Proposal by the Informal Working Group (IWG) on Additional Sound Emission Provisions (ASEP) to introduce transitional provisions in line with the transitional provisions in Supplement 3 and to reintroduce a sentence deleted by mistake in Supplement 4 to the 03 series of amendments to UN Regulation No. 51.

• WP.29/2018/63 | UN R51: Proposal for Supplement 4 to the 03 series of amendments Available formats: pdf doc
• WP.29/2019/51 | UN R51: Proposal for a corrigendum to Supplement 4 to the 03 series of amendments Available formats: pdf doc

Proposal by the Informal Working Group (IWG) on Additional Sound Emission Provisions (ASEP) to correct a reference in Supplement 3 to the 03 series of amendments to UN R51.

• WP.29/2019/51 | UN R51: Proposal for a corrigendum to Supplement 4 to the 03 series of amendments Available formats: pdf doc

Proposal by the Informal Working Group on Additional Sound Emission Provisions (ASEP) to introduce transitional provisions for Supplements 4 and 5 to the 03 series of amendments to UN R51 (in line with the transitional provisions of Supplement 3), to correct a reference and to clarify the requirements for stationary sound.

• GRB/2018/10 | UN R51: Proposal for Supplement 5 to the 03 series of amendments Available formats: pdf doc

Proposal by the Informal Working Group on Additional Sound Emission Provisions (ASEP) to introduce a transitional provision in line with the transitional provisions of Supplement 3. The new transitional provision should be added to the text of draft Supplement 5 to the 03 series of amendments to UN R51 which was adopted by the Working Party on Noise at its sixty-eighth session (GRB/2018/10).

• GRB/2018/10 | UN R51: Proposal for Supplement 5 to the 03 series of amendments Available formats: pdf doc

Addendum to document GRB/2018/10 to introduce transitional provisions for submission to the WP.29 March 2019 session.

ASEP II informal group text to correct reference in Supplement 3 to the 03 series of amendments to UN Regulation No. 51. The proposed amendment is based on document ECE/TRANS/WP.29/2018/7, which was adopted by the Working Party 29 at its 174th session.

• WP.29/2018/7 | UN R51: Proposal for Supplement 3 to the 03 series of amendments Available formats: pdf doc

ASEP II informal group text to correct a mistake introduced in Supplement 4 to the 03 series of amendments to UN Regulation No. 51. The proposed amendment is based on document ECE/TRANS/WP.29/2018/63, which was adopted by the Working Party 29 at its 175th session.

• WP.29/2018/63 | UN R51: Proposal for Supplement 4 to the 03 series of amendments Available formats: pdf doc

ASEP II informal working group draft text to introduce transitional provisions for Supplements 4 and 5 in line with the transitional provisions of the Supplement 3 to the 03 series of amendments to UN Regulation No. 51, to correct a reference, and to clarify the requirements for stationary sound.

• ASEP II-09-07 | UN R51: Key elements of the ASEP II informal group work plan Available formats: doc

Proposal for Additional Real Driving Sound Emission provisions.

MS Outlook email message from the informal group secretary.

Presentation regarding the the national regulation in the Netherlands on delivery noise of trucks.

• ASEP II-11-00 | ASEP II informal group terms of reference Available formats: doc

• ASEP II-10-17 | Key elements of the update ASEP II informal group work plan Available formats: doc

Vehicle categories M₁, N₁, and L₃.

ASEP informal group report on the effort to provide clarification and guidance on the interpretation and application of paragraph 6.2.3. last sentence of UN R51.03 (“The sound emission of the vehicle under typical on-road driving conditions, which are different from those under which the type-approval test set out in Annex 3 and Annex 7 was carried out, shall not deviate from the test result in a significant manner.”)

ASEP informal group discussion paper on interpretation of the provision “The sound emission of the vehicle under typical on-road driving conditions, which are different from those under which the type-approval test set out in Annex 3 and Annex 7 was carried out, shall not deviate from the test result in a significant manner.”

• ASEP II-08-03/Rev.1 | UN R51: ASEP paragraph 6.2.3 clarification Available formats: doc

OICA discussion paper as further developed by the ASEP informal group on interpretation of the provision “The sound emission of the vehicle under typical on-road driving conditions, which are different from those under which the type-approval test set out in Annex 3 and Annex 7 was carried out, shall not deviate from the test result in a significant manner.”

• ASEP II-08-07 | UN R51: Discussion Paper on ASEP paragraph 6.2.3 Last Sentence Available formats: doc

Terms of reference as adopted by GRB and reproduced in Annex III of the GRB-62 session report.

Proposal to address comments on the adopted Supplement 4:

1. align the flowchart in the appendix to Annex 3, Figure 3c with the amendment to paragraph 3.1.2.1.4.1 (c) of Supplement 3 to the 03 series
2. amend Appendix to Annex 3, Table 1 to limit to pure electric vehicles the options to either use mechanical or electronic devices to control the gear shift or take measures to avoid accelerations greater than 2.0 m/s² (GRB/2018/2 and GRB-67-17)
3. under Annex 7, paragraph 5.2., align the principle of testing between automatic and manual transmission having more than 5 gears.

• GRB/2018/2 | Proposal for Supplement 4 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc
• GRB-67-17 | UN R51: Proposal for amendments to GRB/2018/2 Available formats: pdf doc
• WP.29/2018/63 | UN R51: Proposal for Supplement 4 to the 03 series of amendments Available formats: pdf doc
• GRB/2019/10 | UN R51: Proposal for Supplement 6 to the 03 series of amendments Available formats: pdf doc
• GRB/2019/11 | UN R51: Amendment to the proposal for Supplement 5 to the 03 series of amendments Available formats: pdf doc
• WP.29/2019/4 | UN R51: Proposal for Supplement 5 to the 03 series of amendments Available formats: pdf doc

Updated ASEP II informal group version.

Presentation on China vehicle noise and ASEP research, plans for implementation, and integration with UN R51.

Proposal to add indoor testing, including ISO 362-3, as an alternative to the type approval tests in Annex 3. In addition, UN R51 allows the use mechanical or electronic devices to control the gear shifting and measures to avoid accelerations greater than 2.0 m/s². However, the measures are not defined and the manufacturer or technical service is not obliged to document the methodology in the test report. This proposal introduces a table with examples for devices and measures for reference and would require documentation of methodology used.

• GRB/2018/2 | Proposal for Supplement 4 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc
• GRB/2018/3 | Proposal for Supplement 4 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc
• GRB-67-01/Rev.1 | UN R51: Proposal for additional amendments regarding indoor test methods Available formats: pdf doc
• GRB-67-17 | UN R51: Proposal for amendments to GRB/2018/2 Available formats: pdf doc
• GRB/2018/10 | UN R51: Proposal for Supplement 5 to the 03 series of amendments Available formats: pdf doc
• ASEP II-10-14/Rev.2 | UN R51: Proposal for Corrigendum 1 to Supplement 4 to the 03 series of amendments Available formats: doc
• GRB/2019/9 | UN R51: Proposal for Corrigendum 1 to Supplement 4 to the 03 series of amendments Available formats: pdf doc

Listing of key documents from the 5th ASEP II informal group session prepared by the group secretary.

Working draft text of the ASEP II informal group as of 20 March 2018.

Proposal to include the following transitional provision, “Until 18 months after the date of entry into force of the Supplement 3, it shall not apply to extensions of existing approvals, originally granted prior to the date of entry into force of Supplement 3.” This document was submitted after the WP.29 filing deadline in order to reflect recent developments. At its September 2017 session, GRB adopted a draft Supplement 3 to the 03 series of amendments to UN Regulation No. 51 and requested the secretariat to submit this proposal to the March 2018 session of WP.29. This was done in December 2017 (ECE/TRANS/WP.29/2018/7). At its next session in January 2018, GRB reviewed the proposal and decided to complement it with a new provision. The secretariat was requested to submit the modification as an addendum to the original WP.29 document (ECE/TRANS/WP.29/2018/7/Add.1).

• WP.29/2018/7 | UN R51: Proposal for Supplement 3 to the 03 series of amendments Available formats: pdf doc

Pursuant to the GRB-67 discussions, OICA proposes to restrict the application of the partial load driving to pure electric vehicles in order to facilitate adoption of document GRB/2018/2 while allowing the ASEP informal group to further consider the proposed formulas for the ASEP anchor point.

• GRB/2018/2 | Proposal for Supplement 4 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc
• WP.29/2018/63 | UN R51: Proposal for Supplement 4 to the 03 series of amendments Available formats: pdf doc
• GRB/2018/10 | UN R51: Proposal for Supplement 5 to the 03 series of amendments Available formats: pdf doc

Proposal of amendments for inclusion with the proposals on indoor testing in document GRB/2018/3.

• GRB/2018/3 | Proposal for Supplement 4 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc
• WP.29/2018/63 | UN R51: Proposal for Supplement 4 to the 03 series of amendments Available formats: pdf doc

ASEP II informal group proposal to correct documents WP.29/2018/7 and GRB-67-06 regarding Supplement 3 to the 03 series of amendments to Regulation No. 51.

• WP.29/2018/7 | UN R51: Proposal for Supplement 3 to the 03 series of amendments Available formats: pdf doc
• GRB-67-06 | UN R51: Proposal to corrigendum to Supplement 3 to the 03 series of amendments Available formats: pdf doc

ASEP II informal group proposal to GRB.

ASEP informal group draft proposal to amend the transitional provisions of the 03 series to address concerns over the handling of extensions. The proposal corrects one element in the broad update to UN R51 in document WP.29/2018/7 scheduled for consideration during the March 2018 WP.29 session.

• WP.29/2018/7 | UN R51: Proposal for Supplement 3 to the 03 series of amendments Available formats: pdf doc

Chair’s review of the informal group work leading up to the current (6th) session and tasks for the current session.

• GRB-67-14 | UN R51: Proposal for a corrigendum to the draft Supplement 3 to the 03 series Available formats: pdf doc

Extensive changes to UN R51 as developed mainly by the informal working group on Additional Sound Emission Provisions (ASEP II), but including further proposals submitted through GRB. All of these proposals were consolidated by GRB during its September 2017 session in Annex II to the session report. GRB intends to hold a final review of the changes, including whether they constitute a new series of amendments, during its January 2018 session, (i.e., prior to the March 2018 WP.29 session that will consider this document). The draft changes include proposals to

1. amend the scope to be design-neutral and reflect the driving situations covered by the Regulation;
2. highlight that ASEP apply to vehicles and their electric sound enhancement systems such as the Audible Vehicle Alert System (AVAS) and silencers equipped with an active cancelling system
3. update the “backfire” assessment procedure; and
4. clarify the gear ratio anchor point in Annex 7 as defined via Annex 3
5. Paragraph 1: The scope was originally drafted for the Annex 3 test which refers to normal urban driving. A proposed additional sentence covers the intention of Annex 7.
6. Paragraph 2.8.1.: Adopt the wording from standard ISO 362-1:2015 for clarity. If an electric motor is not operational during the type approval tests, then its power must not contribute to the calculation of the power to mass ratio (PMR).
7. Paragraph 2.24., table: Amendments regarding paragraph 2.2.7.4. of Annex 3 because paragraph 2.2.7.4. is new. Amendments also for line BB’ to reflect that the measurement will not end after line BB’. For the speeds vAA’, vBB’ and vPP’, a wrong reference coming from ISO was corrected.
8. Paragraph 2.27.: A new definition of “kickdown” was introduced since this term is used in this Regulation. With a large variety of products, it is unclear what “kickdown” exactly means. This definition is a design neutral approach and reflects the intention of Annex 3 and Annex 7.
9. Paragraph 2.28.: Prevention of downshift is a legal measure to ensure that the vehicle can be tested within the test conditions as specified by this Regulation.
10. Paragraph 3.3.: Deletion of meaningless sentence given the requirement that the vehicles have to be loaded in order to be able to achieve the urban driving conditions as described in paragraph 3.1.2.2. of Annex 3. The sentence has similarly already been deleted in Regulation (EU) No. 540/2014.
11. Paragraph 6.2.3.: Amend paragraph 11.6 to exempt vehicles with a serial hybrid drive train until July 2022 from ASEP since these vehicles do not have the internal combustion engine running within the control range of Annex 7 and therefore cannot yield valid test results.
12. Annex 1, Appendix 1: For the test method according to 3.1.2.1 the pre-acceleration length may differ per gear ratio. In this case, it is necessary to report the pre-acceleration length per gear ratio.
13. Annex 1, Appendix 2: Missing elements of the information document have been added, namely “0.2. type” and “3.2.6. pressure charger(s)”.
14. Annex 3, paragraph 2.1.: Lower temperatures will lead to slightly higher test results due to an increased tyre rolling sound. Thus, testing at lower temperatures will be a disadvantage for the manufacturer. If for practical reasons the manufacturer wishes to carry out tests at lower temperatures, this shall be accepted by the type approval authority.
15. Annex 3, paragraph 2.2.1.: For M1 and N1, the current provision has led to ambiguities about its meaning. The proposed new sentence clarifies the meaning. Further, the tolerances are broadened, as research shows, that the impact of the test mass can be neglected in a wide range. For M2, M3, N2 and N3, the current provision has led to ambiguities about its meaning. The proposed new sentence clarifies the meaning. If the test mass of the vehicle is equal to the target mass, the target mass shall be achieved with a tolerance of ±5 per cent according to equation (2) in paragraph 2.2.7.1. of Annex 3. Consequently this has to be valid also for the test mass mt. If the test mass of the vehicle is lower than the target mass according to equation (12) and (13) in paragraph 2.2.7.1. of Annex 3, the test mass shall be achieved with a tolerance of ±5 per cent. Concerning M2 and M3, for clarification and to avoid misunderstanding, the loading conditions for complete vehicles of category M2 (M > 3,500 kg) and M3 were aligned with the requirements for incomplete vehicles of category M2 (M > 3,500 kg) and M3. As a consequence, vehicles of category M2 (M ≤ 3,500 kg) have to be added to the table and their test mass requirement has to be aligned with those of vehicles of category M1 and N1.
16. Annex 3, paragraph 2.2.6.: add conditioning provisions for exhaust systems containing fibrous materials,
17. Annex 3, paragraph 2.2.7.1.: See the above justification for M2, M3, N2 and N3 in paragraph 2.2.1.
18. Annex 3, paragraph 2.2.7.4.: If a manufacturer does not produce vehicles with two axles only, he is not able to calculate the right test mass for his vehicles with more than two axles. For calculating the test mass, a vehicle with two axles has to be put on a scale to measure the unladen front axle load, mfa load unladen, and the unladen rear axle load, mra load unladen, for being able to calculate munladen as given in formula (3) of paragraph 2.2.7.1. of Annex 3. In addition, a new paragraph provides a procedure for calculating the test mass of a virtual vehicles with two axles, based on an existing vehicle with more than two axles, when a vehicle with two axles is physically not available to be put on a scale.
19. Annex 3, paragraph 3.1.2.1.: Proposal to extend the measurement to a position where misfiring is detectable. A redundant sentence is deleted per paragraph 2.2.4.
20. Annex 3, paragraph 3.1.2.1.4.1.(d): Clarify gear usage where one gear ratio is above 2 m/s² and the other below a_urban.
21. Annex 3, paragraph 3.1.2.1.4.1.: Clarify the proper setup for testing for vehicles with very short gear ratios.
22. Annex 3, paragraph 3.1.2.1.4.3.: Introduction of specifications for vehicles with only one gear ratio.
23. Annex 3, paragraph 3.1.2.1.5.: Simplify testing. With a fixed vehicle length, it is not necessary to adjust the test equipment (light barriers, pylons) for each vehicle.
24. Annex 3, paragraph 3.1.2.2.1..: Clarify the gear ratio selection procedures,
25. Annex 3, paragraph 3.2.3.: Reference correction
26. Annex 3, paragraph 3.2.5.3.: Reference correction
27. Annex 4, paragraph 1.: The performance of the fibrous material can be checked by completely removing the fibrous material. This reintroduces an option removed when Annex 5 of the 02 series of amendments was revised.
28. Annex 6, paragraph 2.1.: Proposal to simplify and clarify CoP. During the conformity of production procedures, neither the vehicle nor tyres will have a proper preconditioning. In many cases, the vehicles are foiled and parts may be missing as theft protection. It is very unlikely that the vehicles will have already the same performance as the type approval vehicle. This provision adopts the specifications from the revised ASEP provisions (Informal document GRB-65-26, Annex 7, para. 1). In addition, the range of masses was broadened in the same way as proposed for type approval.
29. Annex 6, paragraph 3.: Reference correction.

• GRB/2017/5 | Proposal for Supplement 3 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc
• GRB/2017/6 | Proposal for Supplement 3 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc
• GRB-66-13 | Proposal for amendments to ECE/TRANS/WP.29/GRB/2017/6 Available formats: pdf doc
• GRB-66-11 | Proposal for amendments to ECE/TRANS/WP.29/GRB/2017/6 Available formats: pdf doc
• GRB-66-06 | Proposal for amendments to ECE/TRANS/WP.29/GRB/2017/5 Available formats: pdf doc
• GRB-66-19 | Proposal for amendments to Regulation No.51.03 Available formats: pdf doc
• GRB-66-20 | Additional technical remarks and proposals for clarification on R51.03 Available formats: pdf xls
• ASEP II-06-08 | UN R51: Proposal for Supplement 3 to the 03 series of amendments Available formats: doc
• GRB-67-14 | UN R51: Proposal for a corrigendum to the draft Supplement 3 to the 03 series Available formats: pdf doc
• WP.29/2018/7/Add.1 | UN R51: Addendum to the proposal for Supplement 3 to the 03 series of amendments Available formats: pdf doc
• ASEP II-10-15/Rev.2 | UN R51: Proposal for Corrigendum 1 to Supplement 3 to the 03 series of amendments Available formats: doc

OICA presentation on modeling, including tire rolling noise and power train noise, of vehicle sound emissions and compliance with UN R51 requirements.

UN R51 allows the use mechanical or electronic devices to control the gear shifting and measures to avoid accelerations greater than 2.0 m/s². However, the measures are not defined and the manufacturer or technical service is not obliged to document the methodology in the test report. This proposal would introduce a table with examples for devices and measures for reference and would require documentation of methodology used.

• ASEP II-05-08 | UN R51: OICA proposal to clarify the use of alternative measurement devices Available formats: pdf
• GRB-67-17 | UN R51: Proposal for amendments to GRB/2018/2 Available formats: pdf doc
• WP.29/2018/63 | UN R51: Proposal for Supplement 4 to the 03 series of amendments Available formats: pdf doc
• GRB/2018/10 | UN R51: Proposal for Supplement 5 to the 03 series of amendments Available formats: pdf doc

Proposal including indoor testing as an alternative to type approval tests of Annex 3 to Regulation No. 51 including ISO 362-3.

• GRB/2017/8 | Proposal for Supplement 3 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc
• GRB-67-01/Rev.1 | UN R51: Proposal for additional amendments regarding indoor test methods Available formats: pdf doc
• WP.29/2018/63 | UN R51: Proposal for Supplement 4 to the 03 series of amendments Available formats: pdf doc

French ASEP test validation results and questions/difficulties encountered.

Japan presentation on tests conducted and questions raised.

UN R51 allows the use mechanical or electronic devices to control the gear shifting and measures to avoid accelerations greater than 2.0 m/s². However, the measures are not defined and the manufacturer or technical service is not obliged to document the methodology in the test report. This proposal would introduce a table with examples for devices and measures for reference and would require documentation of methodology used.

• GRB/2018/2 | Proposal for Supplement 4 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc

• GRB/2017/5 | Proposal for Supplement 3 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc
• GRB-66-14 | Status report to GRB of the ASEP II informal group Available formats: pdf ppt

Consolidation of draft amendments collected by OICA from various sources, including remarks of contracting parties during expert group meetings and meetings, and from discussions within the informal working group on ASEP. The document has been prepared to encourage discussion.

• WP.29/2018/7 | UN R51: Proposal for Supplement 3 to the 03 series of amendments Available formats: pdf doc

Proposal to

1. harmonize the definitions of v_BB’ in UN R51
2. clarify the scope of Annex 1, Appendix 2, paragraph 5 by substituting “Running” for “Suspension” to describe the system addressed
3. clarify the procedures for particular cases under Annex 3.

• WP.29/2018/7 | UN R51: Proposal for Supplement 3 to the 03 series of amendments Available formats: pdf doc

Proposal to increase the measurement precision by requiring measurement to the second decimal and to designate the line DD’ as the end point for measurements. The proposal also suggests editorial improvements and corrections.

• GRB/2017/6 | Proposal for Supplement 3 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc
• GRB-66-06 | Proposal for amendments to ECE/TRANS/WP.29/GRB/2017/5 Available formats: pdf doc
• WP.29/2018/7 | UN R51: Proposal for Supplement 3 to the 03 series of amendments Available formats: pdf doc

Proposal to delete the proposed amendment to paragraph 6.2.3. of UN R51 which would limit the scope of the additional sound emissions provisions (ASEP) to M₁ and N₁ vehicles equipped with an internal combustion engine operational within the control range of Annex 7. Switzerland submits that the limitation would release manufacturers from responsibility for vehicle sound behavior outside of ASEP in contradiction to the historical interpretation that manufacturers are responsible for ensuring reasonable vehicle sound levels under all conditions, not only within ASEP.

• GRB/2017/6 | Proposal for Supplement 3 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc
• WP.29/2018/7 | UN R51: Proposal for Supplement 3 to the 03 series of amendments Available formats: pdf doc

• ASEP II-05-04 | ASEP: Issues discussed during the 66th GRB session Available formats: pdf

Proposal to increase the precision of the lane of travel measurements by extending to two digits after the decimal point and to designate the line DD’ for the end of the measurements. The introduction of the line DD’ would impact the minimum length of the section after the line BB’ to be coated per ISO 10844.

• GRB/2017/5 | Proposal for Supplement 3 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc
• GRB-66-11 | Proposal for amendments to ECE/TRANS/WP.29/GRB/2017/6 Available formats: pdf doc
• WP.29/2018/7 | UN R51: Proposal for Supplement 3 to the 03 series of amendments Available formats: pdf doc

Password-protected file from ISO. Please contact the GRB secretariat for access.

ASEP data file for 5-1-2 noise limits as of 13 June 2017.

ASEP data file for L_urban noise limits as of 13 July 2017.

Measurement Setup Scheme for Stationary Sound Emission Test – Engine Proximity: Stationary Run-Up Measurement (SLOW run-up) from IDLE to Govern Engine Speed

1. Paragraph 1: The scope was originally drafted for the Annex 3 test which refers to normal urban driving. A proposed additional sentence covers the intention of Annex 7.
2. Paragraph 2.8.1.: Adopt the wording from standard ISO 362-1:2015 for clarity. If an electric motor is not operational during the type approval tests, then its power must not contribute to the calculation of the power to mass ratio (PMR).

3. Paragraph 2.24., table: Amendments regarding paragraph 2.2.7.4. of Annex 3 because paragraph 2.2.7.4. is new. Amendments also for line BB’ to reflect that the measurement will not end after line BB’. For the speeds vAA’, vBB’ and vPP’, a wrong reference coming from ISO was corrected.

4. Paragraph 2.27.: A new definition of “kickdown” was introduced since this term is used in this Regulation. With a large variety of products, it is unclear what “kickdown” exactly means. This definition is a design neutral approach and reflects the intention of Annex 3 and Annex 7.
5. Paragraph 2.28.: Prevention of downshift is a legal measure to ensure that the vehicle can be tested within the test conditions as specified by this Regulation.
6. Paragraph 3.3.: Deletion of meaningless sentence given the requirement that the vehicles have to be loaded in order to be able to achieve the urban driving conditions as described in paragraph 3.1.2.2. of Annex 3. The sentence has similarly already been deleted in Regulation (EU) No. 540/2014.
7. Paragraph 6.2.3.: The current specification requires a hybrid vehicle to be assessed according to the additional sound emission provisions (ASEP), even though such a vehicle does not have the internal combustion engine running within the control range of Annex 7. There will be no valid test result. Such vehicles should be exempted from ASEP.
8. Annex 1, Appendix 1: For the test method according to 3.1.2.1 the pre-acceleration length may differ per gear ratio. In this case, it is necessary to report the pre-acceleration length per gear ratio.
10. Annex 1, Appendix 2 : Missing elements of the information document have been added, namely “0.2. type” and “3.2.6. pressure charger(s)”.
11. Annex 3, paragraph 2.1.: Lower temperatures will lead to slightly higher test results due to an increased tyre rolling sound. Thus, testing at lower temperatures will be a disadvantage for the manufacturer. If for practical reasons the manufacturer wishes to carry out tests at lower temperatures, this shall be accepted by the type approval authority.
12. Annex 3, paragraph 2.2.1.: For M1 and N1, the current provision has led to ambiguities about its meaning. The proposed new sentence clarifies the meaning. Further, the tolerances are broadened, as research shows, that the impact of the test mass can be neglected in a wide range. For M2, M3, N2 and N3, the current provision has led to ambiguities about its meaning. The proposed new sentence clarifies the meaning. If the test mass of the vehicle is equal to the target mass, the target mass shall be achieved with a tolerance of ±5 per cent according to equation (2) in paragraph 2.2.7.1. of Annex 3. Consequently this has to be valid also for the test mass mt. If the test mass of the vehicle is lower than the target mass according to equation (12) and (13) in paragraph 2.2.7.1. of Annex 3, the test mass shall be achieved with a tolerance of ±5 per cent. Concerning M2 and M3, for clarification and to avoid misunderstanding, the loading conditions for complete vehicles of category M2 (M > 3,500 kg) and M3 were aligned with the requirements for incomplete vehicles of category M2 (M > 3,500 kg) and M3. As a consequence, vehicles of category M2 (M ≤ 3,500 kg) have to be added to the table and their test mass requirement has to be aligned with those of vehicles of category M1 and N1.
13. Annex 3, paragraph 2.2.7.1.: See the above justification for M2, M3, N2 and N3 in paragraph 2.2.1.
14. Annex 3, paragraph 2.2.7.4.: If a manufacturer does not produce vehicles with two axles only, he is not able to calculate the right test mass for his vehicles with more than two axles. For calculating the test mass, a vehicle with two axles has to be put on a scale to measure the unladen front axle load, mfa load unladen, and the unladen rear axle load, mra load unladen, for being able to calculate munladen as given in formula (3) of paragraph 2.2.7.1. of Annex 3. In addition, a new paragraph provides a procedure for calculating the test mass of a virtual vehicles with two axles, based on an existing vehicle with more than two axles, when a vehicle with two axles is physically not available to be put on a scale.
15. Annex 3, paragraph 3.1.2.1.: Proposal to extend the measurement to a position where misfiring is detectable. A redundant sentence is deleted per paragraph 2.2.4.
16. Annex 3, paragraph 1.1.2.1.4.1.(d): Clarify gear usage where one gear ratio is above 2 m/s² and the other below a_urban.
17. Annex 3, paragraph 1.1.2.1.4.1. (e): The suggested changes clarify the proper setup for testing for vehicles with very short gear ratios.
18. Annex 3, paragraph 3.1.2.1.4.3.: Introduction of specifications for vehicles with only one gear ratio.
19. Annex 3, paragraph 3.1.2.1.5. : Simplify testing. With a fixed vehicle length, it is not necessary to adjust the test equipment (light barriers, pylons) for each vehicle.
20. Annex 3, paragraph 3.2.3.: Reference correction
21. Annex 3, paragraph 3.2.5.3.: Reference correction
22. Annex 4, paragraph 1.: The performance of the fibrous material can be checked by completely removing the fibrous material. This reintroduces an option removed when Annex 5 of the 02 series of amendments was revised.


23. Annex 6, paragraph 2.1.: Proposal to simplify and clarify CoP. During the conformity of production procedures, neither the vehicle nor tyres will have a proper preconditioning. In many cases, the vehicles are foiled and parts may be missing as theft protection. It is very unlikely that the vehicles will have already the same performance as the type approval vehicle. This provision adopts the specifications from the revised ASEP provisions (Informal document GRB-65-26, Annex 7, para. 1). In addition, the range of masses was broadened in the same way as proposed for type approval.
24. Annex 6, paragraph 3.: Reference correction.

• GRB-66-11 | Proposal for amendments to ECE/TRANS/WP.29/GRB/2017/6 Available formats: pdf doc
• GRB-66-13 | Proposal for amendments to ECE/TRANS/WP.29/GRB/2017/6 Available formats: pdf doc
• WP.29/2018/7 | UN R51: Proposal for Supplement 3 to the 03 series of amendments Available formats: pdf doc

Proposal including indoor testing as an alternative to type approval tests of Annex 3 to Regulation No. 51 including ISO 362-3.

• GRB-65-04 | Proposal to introduce provisions for indoor testing under UN Regulation No. 51 Available formats: pdf doc
• GRB/2018/3 | Proposal for Supplement 4 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc

Modification of the proposal to enable indoor testing under UN R51 on vehicle noise.

• GRB-65-04 | Proposal to introduce provisions for indoor testing under UN Regulation No. 51 Available formats: pdf doc

Proposal to

1. amend the scope to be design-neutral and reflect the driving situations covered by the Regulation;
2. highlight that ASEP apply to vehicles and their electric sound enhancement systems such as the Audible Vehicle Alert System (AVAS) and silencers equipped with an active cancelling system
3. update the “backfire” assessment procedure; and
4. clarify the gear ratio anchor point in Annex 7 as defined via Annex 3

• GRB-66-06 | Proposal for amendments to ECE/TRANS/WP.29/GRB/2017/5 Available formats: pdf doc
• ASEP II-05-04 | ASEP: Issues discussed during the 66th GRB session Available formats: pdf
• WP.29/2018/7 | UN R51: Proposal for Supplement 3 to the 03 series of amendments Available formats: pdf doc

Proposal of extensive clarifications to UN R51 by the Informal Group on Additional Sound Emission Provisions (ASEP) in order to provide more consistent and unambiguous specifications for test procedures. Explanations of the proposed changes are provided in document GRB-65-25.

• GRB/2017/2 | Proposal for Supplement 2 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc
• GRB-65-26 | Proposal to amend the draft Supplement 2 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc
• GRB-65-25 | Presentation on the ASEP II informal group proposal for Supplement 2 to the 03 series of amendments to Regulation No. 51 Available formats: pdf ppt
• GRB-65-01 | Proposal for correction to ECE/TRANS/WP.29/2015/62 Available formats: pdf doc

Presentation concerning vehicle noise relationship to speed and acceleration and other factors

Presentation updated to include revisions to the working document GRB/2017/2 as agreed during the 2nd ASEP II informal group session to be presented during GRB-65 as an informal document amending the draft Supplement 2 to the 03 series of amendments to UN R51.

• GRB/2017/2 | Proposal for Supplement 2 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc

• GRB-65-22 | Labelling road surfaces Available formats: pdf
• GRB-67-19 | Labelling road surfaces Available formats: pdf ppt

Presentation on legal requirements (push) and public education/incentivization (pull) strategies to decrease road noise levels. The presentation especially addresses the Dutch interest in a road labeling system for rating road surface noise levels.

ASEP II informal group amendments to document GRB/2017/2. See document GRB-65-25 for additional explanations.

• GRB/2017/2 | Proposal for Supplement 2 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc
• GRB-65-25 | Presentation on the ASEP II informal group proposal for Supplement 2 to the 03 series of amendments to Regulation No. 51 Available formats: pdf ppt
• WP.29/2017/71 | Proposal for Supplement 2 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc

Explanation of the proposals contained in documents GRB/2017/2 and GRB-65-26.

• GRB/2017/2 | Proposal for Supplement 2 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc
• GRB-65-26 | Proposal to amend the draft Supplement 2 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc
• WP.29/2017/71 | Proposal for Supplement 2 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc

Updated version of document GRB/2017/2 pursuant to discussions during the 2nd ASEP II informal group session.

• GRB/2017/2 | Proposal for Supplement 2 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc

Discussion of current issues related to vehicle noise levels, especially given the availability of affordable electronic devices that enable car owners to artificially increase vehicle sound output.

• ASEP II-02-09 | Problems with Noise-Emissions of M1 and N1 Vehicles / NORESS and possible Solutions Available formats: pdf

Presentation of concerns and possible responses through GRB regarding vehicle noise, especially related to system tampering and vehicle modifications.

• ASEP II-02-08 | Revision of UN R51 ASEP: OICA input on consideration of future steps Available formats: pdf

OICA proposal to provide a clearer and more precise definition for “stable acceleration”. The definition introduced in document GRB/2017/02 is specified as "when the acceleration from line AA’ to PP’ has a low variation to the acceleration from line PP’ to BB’.” The term “low variation” is imprecise and so OICA proposes the wording “when the acceleration ratio a_{(PP’-BB’)}/a_{(AA’-BB’)} is lower than 1,2.”

• GRB/2017/2 | Proposal for Supplement 2 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc

Draft presentation on the amendments developed by the informal working group on Additional Sound Emission Provisions.

• GRB/2017/2 | Proposal for Supplement 2 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc

Proposal for clarifications, including the applicability of certain provisions, in Annex 3: Methods and instruments for measuring the sound made by motor vehicles.

Presentation for discussion of specific technical questions concerning the application of UN 51 test procedures.

Proposal including indoor testing as an alternative to type approval tests of Annex 3 to Regulation No. 51 in accordance with ISO 26101:2012 and ISO 362-3.

• ASEP II-03-18 | Revision of GRB-65-24 Available formats: ppt
• GRB/2017/8 | Proposal for Supplement 3 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc

Correction to paragraph 6.2.2. “Sound level limits” to add a reference specifically to paragraph 3.1 of Annex 3 in order to ensure interpretation of the sound limit values as application only “noise in motion” and not to “stationary noise”. This aligns the 02 and 03 series texts.

• WP.29/2015/62 | Proposals for the 03 series of amendments to Regulation No. 51 Available formats: pdf doc
• WP.29/2017/71 | Proposal for Supplement 2 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc

See document GRB-65-25 for detailed explanation.

• ASEP II-01-09 | Proposal for a new Supplement to the 03 series of amendments to Regulation No. 51 Available formats: doc
• ASEP II-02-02 | Presentation of Supplement 2 to the 03 series of amendments to UN Regulation No. 51 Available formats: ppt
• ASEP II-02-05 | ASEP II informal group revised proposal for Supplement 2 to the 03 series of amendments to Regulation No. 51 Available formats: doc
• ASEP II-02-06 | OICA presentation on stable acceleration variation Available formats: download
• ASEP II-02-07 | Revised presentation on GRB/2017/2 including ASEP II informal group updates Available formats: ppt
• GRB-65-25 | Presentation on the ASEP II informal group proposal for Supplement 2 to the 03 series of amendments to Regulation No. 51 Available formats: pdf ppt
• GRB-65-26 | Proposal to amend the draft Supplement 2 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc
• WP.29/2017/71 | Proposal for Supplement 2 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc

Draft proposal from the informal working group on Additional Sound Emission Provision to clarify the current text pursuant to the first group session. The intention is to submit a final document as a formal proposal to the 65th GRB session.

• GRB-64-04 | Proposals to clarify the provisions of Regulation No. 51, Revision 3, Annex 7 Available formats: pdf doc
• GRB/2017/2 | Proposal for Supplement 2 to the 03 series of amendments to Regulation No. 51 Available formats: pdf doc

ASEP flowchart pursuant to the first ASEP informal group session held during 7-8 November 2016.

ASEP informal group proposal to clarify UN R51 to address potential misinterpretation.

OICA comments on the ISO proposals to clarify the provisions of Regulation No. 51, Revision 3, Annex 7.

• GRB-64-04 | Proposals to clarify the provisions of Regulation No. 51, Revision 3, Annex 7 Available formats: pdf doc

Working draft for further refinements and clarifications to UN R51 under the auspices of the informal group on Additional Sound Emission Provisions.

copy of the ISO proposal (document GRB-64-04) to clarify the text in order to limit the potential for misinterpretation, presented at the September 2016 GRB session.

• GRB-64-04 | Proposals to clarify the provisions of Regulation No. 51, Revision 3, Annex 7 Available formats: pdf doc

Objectives and procedures for an informal working group to further develop Annex 7 and otherwise improve UN R51.