GRRF Ad-Hoc Working Group

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

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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.
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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.
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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.

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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.
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Document GRRF/2003/5 - Compatibility Diagrams
Annex 10 - Diagram 2 Towing Vehicles and Trailers
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Document GRRF/2003/5 - Compatibility Diagrams
Annex 10 - Diagram 3 Tractors for Semi-Trailers
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Document GRRF/2003/5 - Compatibility Diagrams
Annex 10 - Diagram 4A Semi-Trailers
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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
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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 - - - - -
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Document GRRF/2003/4
Proposed revisions to Annex 10
Paragraph 1.2
Amend ISO11992 reference.
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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.
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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
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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).
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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.
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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 lt1.2bar.
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.
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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.
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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.
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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.
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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.
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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
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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
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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
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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 systems
controlled axle and on the endurance braking
system itself and shall fulfil the relevant
requirements of this Annex.
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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
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GRRF Ad-Hoc Working Group
Tractor / Trailer Braking Compatibility
53 GRRF - February 2003