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GRRF Ad-Hoc Working Group

This document discusses the coupling force control in tractor/trailer braking systems, including proposed revisions to ECE Regulation 13. It also addresses the inclusion of endurance braking systems and provides compatibility diagrams for towing vehicles and trailers.

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GRRF Ad-Hoc Working Group

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  1. GRRF Ad-Hoc Working Group Tractor / Trailer Braking Compatibility 53 GRRF - February 2003

  2. Document: GRRF/2003/3 - Coupling Force Control Current text in ECE Regulation 13: Paragraph 5.2.1.28.1 Coupling force control shall only be permitted on the towing vehicle Paragraph 5.2.1.28.2 The action of the coupling force control shall be to reduce the difference between the dynamic braking rates of towing and towed vehicles.

  3. Document: GRRF/2003/3 - Coupling Force Control Conclusions of Industry Tests: • Some towing vehicles are being approved where the action of the coupling force control system has a braking bias to the trailer

  4. Document: GRRF/2003/3 - Coupling Force Control Proposed revisions to ECE Regulation 13: Paragraph 5.2.1.28.2 The action of the coupling force control shall be to reduce the difference between the dynamic braking rates of towing and towed vehicles. The operation of the coupling force control shall be checked at the time of type approval. The method by which this check is carried out shall be agreed between the vehicle manufacturer and the technical service, with the method of assessment and results being appended to the type approval report.

  5. Document: GRRF/2003/3 - Coupling Force Control Current text in ECE Regulation 13: Paragraph 5.2.1.28.6 A coupling force control system shall only control the coupling forces generated by the service braking system of the motor vehicle and the trailer, excluding endurance braking systems. Coupling forces resulting from the performance of endurance braking systems shall not be compensated by the service braking system. It is considered that endurance braking systems are not part of the service braking systems.

  6. Document: GRRF/2003/3 - Coupling Force Control Conclusions of Industry Tests: • Some towing vehicles are being approved with endurance braking systems where the force generated by the endurance brake is being included as part of the service braking system.

  7. A coupling force control system shall only control the coupling forces generated by the service braking system of the motor vehicle and the trailer. excluding endurance braking systems. Document: GRRF/2003/3 - Coupling Force Control Proposed revisions to ECE Regulation 13: Paragraph 5.2.1.28.6 Coupling forces resulting from the performance of endurance braking systems shall not be compensated by the service braking system of either the motor vehicle or trailer. It is considered that endurance braking systems are not part of the service braking systems.

  8. Official Proposed Document: GRRF/2003/5 - Compatibility Diagrams Annex 10 - Diagram 2: Towing Vehicles and Trailers

  9. Official Proposed Document: GRRF/2003/5 - Compatibility Diagrams Annex 10 - Diagram 3: Tractors for Semi-Trailers

  10. Official Proposed Document: GRRF/2003/5 - Compatibility Diagrams Annex 10 - Diagram 4A: Semi-Trailers

  11. Document: GRRF/2003/4 Proposed revisions to ECE Regulation 13 - Annex 10: Paragraph 1.1 - - - - as defined in Annex 13 to this Regulation shall meet all the requirements of this annex, If a special device is used, this must act automatically */. However, vehicles - - - */ In the case of trailers equipped with electrically controlled brake force distribution the requirements of this annex shall only apply when the trailer is electrically connected to a towing vehicle by the ISO7638 connector

  12. Document: GRRF/2003/4 Current text in Annex 10: Paragraph 1.2 The requirements relating to the diagrams specified in paragraphs 3.1.5., 3.1.6., 4.1., 5.1. and 5.2. of this Annex, are valid both for power driven vehicles with a pneumatic control line according to paragraph 5.1.3.1.1. of this Regulation and for power driven vehicles with an electric control line according to paragraph 5.1.3.1.3. of this Regulation. In both cases, the reference value - - - - -

  13. The requirements relating to the diagrams specified in paragraphs 3.1.5., 3.1.6., 4.1., 5.1. and 5.2. of this Annex, are valid both for power driven vehicles with a pneumatic control line according to paragraph 5.1.3.1.1. of this Regulation and for power driven vehicles with an electric control line according to paragraph 5.1.3.1.3. of this Regulation. In both cases, the reference value - - - - - Document: GRRF/2003/4 Proposed revisions to Annex 10: Paragraph 1.2 Amend ISO11992 reference.

  14. Document: GRRF/2003/4 Current requirements of Annex 10 and Annex 13: Annex 10: Requires vehicles to fulfil the prescribed laden and unladen compatibility requirements. Annex 13, paragraph 1.1.: - - - anti-lock systems. In addition, power driven vehicles which are authorised to tow a trailer and trailers equipped with compressed air braking systems. Shall, when the vehicles are laden, meet the requirements for compatibility set out in Annex 10 to this Regulation.

  15. Document: GRRF/2003/4 Interpretation of existing Annex 10 requirements: Laden: vehicle performance must be within the shaded area. For all states of load except laden: No requirements exist

  16. Document: GRRF/2003/4 Proposed revisions to Annex 13: Paragraph 1.1 - - - - for compatibility set out in Annex 10. However, for all load conditions, a braking rate shall be developed between a pressure of 0.2 and 1.0bar or equivalent digital demand value at the coupling head of the control line(s).

  17. 53 GRRF Informal Document No.5: Proposed addition to Annex 10: Paragraph 1.3 At the time of type approval it shall be checked that the development of braking on an axle of each independent axle group */ shall be within the following pressure ranges: */ An axle group is where a number of axles have a maximum axle spread of 2m.

  18. 53 GRRF Informal Document No.5: Annex 10 1.3. Validation of the development of braking force: Paragraph 1.3.1. Laden vehicles: At least one axle shall commence to develop a braking force when the pressure at the coupling head is within the pressure range 0.2 to 1.0bar. At least one axle of any other axle group shall commence to develop a braking force when the pressure at the coupling head is [<1.2bar]. Unladen vehicles: At least one axle shall commence to develop a braking force when the pressure at the coupling head is within the pressure range 0.2 to 1.0bar.

  19. 53 GRRF Informal Document No.5: Annex 10 1.3. Validation of the development of braking force: Paragraph 1.3.1.1. With the wheel(s) raised of the axle(s) raised off the ground and free to rotate, apply an increasing brake demand and measure the coupling head pressure corresponding to when the wheel(s) can no longer be rotated by hand. This condition is defined as the development of braking force.

  20. 53 GRRF Informal Document No.5 Proposed revision to Annex 10: Paragraph 7.5. Electronically controlled brake force distribution systems that cannot fulfil the requirements of paragraphs 7.1., 7.2., 7.3. and 7.4 above shall have a checking procedure of the functions which influence brake force distribution. In addition, when the vehicle is stationary, it must be possible to carry out the checks defined in paragraph 1.3.1. above by generating the nominal demand pressure value associated with the commencement of braking for both laden and unladen conditions.

  21. 53 GRRF Informal Document No.5 Current text in Annex 10: Paragraph 8. Vehicle testing During the type approval testing of the vehicle, the technical inspection authority shall verify conformity with the requirements contained in the present Annex and carry out any further tests considered necessary to this end. The report of the additional tests shall be appended to the Type-Approval form.

  22. 53 GRRF Informal Document No.5 Proposed revisions to Annex 10: Paragraph 8. Vehicle testing At the time type approval the technical service shall verify conformity with the requirements contained within this Annex and carry out any further tests considered necessary to this end. The results of any further tests shall be recorded and appended to the type approval report.

  23. 53 GRRF Informal Document No.4 Current text in Regulation 13: Paragraph 2.15.: Endurance braking systems 1/ 1/ Until uniform procedures have been agreed to calculate the effects of endurance braking systems on the provisions of Annex 10 to this Regulation, this definition does not cover vehicles fitted with regenerative braking systems. Footnote 1/ to be deleted

  24. 53 GRRF Informal Document No.4 Proposed addition to Annex 10: Paragraph 1.1.1. Where a vehicle is installed with an endurance braking system the retarding force produced by that system shall not be taken into consideration when determining the vehicle performance with respect to the provisions of this Annex

  25. 53 GRRF Informal Document No.4 Current text in Regulation 13: Paragraph 2.15.2.2.: Integrated endurance braking system 2/ 2/ Until uniform provisions have been agreed to calculate the effects of endurance braking systems on the provisions of Annex 10 to this Regulation, vehicles equipped with an integrated endurance braking system must also be equipped with an anti- lock system acting at least on the service brakes of the endurance braking system controlled axle and on the endurance braking system itself and tested according to the provisions of Annex 13 to this Regulation Footnote 2/ to be deleted

  26. 53 GRRF Informal Document No.4 Proposed addition to Annex 13 Paragraph 4.6.: Vehicles equipped with an integrated endurance braking system must also be equipped with an anti- lock braking system acting at least on the service brakes of the endurance braking system’s controlled axle and on the endurance braking system itself and shall fulfil the relevant requirements of this Annex.

  27. Summary of Proposed Changes Coupling force control: Text clarified Practical test introduced Text clarified in Annex 10 and Annex 13 Compatibility diagrams clarified Vehicle must commence braking between 0.2 and 1.0bar at the coupling head irrespective of load. Practical test introduced and test procedure defined Electronic brake force distribution Endurance braking limitation moved to Annex 10 Integrated endurance braking requirements moved to Annex 13

  28. GRRF Ad-Hoc Working Group Tractor / Trailer Braking Compatibility 53 GRRF - February 2003

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