1992L0024 — EN — 17.02.2004 — 001.001 — 1
This document is meant purely as a documentation tool and the institutions do not assume any liability for its contents
►B COUNCIL DIRECTIVE 92/24/EEC
of 31 March 1992
relating to speed limitation devices or similar speed limitation on-board systems of certain cate-
gories of motor vehicles
(OJ L 129, 14.5.1992, p. 154)
Amended by:
Official Journal
No page date
►M1 Directive 2004/11/EC of the European Parliament and of the Council of
11 February 2004L 44 19 14.2.2004
▼B
COUNCIL DIRECTIVE 92/24/EEC
of 31 March 1992
relating to speed limitation devices or similar speed limitation on-
board systems of certain categories of motor vehicles
THE COUNCIL OF THE EUROPEAN COMMUNITIES,
Having regard to the Treaty establishing the European EconomicCommunity, and in particular Article 100a thereof,
Having regard to the proposal from the Commission (
1),
In cooperation with the European Parliament (2),
Having regard to the opinion of the Economic and Social
Committee (3),
Whereas it is important to adopt measures with the aim of progres-
sively establishing the internal market over a period expiring on 31December 1992; whereas the internal market shall comprise an area
without internal frontiers in which the free movement of goods,
persons, services and capital is ensured;
Whereas the technical requirements which motor vehicles must satisfy
pursuant to national laws relate, inter alia, to speed limitation of
certain categories of vehicle;
Whereas these requirements differ from one Member State to another;
whereas it is therefore necessary for all Member States to adopt the
same requirements either in addition to, or in place of, their existing
rules in order to allow, in particular, the EEC type-approval procedurewhich was the subject of Directive 70/156/EEC (
4) to be applied in
respect of each type of vehicle;
Whereas, with a view to improving road safety and reducing the
severity of injuries in cases of accidents with heavy goods vehiclesand buses, it is considered urgently necessary to fit speed limitationdevices to these categories of motor vehicle;
Whereas in respect of environment and economy a reduction of air
pollution and fuel consumption can be achieved;
Whereas, in all cases where the Council confers powers upon the
Commission to implement rules laid down in the motor vehicle sector,
it is appropriate to provide for a procedure of prior consultationbetween the Commission and the Member States within an AdvisoryCommittee;
Whereas it is reasonable and useful to undertake research activities
relating to the development of variable speed limitation devices acti-vated in conformity with the speed limits warranted by the prevailingroad and traffic conditions within the framework of the Drive-programme,
HAS ADOPTED THIS DIRECTIVE:
Article 1
For the purpose of this Directive:
— ‘vehicle’ shall mean any motor vehicle of categories M2,M3,N2or
N3, as defined in Annex II to Directive 70/156/EEC, intended for1992L0024 — EN — 17.02.2004 — 001.001 — 2
(1) OJ No C 229, 4. 9. 1991, p. 5.
(2) OJ No C 13, 20. 1. 1992, p. 505; and OJ No C 67, 16.3.1992.
(3) OJ No C 40, 17. 2. 1992, p. 54.
(4) Council Directive 70/156/EEC of 6 February 1970, on the approximation of
the laws of the Member States relating to the type-approval of motor vehi-
cles and their trailers (OJ No L 42, 23. 2. 1970, p. 1.), as last amended by
Directive 87/403/EEC (OJ No L 220, 8. 8. 1987, p. 44).▼M1
▼M1
use on the road, having at least four wheels and a maximum design
speed exceeding 25 km/h,
— ‘speed limitation device’ shall mean a speed-limiting appliance
intended for use on a vehicle within the scope of this Directive forwhich type-approval of a separate technical unit within the meaning
of Directive 70/156/EEC may be granted. Built-in maximum
vehicle speed limitation systems, incorporated into the design ofvehicles from the outset, shall meet the same requirements as speedlimitation devices.
Article 2
Member states may not refuse:
— EEC type-approval or national type-approval for a vehicle, or refuse
or prohibit the sale, registration, entry into service or use of avehicle on grounds relating to its equipment with speed limitationdevices,
— EEC technical unit type-approval or national type-approval for a
speed limitation device, or prohibit the sale or use of a speedlimitation device,
if the requirements of the Annexes to this Directive are satisfied.
Article 3
Any amendments necessary to adapt the requirements of the Annexes
to this Directive to technical progress shall be adopted in accordance
with the procedure laid down in Article 13 of Directive 70/156/EEC.
Article 4
Member States shall bring into force the laws, regulations and admin-
istrative provisions necessary to comply with this Directive not later
than 1 January 1993. They shall forthwith inform the Commissionthereof.
When Member States adopt the provisions referred to in the preceding
subparagraph, they shall contain a reference to this Directive or shallbe accompanied by such reference at the time of their official publica-
tion. The methods of making such a reference shall be adopted by
Member States.
Article 5
With effect from 1 January 1994, Member States:
— may no longer issue the document provided for in the third indent
of Article 10 (1) of Directive 70/156/EEC in respect of a type ofvehicle of which the speed limitation device does not meet the
requirements of this Directive,
— may refuse to grant national type-approval in respect of a type of
vehicle of which the speed limition device does not comply with
the provisions of this Directive.
With effet from 1 October 1994, Member States may prohibit the first
entry into service of vehicles when such vehicles are not equipped witha speed limitation device complying with the provisions of this Direc-tive.
Article 6
This Directive is addressed to the Member States.1992L0024 — EN — 17.02.2004 — 001.001 — 3
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ANNEX 1
1. SCOPE
1.1. This Directive applies to speed limitation devices, EEC type-approved
as separate technical units for motor vehicles, and the equipment of
motor vehicles, as described in Article 1, with these approved devices
or similar speed limitation systems meeting the requirements of the
Annexes to this Directive.
Motor vehicles, whose maximum design speed is lower than the set
speed as provided for in Council Directive 92/6/EEC of 10 February
1992 on the installations and use of speed limitation devices for certain
categories of motor vehicles in the Community (1) need not be fitted
with speed limitation devices or systems.
►M1 The purpose of this Directive is to limit to a specified value the
maximum road speed of goods vehicles of categories N2and N3and of
passenger-carrying vehicles of categories M2and M3.◄ This is
achieved by a speed limitation device or an on-board speed limitation
system whose primary function is to control the fuel feed to the engine.
2. DEFINITIONS
2.1. For the purpose of this Directive:2.2. ‘Limitation speed V’ means the maximum speed of the vehicle such that
its design or equipment does not permit a response after a positive
action on the accelerator control.
2.3. ‘Set speed (V set)’ means the intended mean vehicle speed when oper-
ating in a stabilized condition.
2.4. ‘Stabilized speed (V stab)’ means the vehicle speed when operating in
the conditions as specified in point 1.1.4.2.3 of Annex III.
2.5. ‘Speed limitation device’ means a device whose primary function is to
control the fuel feed to the engine in order to limit the vehicle speed tothe specified value.
2.6. ‘Unladen mass’ means the mass of the vehicle in running order,
including coolant, oils, fuel, tools and spare wheel on board, where
applicable.
2.7. ‘Vehicle type’ means vehicles which do not differ in such essential
respects as:
2.7.1. — make and type of the speed limitation system or the speed limitation
device, if any,
2.7.2. — range of speeds at which the limitation may be set within the range
established for the tested vehicle,
2.7.3. — maximum engine power to unladen mass ratio less than or equal to
that of the tested vehicle, and
2.7.4. — highest ratio of engine speed to vehicle speed in top gear less than
that of the tested vehicle.
2.8. ‘Type speed limitation device’ means speed limitation devices which do
not differ with respect to the essential characteristics such as:
— make and type of the device,
— range of speed values at which the speed limitation device may be
set,
— method used to control the fuel feed of the engine.
3. APPLICATION FOR EEC VEHICLE TYPE-APPROVAL
3.1. The application for approval of a vehicle type with regard to speed
limitation shall be submitted by the vehicle manufacturer or by his
duly accredited representative.
3.2. It shall be accompanied by the undermentioned documents in triplicate
and by the following particulars:1992L0024 — EN — 17.02.2004 — 001.001 — 4
(1) OJ No L 57, 2. 3. 1992, p. 27.
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3.2.1. a detailed description of the vehicle type and of vehicle parts related to
the speed limitation, comprising the particulars and documents referred
to in Annex II, Appendix I.
3.2.2. A vehicle representative of the type to be approved shall be submitted
to the technical service responsible for conducting the approval tests.
3.2.3. A vehicle not comprising all the components proper to the type may be
accepted for tests provided that it can be shown by the applicant to the
satisfaction of the competent authority that the absence of the compo-
nents omitted has no effect on the results of the verifications, so far as
the requirements of this Directive are concerned.
3.3. The competent authority shall verify the existence of satisfactory
arrangements for ensuring effective checks on conformity of production
before EEC type-approval is granted.
4. EEC TYPE-APPROVAL
4.1. If the vehicle submitted for approval pursuant to this Directive meets
the requirements of point 7 below, approval of that vehicle type shall
be granted.
Notice of approval or of extension or of refusal of approval of a vehicle
type pursuant to this Directive shall be communicated to the Member
States by means of a form conforming to the model in Annex II,
Appendix 2 to this Directive.
4.2. An approval number shall be assigned to each type approved. The same
Member State may not assign the same number to another vehicle type.
5. APPLICATION FOR TECHNICAL UNIT EEC TYPE-APPROVAL
OF A SPEED LIMITATION DEVICE
5.1. The application for EEC type-approval of a speed limitation device as a
technical unit must be submitted by the manufacturer of the speed
limitation device or by his duly accredited representative.
5.2. For each type of speed limitation device the application must be accom-
panied by:
5.2.1. documentation in triplicate giving a description of the technical charac-
teristics of the speed limitation device and the method of itsinstallations on one or more types of vehicle for which the speed limita-
tions device is intended to be installed;
5.2.2. five samples of the type of speed limitation device; the samples must be
clearly and indelibly marked with the applicant's trade name or mark
and the type designation;
5.2.3. a vehicle or an engine (in the case of testing on an engine bench) fitted
with the speed limitation device to be type approved, chosen by the
applicant in agreement with the technical service responsible for
conducting approval tests.
5.3. The competent authority shall verify the existence of satisfactory
arrangements for ensuring effective control of the conformity of
production of the speed limitation device before type-approval is
granted.
6. APPROVAL
6.1. If the speed limitation device submitted for approval pursuant to this
Directive meets the requirements of item 7 below, approval of that
type of speed limitation device shall be granted.
6.2. An approval number shall be assigned to each type of speed limitation
device approved. Its first two digits (00 for the Directive in its original
form) shall indicate the series of amendments incorporating the most
recent major technical amendments made to the Directive at the time
of issue of the approval. The same Member State may not assign the
same number to another type of speed limitation device.
6.3. Notice of approval, or of extension or of refusal of approval of a type
of speed limitation device pursuant to this Directive shall be communi-
cated to the Member States by means of a form conforming to the
model in Annex II, Appendix 4 to this Directive.
6.4. There shall be affixed, conspicuously and in a readily accessible place
specified on the approval form, to every speed limitation device
conforming to a type of speed limitation device approved under this
Directive an international approval mark consisting of:1992L0024 — EN — 17.02.2004 — 001.001 — 5
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6.4.1. a rectangle surrounding the letter ‘e’ followed by the distinguishing
number of the country which has granted approval; and
6.4.2. the approval number, as given on the EEC type-approval certificate (see
Annex II, Appendix 4), near to the rectangle of the approval mark.
6.5. The approval mark shall be clearly legible and indelible.
6.6. Annex II, Appendix 6 to this Directive gives an example of the arrange-
ment of the approval mark.
7. REQUIREMENTS7.1. General
7.1.1. The speed limitation must be such that the vehicle in normal use,
despite the vibrations to which it may be subjected, complies with the
provisions of this Directive. The speed limitation device shall be so
designed, constructed and assembled as to enable the vehicle in normal
use, fitted with the speed limitation device, to comply with the provi-
sions of this Directive.
7.1.2. In particular, the speed limitation device of the vehicle must be so
designed, constructed and assembled as to resist corrosion and ageing
phenomena to which it may be exposed and to resist tampering.
7.1.2.1. The limitation threshold must not, in any case, be capable of being
increased or removed temporarily or permanently on vehicles in use.
The inviolability shall be demonstrated to the technical service with
documentation analysing the failure mode in which the system will be
globally examined.
The analysis shall show, taking into account the different states taken
by the system, the consequences of a modification of the input or
output states on the functioning, the possibilities of obtaining these
modifications by failures or by tampering and the possibility of their
occurence. The analysis level will be always to the first failure.
7.1.2.2. The speed limitation function, the speed limitation device and the
connections necessary for its operation, except those essential for the
running of the vehicle, shall be capable of being protected from any
unauthorized adjustments or the interruption of its energy supply by
the attachment of sealing devices and/or the need to use special tools.
7.1.3. The speed limitation function and the speed limitation device shall not
actuate the vehicle's service braking system. A permanent brake (e.g.
retarder) may be incorporated only if it operates after the speed limita-
tion device has restricted the fuel feed to the minimum fuel position.
7.1.4. The speed limitation function or the speed limitation device must be
such that its does not affect the vehicle's road speed if a positive action
on the accelerator is applied when the vehicle is running at its set
speed.
7.1.5. The speed limitation function or the speed limitation device may allow
normal accelerator control for the purposes of gear changing.
7.1.6. No malfunction or tampering shall result in an increase in engine power
above that demanded by the position of the driver's accelerator.
7.1.7. The speed limitation function shall be obtained regardless of the accel-
erator control used if there is more than one such control which may be
reached from the driver's seating position.
7.1.8. The speed limitation function or the speed limitation device shall
operate satisfactorily in its electromagnetic environment without unac-
ceptable electromagnetic disturbance for anything in this environment.
7.1.9. All components necessary for the full function of the speed limitation
or the speed limitation device shall be energized whenever the vehicle
is being driven.
7.2. Special requirements
7.2.1. For the different categories of motor vehicles the limitation speed V
shall be set in accordance with Directive 92/6/EEC.
7.2.2. This speed limitation may be achieved either by the equipment of the
motor vehicles with EEC type-approved speed limitation devices or
similar systems on board of the vehicles fulfilling the same speed
limitation function.1992L0024 — EN — 17.02.2004 — 001.001 — 6
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7.2.3. The set speed shall be indicated on a plate in a conspicuous position in
the driver compartment of each vehicle.
8. TEST
The speed limitation tests to which the vehicle or the speed limitation
device presented for EEC type-approval is submitted as well as the
limitation performances required, are described in Annex III to this
Directive.
At the request of the manufacturer and with the agreement of the type-
approval authority, vehicles whose calculated unlimited maximum
speed does not exceed the set speed defined for those vehicles may be
exempted from the testing of Annex III provided the requirements of
this Directive are met.
9. MODIFICATION OF THE TYPE OF THE VEHICLE OR THE
SPEED LIMITATION DEVICE AND EXTENSION OF EEC TYPE-
APPROVAL
9.1. Every modification of the vehicle type or the type of the speed limita-
tion device shall be notified to the administrative department which
approved the vehicle type. The department may then either:
9.1.1. consider that the modifications made are unlikely to have an appreci-
able adverse effect and that in any case the vehicle or the speed
limitation device still complies with the requirements; or
9.1.2. require a further test report from the technical service responsible for
conducting the tests.
9.2. Confirmation or refusal of approval, specifying the alteration, shall be
communicated by the procedure specified in paragraph 4.1 above to
the Member States.
9.3. The competent authority issuing an extension of approval shall assign a
series number to each communication form drawn up for such an exten-
sion.
10. CONFORMITY OF PRODUCTION
10.1. Every vehicle or speed limitation device approved under this Directive
shall be so manufactured as to conform to the type approved by
meeting the requirements set out in point 7 above.
10.2. In order to verify that the requirements of item 10.1 are met, suitable
checks of the production shall be carried out.
10.3. The holder of the approval shall, in particular:10.3.1. ensure the existence of procedures for effective quality control of the
vehicle or the speed limitation device;
10.3.2. have access to the testing equipment necessary for checking conformity
to each approved type;
10.3.3. ensure that test result data are recorded and that the annexed documents
remain available for a period to be determined in agreement with the
administrative department;
10.3.4. analyse the results of each type of test, in order to verify and ensure the
consistency of characteristics of the vehicle or the speed limitation
device, making allowance for permissible variations in industrial
production;
10.3.5. ensure that for each type of vehicle or speed limitation device sufficient
checks and tests are carried out in accordance with the procedures
approved with the competent authority;
10.3.6. ensure that any set of samples or test pieces giving evidence of non-
conformity in the type of test in question shall give rise to a further
sampling and test. All necessary steps shall be taken to restore confor-
mity of the corresponding production.
10.4. The competent authority which has granted type-approval may at any
time verify the conformity control methods applied in each production
unit.
10.4.1. At every inspection, the test records and production records shall be
presented to the visiting inspector.1992L0024 — EN — 17.02.2004 — 001.001 — 7
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10.4.2. The inspector may select samples at random to be tested in the manu-
facturer's laboratory. The minimum number of samples may be
determined according to the results of the manufacturer's own checks.
10.4.3. Where the quality level appears unsatisfactory or it seems necessary to
verify the validity of the tests carried out in application of item 10.4.2,
the inspector shall select samples to be sent to the technical service
which conducted the type-approval tests.
10.4.4. The competent authority may carry out any test prescribed in this
Directive. The normal frequency of inspections authorized by the
competent authority shall be one every two years. In cases where unsa-
tisfactory results are found during one of these inspections, the
competent authority shall ensure that all necessary steps are taken to
restore conformity of production as rapidly as possible.
11. PENALTIES FOR NON-CONFORMITY OF PRODUCTION
11.1. The approval granted in respect of a vehicle type or type of a speed
limitation device pursuant to this Directive may be withdrawn if the
requirements laid down in item 7 above are not complied with.
11.2. If a Member State withdraws an EEC type-approval it has previously
granted, it shall forthwith so notify the other Member States, by means
of a copy of the EEC type-approval certificate according to the model
set out in Annex II, Appendix 2 or 4.1992L0024 — EN — 17.02.2004 — 001.001 — 8
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ANNEX II
Appendix 1
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Appendix 2
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Appendix 3
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Appendix 4
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Appendix 5
Example of an EEC unit type-approval mark
The above technical unit type-approval mark, affixed to a speed limitation
device, shows that the technical unit concerned was approved in France (e2)
pursuant to this Directive under the type-approval number 001241. The first
two digits indicate that the speed limitation device was approved according to
the original form of this Directive.1992L0024 — EN — 17.02.2004 — 001.001 — 17
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ANNEX III
TESTS AND PERFORMANCES
1. TESTS OF SPEED LIMITATION DEVICE
At the request of the applicant for approval tests shall be made in
accordance with either points 1.1, 1.2 or 1.3 below.
1.1. Measurement on test track
1.1.1. Preparation of the vehicle
1.1.1.1. A vehicle representative of the vehicle type to be approved or a
device representative of the speed limitation device type as appro-
priate shall be submitted to the technical service.
1.1.1.2. The settings of the engine of the test vehicle, particularly the fuel feed
(carburetter or injection system) shall conform to the specifications of
the vehicle manufacturer.
1.1.1.3. The tyres shall be bedded and the pressure shall be as specified by the
manufacturer of the vehicle.
1.1.1.4. The vehicle mass shall be the unladen mass as declared by the manu-
facturer.
1.1.2. Characteristics of the test track
1.1.2.1. The test surface shall be suitable to enable stabilized speed to be
maintained and shall be free from uneven patches. Gradients shall
not exceed 2 % and shall not vary by more than 1 % excluding
camber effects.
1.1.2.2. The test surface shall be free from standing water, snow or ice.1.1.3. Ambient weather conditions
1.1.3.1. The mean wind speed measured at a height at least 1 m above the
ground shall be less than 6 m/s with gusts not exceeding 10 m/s.
1.1.4. Acceleration test method
1.1.4.1. The vehicle running at a speed which is 10 km/h below the set speed
shall be accelerated as much as possible using a fully positive action
on the accelerator control.
This action shall be maintained at least 30 seconds after the vehicle
speed has been stabilized. The instantaneous vehicle speed shall be
recorded during the test in order to establish the curve of the speed
versus the time and during-the operation of the speed limitation func-
tion or of the speed limitation device as appropriate. The accuracy of
the speed measurement shall be ± 1 %. The accuracy of the time
measurement shall be within 0,1 s.
1.1.4.2. Acc ept anc e crit eri a for th e acc el erat ion t est
The test shall be satisfactory if the following conditions are met:
1.1.4.2.1. The stabilized speed Vstab reached by the vehicle shall be equal or
less than the set speed Vset. However a tolerance of 5 % of the Vset
value or 5 km/h whichever is the greater is acceptable.
1.1.4.2.2. Transient response (see figure 2 of appendix)
After the stabilized speed is reached for the first time:
(a) the maximum speed shall not exceed the stabilized speed Vstab
by more than 5 %;
(b) the rate of change of speed shall not exceed 0,5 m/s
2when
measured on a period greater than 0,1 s; and
(c) the stabilized speed conditions specified in 1.1.4.2.3. shall be
attained within 10 s of first reaching of the stabilized speed
Vstab.
1.1.4.2.3. Stabilized speed (see figure 2 of appendix)
When stable speed control has been achieved:
(a) speed shall not vary by more than 4 % of the stablized speed
Vstab or 2 km/h whichever is the greater;1992L0024 — EN — 17.02.2004 — 001.001 — 18
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(b) the rate of change of speed shall not exceed 0,2 m/s2when
measured on a period greater than 0,1 s.
(c) the stabilized speed (Vstab) is the average speed calculated during
a minimum period of 20 seconds beginning 10 seconds after the
stabilized speed is achieved.
1.1.4.2.4. Tests in acceleration shall be carried out and the acceptance criteria
verified for each reduction ratio of gear allowing the speed limit to
be exceeded.
1.1.5. Test method at steady speed
1.1.5.1. The vehicle shall be driven at full acceleration up to the steady speed,
then shall be maintained at this speed without any modification on the
test basis of at least 400 metres. The vehicle's average speed measure-
ment shall then be repeated on the same test basis, but run in the
opposite direction, and under the same procedures.
The stabilization speed for the whole test previously considered is the
mean of the two average speeds measured on going trips and on
coming back trips of the test basis. The whole test including the
calculation of the stabilization speed shall be carried out five times.
The speed of measurement shall be carried out with an accuracy of
± 1 %, the time measurements with an accuracy of 0,1 s.
1.1.5.2. Acceptance criteria for steady speed test
Tests are judged satisfactory if the following conditions are fulfilled:
1.1.5.2.1. None of the stabilization speeds Vstab obtained shall exceed set speed
Vset. However, a tolerance of 5 % of the Vset value or 5 km/h which-
ever is the greater is acceptable.
1.1.5.2.2. The gap between the extreme stabilization speeds obtained during the
tests shall not exceed 3 km/h.
1.1.5.2.3. Tests in steady speed shall be carried out and the acceptance criteria
verified for each reduction gear ratio allowing in theory the speed
limit to be exceeded.
1.2. Tests on chassis dynamometer
1.2.1. Characteristics of the chassis dynamometer
The equivalent inertia of the vehicle mass shall be reproduced on the
chassis dynamometer with an accuracy of ± 10 %. The speed of the
vehicle shall be measured with an accurancy of ± 1 %. The time shall
be measured with an accuracy of 0,1 s.
1.2.2. Acceleration test method
1.2.2.1. The power absorbed by the brake of the chassis dynamometer during
the test shall be set to correspond with the vehicle's resistance to
progressive movement at the tested speed(s). This power may be
established by calculation and shall be set to an accuracy of ± 10 %.
At the request of the applicant, and with the agreement of the compe-
tent authority the power absorbed may alternatively be set at 0,4 Pmax
(Pmax ist the maximum power of the engine). The vehicle running at
a speed which is 10 km/h below its set speed shall be accelerated at
the maximum possibilities of the engine by using a fully positive
action on the acceleration control. This action shall be maintained at
least 20 seconds after the vehicle speed-has been stablized. The
instantaneous vehicle speed shall be recorded during the test in order
to establish the curve of the speed versus the time and during the
operation of the speed limitation device.
1.2.2.2. Acc ept anc e crit eri a for th e acc el erat ion t est
The test shall be satisfactory if the following conditions are met:
1.2.2.2.1. The stabilized speed Vstab reached by the vehicle shall be equal or
less than the set speed Vset. However a tolerance of 5 % of the Vset
value or 5 km/h whichever is the greater is acceptable.
1.2.2.2.2. Transient response (see figure 2 of appendix)
After the stabilized speed is first achieved:
(a) the maximum speed shall not exceed the stabilized speed Vstab
by more than 5 %;
(b) the rate of change of speed shall not exceed 0,5 m/s2when
measured on a period greater than 0,1 s; and1992L0024 — EN — 17.02.2004 — 001.001 — 19
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(c) the stabilized speed conditions specified in point 1.2.2.2.3 shall be
attained within 10 s of first reaching of the stabilized speed
Vstab.
1.2.2.2.3. Stabilized speed (see figure 2 of appendix)
When stable speed control has been achieved:
(a) speed shall not vary by more than 4 % of the stabilized speed
Vstab or 2 km/h whichever is the greater;
(b) the rate of change of speed shall not exceed 0,2 m/s2when
measured on a period greater than 0,1 s.
1.2.2.2.4. Tests in acceleration shall be carried out and the acceptance criteria
verified for each reduction ratio of gear acceleration allowing in
theory the speed limit to be exceeded.
1.2.3. Test method for steady speed test
1.2.3.1. The vehicle shall be installed on the chassis dynamometer. The
following acceptance criteria should be met for power absorbed by
the chassis dynamometer varying progressively from the maximum
power Pmax to a value equal to 0,2 Pmax. The speed of the vehicle
shall be recorded in the full range of power defined above. The
maximum speed of the vehicle shall be determined on this range.
Test and record defined above shall be made five times.
1.2.3.2. Acc ept anc e crit eri a for ste ady spe ed te st
Tests are judged satisfactory if the following conditions are fulfilled:
1.2.3.2.1. Non of the stabilization speeds Vstab obtained shall exceed the set
speed Vset. However, a tolerance of 5 % of the Vset value or 5 km/
h, whichever is the greater, is acceptable.
1.2.3.2.2. The gap between the extreme stabilization speed obtained during the
test shall not exceed 3 km/h.
1.2.3.2.3. Tests in steady speeds shall be carried out and the acceptance criteria
verified for each reduction gear ratio allowing in theory the speed
limit to be exceeded.
1.3. Test on engine test bench
This test procedure can only be used when the applicant can demon-
strate to the satisfaction of the technical services that this method is
equivalent to the measurement on a test track.
2. ENDURANCE TEST
The speed limitation device shall be submitted to a durability test
following the procedure prescribed below. However, this may be
omitted if the applicant demonstrates the resistance to aging effects.
2.1. The device is cycled on a bench simulating the attitude and the move-
ment which the speed limitation device would experience on the
vehicle.
2.2. A functioning cycle is maintained by means of a control system
supplied by the manufacturer. The diagram of the cycle is given
below:
t0—t1—t2—t3—t4—t5—t6—t7: the time taken to do this
operation
t1−t2= 2 seconds1992L0024 — EN — 17.02.2004 — 001.001 — 20
▼B
t3−t4= 1 second
t5−t6= 2 seconds
t7−t8= 1 second
Five conditionings are defined hereafter. The speed limitation device
(SLD) samples of the type presented for approval shall be submitted
to the conditionings according to the table below:
1st SLD 2nd SLD 3rd SLD 4th SLD
Conditioning 1 x
Conditioning 2 xConditioning 3 x
Conditioning 4 x
Conditioning 5 x
2.2.1. Conditioning 1: tests at ambient temperature (293 K ± 2 K); number
of cycles: 50 000.
2.2.2. Conditioning 2: tests at high temperatures.
2.2.2.1. Ele ct roni c com ponents
The components shall be cycled in a climatic chamber. A temperature
of 338 K ± 5 K is maintained during the whole functioning. Number
of cycles: 12 500.
2.2.2.2. Mec hani ca l com ponents
The components shall be cycled in a climatic chamber. A temperature
of 373 K ± 5 K is maintained during the whole functioning. Number
of cycles: 12 500.
2.2.3. Conditioning 3: tests at low temperature.
In the climatic chamber used for conditioning 2, a temperature of
253 K ± 5 K is maintained during the whole functioning. Number of
cycles: 12 500.
2.2.4. Conditioning 4: test in a salted atmosphere. Only for components
exposed to the ambient road environment.
The device shall be cycled in a salted atmosphere chamber. The
concentration of sodium chloride is of 5 % and internal temperature
of the climatic chamber is 308 K ± 2 K. Number of cycles: 12 500.
2.2.5. Conditioning 5: vibration test
2.2.5.1. The speed limitation device is mounted in a similar way to its
mounting on the vehicle.
2.2.5.2. Sinusoldal vibrations shall be applied in all three planes; logarithmic
sweep shall be 1 octave per minute.
2.2.5.2.1. First test: frequency range 10-24 Hz, amplitude ± 2 mm.
2.2.5.2.2. Second test: frequency range 24-1 000 Hz for chassis and cab
mounted technical units, input 2,5 g. For engine mounted technical
units, input 5 g.
2.3. Acceptance criteria of the endurance tests2.3.1. At the end of the endurance tests, no modification of the device's
performances shall be observed regarding the set speed.
2.3.2. However, if any breaking down of the device occurs during one of the
endurance tests, a second device can be submitted to the endurance
tests under consideration at the manufacturer's request.1992L0024 — EN — 17.02.2004 — 001.001 — 21
▼B
Appendix
1. ASYMPTOTIC CURVE
Figure 1
In this case, Vset = Vmax; only the condition on maximum speed is to be satis-
fied.
2. OSCILLATING CURVE
Figure 2
Vmax is the maximum speed reached by the vehicle on the first half-period of
the response curve.
Vstab is the stabilized vehicle speed. It is the average speed calculated during a
minimum period of 20 seconds beginning 10 seconds after the stabilizing speed
is achieved.1992L0024 — EN — 17.02.2004 — 001.001 — 22