible.
If a sound peak obviously out of character with the general sound pressure level is observed, that measurement shall be discarded. As an aid for measurement correction criteria see flowchart in Figure 2 of Appendix 6.
14.5.6.The maximum sound-pressure level shall be sought within the range of 0.5 and 1.5 m above the ground, and the height, at which the maximum sound-pressure level was found has to be fixed for the purpose of taking the measurements prescribed below. The sound pressure level shall be measured at that fixed height for a duration of at least 3 seconds. The final result shall be the maximum A-weighted sound pressure level of the reading period, rounded mathematically to the nearest integer. 14.6. Measurement on stationary vehicle of sound characteristics of the “Self-adjusting audible reverse warning device” or of the “Stepwise Self-adjusting audible reverse warning device” (TFRWS-08-03)
14.6.1 to 14.6.y.Measurement procedure needs to be added (TFRWS-08-03): • 1/3 octave sound: microphone at 1m height, variation of height is not needed (like for tonal sounds) • Type Approval for device has to be available (to assure self-adjusting function) • Measure present background noise or ambient noise at microphone position at 7 m • open space see §6.3.1. and §6.4.1
15Modification and extension of approval of the vehicle type
15.1Every modification of the vehicle type shall be notified to the Type Approval Authority which granted approval to the vehicle type. This Type Approval Authority may then:
15.1.1Either take the view that the modifications made are not likely to have any appreciable adverse effect and that in any case the vehicle still meets the requirements; or
15.1.2Call for a new report from the Technical Service responsible for the tests.
15.2Communication on confirmation of approval with particulars of the modifications, or of refusal of approval shall be communicated to the Parties to the Agreement applying this Regulation, in accordance with the procedure indicated in paragraph 13.3. above.
15.3The Type Approval Authority issuing the extension of approval shall assign a series number to each communication form drawn up for such an extension.
16Conformity of production
The conformity of production procedures shall comply with those set out in the 1958 Agreement, Schedule 1 (ECE/TRANS/505/Rev.3) with the following requirements:
16.1A vehicle approved under this Regulation shall be so manufactured as to conform to the type approved by meeting the requirements set forth in paragraph 14. above.
16.2The Type Approval Authority which has granted type approval may at any time verify the conformity control methods applied in each production facility. The normal frequency of these verifications shall be once every two years.
17Penalties for non-conformity of production
17.1The approval granted to a vehicle type pursuant to this Regulation may be withdrawn if the conditions set forth in paragraph 16.1. above are not complied with, or if the vehicle fails to pass the checks referred to in paragraph 16.2. above.
17.2Should a Party to the Agreement applying this Regulation withdraw an approval which it has previously granted, it shall forthwith notify the other Contracting Parties applying this Regulation by means of a copy of the approval from bearing at the end in large letters the statement, signed and dated: "APPROVAL WITHDRAWN".
18Production definitively discontinued
18.1If the holder of the approval completely ceases to manufacture a vehicle type approved in accordance with this Regulation, he shall so inform the authority which granted the approval. Upon receiving the relevant communication that authority shall inform thereof the other Parties to the 1958 Agreement applying this Regulation by means of a communication form conforming to the model in Annex 1B to this Regulation.
19Names and addresses of Technical Services responsible for conducting approval tests and of Type Approval Authorities
The Contracting Parties to the 1958 Agreement applying this Regulation shall communicate to the United Nations Secretariat the names and addresses of the Technical Services responsible for conducting approval tests and of the Type Approval Authorities which grant approval and to which forms certifying approval or extension or refusal or withdrawal of approval, issued in other countries, are to be sent.
Annex 2Arrangement of the approval mark
The e-mark must be greater than 4 mm.
OthersSpace for printing is limited on some reverse warning devices.
Environmental provision for part II testAn environmental provision should be added mutatis mutandis in accordance with R138. R138 Annex3 2.1.2. Outdoor testing The test site shall be substantially level. The test track construction and surface shall meet the requirements of ISO 10844:2014. << It does not have to be an ISO 10844:2104 surface. Instead, in accordance with the modification to the standstill test under R138 (GRBP-71-28), the text should be as follows. >> The test area shall be either: a) ISO 10844:2014, or b) other dense asphalt, or c) dense concrete. and the rest will be as provided in Annex 3 2.1.2 to R138. Within a radius of 50 m around the centre of the track, the space shall be free of large reflecting objects such as fences, rocks, bridges or buildings. The test track and the surface of the site shall be dry and free from absorbing materials such as powdery snow, or loose debris. In the vicinity of the microphones, there shall be no obstacle that could influence the acoustic field and no person shall remain between the microphone and the noise source. The meter observer shall be positioned so as not to influence the meter reading. Microphones shall be located as specified in Figures [1] of the Appendix to this annex. 2.2. Meteorological conditions Metrological conditions are specified to provide a range of normal operating temperatures and to prevent abnormal readings due to extreme environmental conditions. A value representative of temperature, relative humidity, and barometric pressure shall be recorded during the measurement interval. The meteorological instrumentation shall deliver data representative for the test site and shall be positioned adjacent to the test area at a height representative of the height of the measuring microphone. The measurements shall be made when the ambient air temperature is within the range from 5 °C to 40 °C. The ambient temperature may of necessity be restricted to a narrower temperature range such that all key vehicle functionalities that can reduce vehicle noise emissions (e.g. start/stop, hybrid propulsion, battery propulsion, fuel-cell stack operation) are enabled according to manufacturer's specifications. The tests shall not be carried out if the wind speed, including gusts, at microphone height exceeds 5 m/s, during the measurement interval.Japan proposes that the regulation be structured like R138, where test methods are listed in the Annex and regulatory values and other information are prescribed in the main texts of the regulation, because it is easier to understand the regulation.
Should include the outdoor testing requirements stated in Annex 3 2.1.2 and 2.2 to R138.