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TPMSTI-01-08

1 st session of the GRBP TF meeting on

Tyre Pressure Monitoring System and Tyre Installation (TPMSTI), 17 February 2020

 

ECONOMIC COMMISSION FOR EUROPE

INLAND TRANSPORT COMMITTEE

World Forum for Harmonization of Vehicle Regulations (WP.29)

Working Party on Noise and Tyres (GRBP)

Task Force on Tyre Pressure Monitoring System and Tyre Installation (TPMSTI)

 

Draft Report of the 1 st meeting of the Task Force TPMSTI 

February 17, 2020 starting at 09:00 ending at 17:00

DG GROW
BREY

Avenue d’Auderghem 45,
B-1040 Brussels/Belgium

 

 

 

 

Working Documents

* Documents not yet available

  1.  

Welcome and opening remarks

 

 

Mr. Andreas Vosinis (DG-GROW), the Chair of this TF, opened the 1 st meeting of TF on TPMSTI and welcomed all participants (Present 11, Skype 17).

 

  1.  

Introduction of participants and organizations

TPMSTI-01-09

 

All attendees agreed to share the information, which is available on the Attendance List, and to allow uploading of the list to the UNECE Website. Participants, who joined the meeting by Skype, are kindly asked to send their contact data to Mr. Andreas Vosinis. Contact data of 7 participants are still missing (see TPMSTI-01-09).

 

  1.  

Adoption of the agenda

TPMSTI -01-01

 

The Agenda was approved with the addition of the documents TPMSTI-01-02 and TPMSTI-01-03. The Filename of both documents were revised:

TPMSTI-01-02 (FR) Comments to GRBP-71-16

TPMSTI-01-03 (DE) Comments to GRBP-71-16

(see TPMSTI-01-01 Rev.1)

TPMSTI-01-01 Rev.1

  1.  

Scope of the TF & TF name

TPMSTI-01-04

 

The Chair presented his proposal for Guidelines for “GRBP Task Force Tyre Pressure Monitoring System and Tyre Installation (TPMSTI) under the 1958 Agreement” (see TPMSTI-01-04). This document was based on the Guidelines for the Task Force on Measurement Uncertainties (see TFMU-02-03 Rev.1). The group discussed the proposal and after adding the following wordings to 

B.3. The Task Force shall, where appropriate, develop amendments to these two Regulations or develop new Regulations for N2, N3, M2, M3, O3 and O4.

the Guidelines were adopted (see TPMSTI-01-04 Rev.1).

Reason: The members of the Group want to have the possibility to develop new Regulations, based on the existing ones, if they see that the implementations for vehicles of category N2, N3, M2, M3 and O become to complex.

 

TPMSTI-01-04 Rev.1

  1.  

Exchange of information on GRBP Documents

      (EC) – Proposal for amendments to UN R141

  • Comments from the 71 st GRBP
  • Review of studies and data collection
    • EC study on TPMS
    • Other?
  • Follow up of project and milestones

 

Key elements / Planning

 

GRB P - 71-15

TPMSTI-01-05

 

 

 

1 Scope regarding including all vehicle categories in UN Regulation No. 141

The Group will decide at a later stage whether to implement vehicles of category M 2 , M 3 , N 2 , N 3 , O 3 and O 4 into the existing UN Regulation No. 141 or to develop a new Regulation, based on No. 141, for vehicles of category M 2 , M 3 , N 2 , N 3 , O 3 and O 4 (see also Agenda item 4.)

 

1 Scope regarding “vehicles fitted with dual wheels on one axle”

The Group wanted to know, why vehicles fitted with dual wheels on one axle, were excluded in the Scope of UN Regulation No. 141 and why Regulation (EU) 2019/2144 (new GSR) are including them.

RDW will go back into the past and try to find out the reason for this decision.

DG-GROW pointed out that due to safety and environmental requirements vehicles of category N1 with dual wheels on one axle were included in the proposal, as for the other vehicles with twin wheels. This cannot be changed.

OICA explained that the indirect measuring TPMS, which is widely used by the vehicle manufacturer of N1 vehicles, is not capable to take care of dual wheels on one axle. A new tyre pressure monitoring system needs to be developed by these manufacturer. This takes time.

DG-GROW is of the opinion that this can be solved by additional Transitional Provisions.

OICA will discuss this item with N1 vehicle manufacturer and present the outcome of this discussion at the 2 nd meeting.

 

2 Definitions §2.4 “Twin wheel”

It is unclear whether the wording “Twin wheels” is the right one or not. In other Regulations one can find the wording “Twin tyres” or “Dual fitment” as an example.

ETRTO will go through the different Regulations and present a proposal for the wording at the 2 nd meeting.

 

5 Specifications and tests §5.2.1.

Most of the members of the Group were of the opinion that the minimum pressure of 250 kPa for vehicles of categories M 2 , M 3 , N 2 , N 3 , O 3 and O 4 is too low. During real driving under full load there is a great risk, that the tyre will get loose from the rim at a pressure of 250 kPa. Safety is not guaranteed at such low pressure.

RDW proposed to differentiate the minimum pressure depending on the tyre class C1, C2 or C3.

ETRTO presented TPMSTI-01-05, which was already presented to TRL 18 months ago. On slide 5 two warning levels for light and heavy duty vehicles are proposed, one for Maintenance and one for Alert. UN Regulation No. 141 is only dealing with the alert situation. Therefore only this part of the presentation should be taken into consideration.

Proposal:

Relative deflation in %, comparing to P warm is superior to the proposed threshold value

Or

P measured drops below the proposed absolute minimum value P min

Or/and

Deflation gradient

 

The thresholds are given on slide 6. CLEPA was of the opinion that the thresholds were too tough.

ETRTO and CLEPA will prepare a proposal for the 2 nd meeting. A new proposal for §5.2.1. needs also to take into consideration §5.3.1.

 

DG-GROW pointed out that if the minimum pressure level for vehicles of categories M1 and N1 should be revised too, this amendment needs to be prepared by ETRTO or CLEPA. The EC expert proposal for amendments to UN R141 does not propose to change the minimum pressure of “150 kPa” for M1 and N1.

The Group decided to put the last sentence of §5.2.1. and of §5.3.1. in square brackets.

 

5 Specifications and tests §5.3.1.

TRL is requested to check whether the wording “in any of the vehicle’s tyres” is the correct English wording. DG-GROW will inform TRL.

 

5 Specifications and tests §5.5.2. and §5.5.5.

The Group questioned if §5.5.2. is covering the condition when a vehicle of category N 3 is drawing more than one vehicle of category O.

TRL is requested to check the wording “ In the case of an N 2 or N 3 category vehicle drawing an O 3 or O 4 category vehicle” . DG-GROW will inform TRL.

 

FL pointed out that vehicles of category O do not send out optical warning signals. They are only sending out a signal. The ISO Standard ISO11992 is used to prescribe the communication between the drawing vehicle and a trailer. But this Standard is written in the first place for the communication of signals of electronic braking systems (EBS). If this Standard can be used for the communication for TPMS needs to be analyzed.

 

The Group is supporting this position. An interface between the drawing vehicle and the trailer is needed to secure the transfer of the TPMS data from the trailer to the drawing vehicle.

TRL is requested to check how the interface for the communication of data between these two different vehicles has to be defined. DG-GROW will inform TRL.

CLEPA will look into UN Regulation No. 13, to see if there is a fallback solution mentioned for vehicles with ABS.

CLEPA and OICA will discuss if there are other solutions available, where EBS is not required, and try to formulate a proposal for the 2 nd meeting.

 

The Group decided to put §5.5.2. and §5.5.5. into square brackets until a solution has been found which defines the interface.

 

General statement

In the proposed text sometimes numbers are used like “10 minutes” and sometimes words are used like “sixty minutes”.

The Secretary will take contact with the Secretary of GRBP to find out what commonly is used in Regulations.

 

1 2 Transitional Provisions

The Group decided to discuss the Transitional Provisions when the work on all other parts of the Regulation has been finalized.

For the time being §12 has been put into square brackets.

 

Annex 1 Communication §9.1. Mass of the vehicle when tested

The Group wondered if §9.1 means that only vehicles with a maximum number of 6 axles need to have TPMS. If this is not the case “etc” should be added after “sixth axle”.

TRL is asked for clarification. DG-GROW will inform TRL.

The Group agreed to add [etc] to §9.1.

 

When discussing the maximum numbers of axles, the Group raised the question, whether SPVs are included in the requirements of the new GSR or not.

Reason: Only four categories of SPVs are defined in the Consolidated Resolution on the Construction of Vehicles (R.E.3).

2.5.1. “Motor caravan”

2.5.2. “Armoured vehicle

2.5.3. “Ambulance”

2.5.4. “Hearse”

For all other SPVs a definition is missing in R.E.3.

DG-GROW will seek for clarification.

 

Annex 3 Tests for TPMS §1.4.2.(c) and (d)

The Group discussed whether the proposed speed range from 25 km/h to [90] km/h is suitable for vehicles of category M 2 , M 3 , N 2 , N 3 , O 3 and O 4 .

 

The Group came to the following conclusion

  • the load index is important
  • the tyre pressure under cold conditions (P cold ) is more important than under warm conditions (P warm )
  • the nominal tyre pressure should be used, because this one is independent of temperature and speed
  • the warm-up time for a truck trailer combination to reach P warm , as defined in Annex 3, is at least 2.5 hours (see also UN Regulation No.117, Annex 6,

 

Based on the experience of testing according to UN Regulation No.117 ETRTO will prepare a proposal for how to warm-up tyres for the 2 nd meeting.

The Group is of the opinion, that the actual test procedure in Annex 6 was developed for indirect measuring TPMS. Therefore it is not suitable for other TPMSs.

CLEPA and ETRTO will discuss if it is not better to propose a new test procedure, which is based on the nominal tyre pressure. A proposal is planned to be presented at the 2 nd meeting.

In parallel TRL is asked for clarification. DG-GROW will inform TRL.

 

As long as clarification is not given, the Group agreed to put the added text in Annex 6 for vehicles of category M 2 , M 3 , N 2 , N 3 , O 3 and O 4 in square brackets.

 

The Group wondered, if it is not a better solution to keep Annex 3 in its original form, valid only for vehicles of category M 1 and N 2 , and rename it Annex 3a and start to develop a new Annex 3b for vehicles of category M 2 , M 3 , N 2 , N 3 , O 3 and O 4 instead.

The Group asked all Experts to take this idea on board and discuss it at home.

 

The question about the test procedure needs to be solved before TRL starts its test program.

TRL is requested to make its test program public. DG-GROW will discuss with TRL the request of the Group.

DG-GROW suggests to organize a Skype meeting with TRL and the Group.

  • Preliminary dates: 2 nd , 3 rd , 4 th , 9 th or 10 th of March 2020

 

DG-GROW will inform the Group after having talked to TRL.

 

Open issues which were risen by CLEPA and OICA at the end of the meeting but not discussed due to time constrains:

 

  • Are the additional required symbols and tell-tales, to be introduced for vehicles of category M 2 , M 3 , N 2 , N 3 , O 3 and O 4 , in line with UN Regulation No. 121?
  • Even if the requirements for vehicles of category O 3 and O 4 are coming into force, a lot of trailers without any TPMS will be in traffic for a long time. How shall these trailers be connected to vehicles where TPMS is installed?
  • How shall vehicles of category N2 and N3, equipped with Central Tyre Inflation System (CTIS), be taken into consideration? The TPMS will always alert the driver when the CTIS is changing or adjusting the tyre pressure. Shall these vehicles be exempted?
  • According to the new GSR, Article 5, 2 “Tyre pressure monitoring systems shall be designed to avoid resetting or recalibration at a low tyre pressure” but no technical methodology is defined. Should this item not be solved in UN Regulation No. 141?

The open issues need to be discussed during the 2 nd meeting.

 

 

All comments or changes mentioned above are implemented in document  TPMSTI-01-06, which is based on GRBP-71-15.

(see markings in yellow )

All GRBP experts are asked to send their comments and proposals as agreed above at the latest one week before the 2 nd meeting of the Task Force TPMSTI ( 10 th of March 2020 ) to the Secretary and the Chair of the Task Force:

manfred.klopotek@scania.com

andreas.vosinis@ec.europa.eu

(see also TPMSTI-01-4 Rev.1 - Guidelines C.3.)

TPMSTI-01-06

 

 

  1.  

Exchange of information on GRBP Documents

      (EC) - Proposal for amendments to UN R142

  • Comments from the 71 st GRBP
  • Additional comments in writing on GRBP-71-16 from FR and DE (T Ü V SÜD)
  • Follow up of project and milestones

 

Key elements / Planning

GRBP-71-16

TPMSTI-01-02 (FR)

TPMSTI-01-03 (DE)

 

 

The Group discussed the comments by France (TPMSTI-01-02) and agreed to implement them into GRBP-71-16.

 

The Group discussed the comments by Germany (TPMSTI-01-03) and agreed to implement them partly into GRBP-71-16.

 

Reason: The Group is of the opinion that the changes, proposed by GOIE at the 71 st session of GRBP (see GRBP-71-26), are still under discussion and can therefore not be implemented in GRBP-71-16.

 

 

During the discussions of both documents the Group noticed that a few editorial changes have to be proposed.

 

All changes are implemented in the following document: TPMSTI-01-07, which is based on GRBP-71-16.

 

Changes proposed by France and agreed on are marked in green .

Changes proposed by Germany and agreed on are marked in yellow .

Changes proposed by the Group and agreed on are marked in blue .

 

All GRBP experts participating in this TF are asked to check carefully document TPMSTI-01-07 and send their comments at the latest one week before the 2 nd meeting of the Task Force TPMSTI ( 10 th of March 2020 ) to the Secretary and the Chair of the Task Force:

manfred.klopotek@scania.com

andreas.vosinis@ec.europa.eu

(see also TPMSTI-01-4 Rev.1 - Guidelines C.3.)

TPMSTI-01-07

  1.  

Next meeting(s)

 

  •   Official sessions of next TF T PMSTI in Brussels :

         2 nd   Meeting: 17-18/3/2020 CLEPA

         3 rd Meeting: 22-23/4/2020 EC DG-GROW

 

         4 th Meeting: 28-29/5/2020 (??) Preliminary date and place, tbc

 

  1.  

Adjourn

 

 

The Chair thanked all attendees, being present and joining by Skype, for fruitful and constructive discussions and closed the 1 st   meeting of TF on TPMSTI.

 

_____________________________

All documents will be available via the UNECE website for the Task Force on Tyre Pressure Monitoruing System and Tyre Installation ( TPMSTI ).