Regulation No 79 of the Economic Commission for Europe of the United Nations (UN/ECE) — Uniform provisions concerning the approval of vehicles with regard to steering equipment
Date: 2008-05-27
Institutions: United Nations Economic Commission for Europe
Subjects: approval, driving mechanism, harmonisation of standards, international standard, technical regulations, vehicle

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ACTS ADOPTED BY BODIES CREATED BY INTERNATIONAL AGREEMENTS

Only the original UN/ECE texts have legal effect under international public law. The status and date of entry into force of this Regulation
should be checked in the latest version of the UN/ECE status document TRANS/WP.29/343, available at:
http://www.unece.org/trans/main/wp29/wp29wgs/wp29gen/wp29fdocstts.html

Regulation No 79 of the Economic Commission for Europe of the United Nations (UN/ECE) —
Uniform provisions concerning the approval of vehicles with regard to steering equipment

Addendum 78: Regulation No 79

Revision 2

Incorporating all valid text up to:
Supplement 3 to the 01 series of amendments — Date of entry into force: 4 April 2005

Corrigendum 20 January 2006

CONTENTS

REGULATION

0.

Introduction

1. Scope

2. Definitions

3. Application for approval

4. Approval

5. Construction provisions

6. Test provisions

7. Conformity of production

8. Penalties for non-conformity of production

9. Modification and extension of approval of the vehicle type

10. Production definitely discontinued

11. Names and addresses of technical services responsible for conducting approval tests and of administrative

departments

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ANNEXES

Annex 1 — Communication concerning the approval or refusal or extension or withdrawal of approval or
production definitely discontinued of a vehicle type with regard to steering equipment pursuant
to Regulation No 79

Annex 2 — Arrangements of approval marks

Annex 3 — Braking performance for vehicles using the same energy source to supply steering equipment

and braking device

Annex 4 — Additional provisions for vehicles equipped with ASE

Annex 5 — Provision for trailers having hydraulic steering transmission

Annex 6 — Special requirements to be applied to the safety aspects of complex electronic vehicle control

systems

0.

INTRODUCTION

The intention of
the Regulation is to establish uniform provisions for the layout and
performance of steering systems fitted to vehicles used on the road. Traditionally the major
requirement has been that the main steering system contains a positive mechanical
link
between the steering control, normally the steering wheel, and the road wheels in order to
if amply dimensioned, has been
determine the path of the vehicle. The mechanical
regarded as not being liable to failure.

link,

Advancing technology, coupled with the wish to improve occupant safety by elimination of
the mechanical steering column, and the production advantages associated with easier transfer
of the steering control between left and right hand drive vehicles, has led to a review of the
traditional approach and the Regulation is now amended to take account of the new tech-
nologies. Accordingly it will now be possible to have steering systems in which there is not
any positive mechanical connection between the steering control and the road wheels.

Systems whereby the driver remains in primary control of the vehicle but may be helped by
the steering system being influenced by signals initiated on-board the vehicle are defined as
‘Advanced Driver Assistance Steering Systems’. Such Systems can incorporate an ‘Automa-
tically Commanded Steering Function’, for example, using passive infrastructure features to
assist the driver in keeping the vehicle on an ideal path (Lane Guidance, Lane Keeping or
Heading Control), to assist the driver in manoeuvring the vehicle at low speed in confined
spaces or to assist the driver in coming to rest at a pre-defined point (Bus Stop Guidance).
Advanced Driver Assistance Steering Systems can also incorporate a ‘Corrective Steering
Function’ that, for example, warns the driver of any deviation from the chosen lane (Lane
Departure Warning), corrects the steering angle to prevent departure from the chosen lane
(Lane Departure Avoidance) or corrects the steering angle of one or more wheels to improve
the vehicle’s dynamic behaviour or stability.

In the case of any Advanced Driver Assistance Steering System, the driver can, at all times,
choose to override the assistance function by deliberate action, for example, to avoid an
unforeseen object in the road.

It is anticipated that future technology will also allow steering to be influenced or controlled
by sensors and signals generated either on or off-board the vehicle. This has led to several
concerns regarding responsibility for the primary control of the vehicle and the absence of any
to off-board or external
internationally agreed data transmission protocols with respect
control of steering. Therefore,
the general approval of
the Regulation does not permit
systems that incorporate functions by which the steering can be controlled by external
signals, for example, transmitted from roadside beacons or active features embedded into
the road surface. Such systems, which do not require the presence of a driver, have been
defined as ‘Autonomous Steering Systems’.

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This Regulation also prevents the approval of positive steering of trailers using energy supply
and electrical control from the towing vehicle as there are not any standards applicable to
energy supply connectors or to control transmission digital
information interchange. It is
expected that at some time in the future, the International Standards Organization (ISO)
Standard, ISO 11992, will be amended to take account of transmission of steering control
data.

SCOPE

This Regulation applies to the steering equipment of vehicles of categories M, N and O (1).

This Regulation does not apply to:

1.

1.1.

1.2.

1.2.1.

Steering equipment with a purely pneumatic transmission;

1.2.2.

Autonomous Steering Systems as defined in paragraph 2.3.3;

1.2.3.

1.2.4.

Full power steering systems fitted to trailers where the energy necessary for operation is
transmitted from the towing vehicle;

The electrical control of full power steering systems fitted to trailers, other than additional
steering equipment as defined in paragraph 2.5.2.4.

2.

DEFINITIONS

For the purposes of this Regulation:

2.1.

2.2.

2.2.1.

2.3.

‘Approval of a vehicle’ means the approval of a vehicle type with regard to its steering
equipment.

‘Vehicle type’ means a vehicle which does not differ with respect to the manufacturer’s
designation of the vehicle type and in essential characteristics such as:

type of steering equipment, steering control, steering transmission, steered wheels, and energy
source.

‘Steering equipment’ means all the equipment the purpose of which is to determine the
direction of movement of the vehicle.

The steering equipment consists of:

— The steering control,

— The steering transmission,

— The steered wheels,

— The energy supply, if any.

2.3.1.

‘Steering control’ means the part of the steering equipment which controls its operation; it
may be operated with or without direct intervention of the driver. For steering equipment in
which the steering forces are provided solely or partly by the muscular effort of the driver the
steering control includes all parts up to the point where the steering effort is transformed by
mechanical, hydraulic or electrical means;

(1) As defined in Annex 7 of

the Consolidated Resolution on the Construction of Vehicles

(R.E.3)

(TRANS/

SC.1/WP.29/78/Rev.1).

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2.3.2.

‘Steering transmission’ means all components which form a functional
steering control and the road wheels.

link between the

The transmission is divided into two independent functions:

The control transmission and the energy transmission.

Where the term ‘transmission’ is used alone in this Regulation, it means both the control
transmission and the energy transmission. A distinction is drawn between mechanical, elec-
trical and hydraulic transmission systems or combinations thereof, according to the means by
which the signals and/or energy is transmitted.

2.3.2.1.

‘Control transmission’ means all components by means of which signals are transmitted for
control of the steering equipment.

2.3.2.2.

‘Energy transmission’ means all components by means of which the energy required for
control/Regulation of the steering function of the wheels is transmitted.

2.3.3.

2.3.4.

2.3.4.1.

2.3.4.2.

2.3.5.

2.3.6.

‘Autonomous Steering System’ means a system that incorporates a function within a complex
electronic control system that causes the vehicle to follow a defined path or to alter its path in
response to signals initiated and transmitted from off-board the vehicle. The driver will not
necessarily be in primary control of the vehicle.

‘Advanced Driver Assistance Steering System’ means a system, additional to the main steering
system, that provides assistance to the driver in steering the vehicle but in which the driver
remains at all times in primary control of the vehicle. It comprises one or both of the
following functions:

‘Automatically commanded steering function’ means the function within a complex electronic
control system where actuation of the steering system can result from automatic evaluation of
signals initiated on-board the vehicle, possibly in conjunction with passive infrastructure
features, to generate continuous control action in order to assist the driver in following a
particular path, in low speed manoeuvring or parking operations.

‘Corrective steering function’ means the discontinuous control function within a complex
electronic control system whereby, for a limited duration, changes to the steering angle of
one or more wheels may result from the automatic evaluation of signals initiated on-board the
vehicle, in order to maintain the basic desired path of the vehicle or to influence the vehicle’s
dynamic behaviour.

Systems that do not themselves positively actuate the steering system but that, possibly in
conjunction with passive infrastructure features, simply warn the driver of a deviation from
the ideal path of the vehicle, or of an unseen hazard, by means of a tactile warning trans-
mitted through the steering control, are also considered to be corrective steering.

‘Steered wheels’ means the wheels, the alignment of which may be altered directly or indirectly
in relation to the longitudinal axis of the vehicle in order to determine the direction of
movement of
(The steered wheels include the axis around which they are
rotated in order to determine the direction of movement of the vehicle);

the vehicle.

‘Energy supply’ includes those parts of the steering equipment which provide it with energy,
regulate that energy and where appropriate, process and store it. It also includes any storage
reservoirs for the operating medium and the return lines, but not the vehicle’s engine (except
for the purpose of paragraph 5.3.2.1.) or its drive to the energy source.

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2.3.6.1.

‘Energy source’ means the part of the energy supply, which provides the energy in the required
form.

2.3.6.2.

‘Energy reservoir’ means that part of the energy supply in which the energy provided by the
energy source is stored, for example, a pressurised fluid reservoir or vehicle battery.

2.3.6.3.

‘Storage reservoir’ means that part of the energy supply in which the operating medium is
stored at or near to the atmospheric pressure, for example a fluid reservoir.

2.4.

2.4.1.

2.4.2.

2.4.3.

Steering parameters
‘Steering control effort’ means the force applied to the steering control in order to steer the
vehicle.

‘Steering time’ means the period of time from the beginning of the movement of the steering
control to the moment at which the steered wheels have reached a specific steering angle.

‘Steering angle’ means the angle between the projection of a longitudinal axis of the vehicle
and the line of intersection of the wheel plane (being the central plane of the wheel, normal to
the axis around which it rotates) and the road surface.

2.4.4.

‘Steering forces’ mean all the forces operating in the steering transmission.

2.4.5.

2.4.6.

2.4.7.

‘Mean steering ratio’ means the ratio of the angular displacement of the steering control to the
mean of the swept steering angle of the steered wheels for a full lock-to-lock turn;

‘Turning circle’ means the circle within which are located the projections onto the ground
plane of all the points of the vehicle, excluding the external mirrors and the front direction
indicators, when the vehicle is driven in a circle;

‘Nominal radius of steering control’ means in the case of a steering wheel the shortest
dimension from its centre of rotation to the outer edge of the rim. In the case of any
other form of control it means the distance between its centre of rotation and the point at
which the steering effort is applied. If more than one such point is provided, the one requiring
the greatest effort shall be used.

2.5.

Types of steering equipment

Depending on the way the steering forces are produced, the following types of equipment are
distinguished:

2.5.1.

For motor vehicles:

2.5.1.1.

‘Main steering system’ means the steering equipment of a vehicle which is mainly responsible
for determining the direction of travel. It may comprise:

2.5.1.1.1.

‘Manual steering equipment’ in which the steering forces result solely from the muscular effort
of the driver.

2.5.1.1.2.

‘Power assisted steering equipment’ in which the steering forces result from both the muscular
effort of the driver and the energy supply (supplies).

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2.5.1.1.2.1.

Steering equipment in which the steering forces result solely from one or more energy
supplies when the equipment is intact, but in which the steering forces can be provided by
the muscular effort of the driver alone if there is a fault in the steering (integrated power
systems), is also considered to be power assisted steering equipment;

2.5.1.1.3.

‘Full-power steering equipment’ in which the steering forces are provided solely by one or
more energy supplies;

2.5.1.2.

2.5.1.3.

‘Self-tracking steering equipment’ means a system designed to create a change of steering angle
on one or more wheels only when acted upon by forces and/or moments applied through the
tyre to road contact.

‘Auxiliary steering equipment (ASE)’ means a system in which the wheels on axle(s) of vehicles
of categories M and N are steered in addition to the wheels of the main steering equipment in
the same or opposite direction to those of the main steering equipment and/or the steering
angle of the front and/or the rear wheels may be adjusted relative to vehicle behaviour.

2.5.2.

For trailers:

2.5.2.1.

2.5.2.2.

2.5.2.3.

‘Self-tracking steering equipment’ means a system designed to create a change of steering angle
on one or more wheels only when acted upon by forces and/or moments applied through the
tyre to road contact.

‘Articulated steering’ means equipment in which the steering forces are produced by a change
in direction of the towing vehicle and in which the movement of the steered trailer wheels is
firmly linked to the relative angle between the longitudinal axis of the towing vehicle and that
of the trailer;

‘Self-steering’ means equipment in which the steering forces are produced by a change in
direction of the towing vehicle and in which the movement of the steered trailer wheels is
firmly linked to the relative angle between the longitudinal axis of the trailer frame or a load
replacing it and the longitudinal axis of the sub-frame to which the axle(s) is (are) attached;

2.5.2.4.

‘Additional steering equipment’ means a system, independent of the main steering system, by
which the steering angle of one or more axle(s) of the steering system can be influenced
selectively for manoeuvring purposes.

2.5.3.

Depending on the arrangement of
equipment are distinguished:

the steered wheels,

the following types of steering

2.5.3.1.

‘Front-wheel steering equipment’ in which only the wheels of the front axle(s) are steered. This
includes all wheels which are steered in the same direction.

2.5.3.2.

‘Rear-wheel steering equipment’ in which only the wheels of the rear axle(s) are steered. This
includes all wheels which are steered in the same direction.

2.5.3.3.

‘Multi-wheel steering equipment’ in which the wheels of one or more of each of the front and
the rear axle(s) are steered;

2.5.3.3.1.

‘All-wheel steering equipment’ in which all the wheels are steered;

2.5.3.3.2.

‘Buckle steering equipment’ in which the movement of chassis parts relative to each other is
directly produced by the steering forces.

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2.6.

Types of steering transmission

Depending on the way the steering forces are transmitted, the following types of steering
transmission are distinguished:

2.6.1.

2.6.2.

2.6.3.

2.6.4.

2.7.

3.

3.1.

3.2.

3.2.1.

3.2.2.

3.2.3.

3.3.

4.

4.1.

‘Purely mechanical steering transmission’ means a steering transmission in which the steering
forces are transmitted entirely by mechanical means.

‘Purely hydraulic steering transmission’ means a steering transmission in which the steering
forces, somewhere in the transmission, are transmitted only by hydraulic means.

‘Purely electric steering transmission’ means a steering transmission in which the steering
forces, somewhere in the transmission, are transmitted only through electric means.

‘Hybrid steering transmission’ means a steering transmission in which part of the steering
forces is transmitted through one and the other part through another of the above mentioned
means. However, in the case where any mechanical part of the transmission is designed only
to give position feedback and is too weak to transmit the total sum of the steering forces, this
system shall be considered to be purely hydraulic or purely electric steering transmission.

‘Electric control
line’ means the electrical connection which provides the steering control
function to the trailer. It comprises the electrical wiring and connector and includes the
parts for data communication and the electrical energy supply for the trailer control trans-
mission.

APPLICATION FOR APPROVAL

The application for approval of a vehicle type with regard to the steering equipment shall be
submitted by the vehicle manufacturer or by his duly accredited representative.

It shall be accompanied by the undermentioned documents in triplicate, and by the following
particulars:

a description of the vehicle type with regard to the items mentioned in paragraph 2.2.; the
vehicle type shall be specified;

a brief description of the steering equipment with a diagram of the steering equipment as a
whole, showing the position on the vehicle of the various devices influencing the steering.

in the case of full power steering systems and systems to which Annex 6 of this Regulation
applies, an overview of the system indicating the philosophy of the system and the fail-safe
procedures, redundancies and warning systems necessary to ensure safe operation in the
vehicle.

The necessary technical files relating to such systems shall be made available for discussion
with the type approval authority and/or technical service. Such files will be discussed on a
confidential basis.

A vehicle representative of the vehicle type to be approved shall be submitted to the technical
service responsible for conducting approval tests.

APPROVAL

the vehicle submitted for approval pursuant

If
relevant
requirements given in this Regulation, approval of that vehicle type with regard to the
steering equipment shall be granted.

to this Regulation meets all

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4.1.1.

4.2.

4.3.

4.4.

4.4.1.

4.4.2.

4.5.

The type approval authority shall verify the existence of satisfactory arrangements for ensuring
effective control of the conformity of production as given in paragraph 7 of this Regulation,
before type approval is granted.

An approval number shall be assigned to each type approved. Its first two digits (at present
01) shall indicate the series of amendments incorporating the most recent major technical
amendments made to the Regulation at
the approval. The same
Contracting Party shall not assign this number to another vehicle type or to the same
vehicle type submitted with different
from that described in the
documents required by paragraph 3.

steering equipment

the time of

issue of

Notice of approval or of extension or refusal of approval of a vehicle type pursuant to this
Regulation shall be communicated to the Parties to the 1958 Agreement which apply this
Regulation, by means of a form conforming to the model in Annex 1 to this Regulation.

There shall be affixed, conspicuously and in a readily accessible place specified on the approval
form, to every vehicle conforming to a vehicle type approved under this Regulation, an
international approval mark consisting of:

a circle surrounding the letter ‘E’ followed by the distinguishing number of the country which
has granted approval (1)

the number of this Regulation, followed by the letter ‘R’, a dash and the approval number to
the right of the circle prescribed in paragraph 4.4.1.

If the vehicle conforms to a vehicle type approved, under one or more other Regulations
annexed to the Agreement, in the country which has granted approval under this Regulation,
the symbol prescribed in paragraph 4.4.1. need not be repeated; in such a case the Regulation
and approval numbers and the additional symbols of all the Regulations under which approval
has been granted in the country which has granted approval under this Regulation shall be
placed in vertical columns to the right of the symbol prescribed in paragraph 4.4.1.

4.6.

The approval mark shall be clearly legible and shall be indelible.

4.7.

The approval mark shall be placed close to or on the vehicle data plate affixed by the
manufacturer.

4.8.

Annex 2 to this Regulation gives examples of arrangements of approval marks.

(1) 1 for Germany, 2 for France, 3 for Italy, 4 for the Netherlands, 5 for Sweden, 6 for Belgium, 7 for Hungary, 8 for the
Czech Republic, 9 for Spain, 10 for Serbia and Montenegro, 11 for the United Kingdom, 12 for Austria, 13 for
Luxembourg, 14 for Switzerland, 15 (vacant), 16 for Norway, 17 for Finland, 18 for Denmark, 19 for Romania, 20
for Poland, 21 for Portugal, 22 for the Russian Federation, 23 for Greece, 24 for Ireland, 25 for Croatia, 26 for
Slovenia, 27 for Slovakia, 28 for Belarus, 29 for Estonia, 30 (vacant), 31 for Bosnia and Herzegovina, 32 for Latvia,
33 (vacant), 34 for Bulgaria, 35 (vacant), 36 for Lithuania, 37 for Turkey, 38 (vacant), 39 for Azerbaijan, 40 for The
former Yugoslav Republic of Macedonia, 41 (vacant), 42 for the European Community (Approvals are granted by its
Member States using their respective ECE symbol), 43 for Japan, 44 (vacant), 45 for Australia, 46 for Ukraine, 47 for
South Africa, 48 for New Zealand, 49 for Cyprus, 50 for Malta and 51 for the Republic of Korea. Subsequent
numbers shall be assigned to other countries in the chronological order in which they ratify or accede to the
Agreement Concerning the Adoption of Uniform Technical Prescriptions for Wheeled Vehicles, Equipment and
Parts which can be Fitted and/or be Used on Wheeled Vehicles and the Conditions for Reciprocal Recognition of
Approvals Granted on the Basis of these Prescriptions, and the numbers thus assigned shall be communicated by the
Secretary-General of the United Nations to the Contracting Parties to the Agreement.

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5.

5.1.

5.1.1.

5.1.2.

5.1.3.

5.1.4.

5.1.5.

5.1.6.

5.1.6.1.

5.1.7.

5.1.7.1.

CONSTRUCTION PROVISIONS

General provisions

The steering system shall ensure easy and safe handling of the vehicle up to its maximum
design speed or in case of a trailer up to its technically permitted maximum speed. There must
be a tendency to self-centre when tested in accordance with paragraph 6.2. with the intact
steering equipment. The vehicle shall meet the requirements of paragraph 6.2. in the case of
motor vehicles and of paragraph 6.3. in the case of trailers. If a vehicle is fitted with an
auxiliary steering system, it shall also meet the requirements of Annex 4. Trailers equipped
with hydraulic steering transmissions shall comply also with Annex 5.

It must be possible to travel along a straight section of road without unusual steering
the
correction by the driver and without unusual vibration in the steering system at
maximum design speed of the vehicle.

The direction of operation of the steering control shall correspond to the intended change of
direction of the vehicle and there shall be a continuous relationship between the steering
control deflection and the steering angle. These requirements do not apply to systems that
incorporate an automatically commanded or corrective steering function, or to auxiliary
steering equipment.

These requirements may also not necessarily apply in the case of full power steering when the
vehicle is stationary and when the system is not energised.

The steering equipment shall be designed, constructed and fitted in such a way that it is
capable of withstanding the stresses arising during normal operation of the vehicle, or combi-
nation of vehicles. The maximum steering angle shall not be limited by any part of the
steering transmission unless
this purpose. Unless otherwise
specified,
it will be assumed that for the purpose of this Regulation, not more than one
failure can occur in the steering equipment at any one time and two axles on one bogie shall
be considered as one axle.

specifically designed for

The effectiveness of the steering equipment, including the electrical control lines, shall not be
adversely affected by magnetic or electric fields. Conformity with the technical requirements of
in force at the time of Type Approval shall be
Regulation No 10, to the amendment
demonstrated.

Advanced driver assistance steering systems shall only be approved in accordance with this
Regulation where the function does not cause any deterioration in the performance of the
basic steering system. In addition they shall be designed such that the driver may, at any time
and by deliberate action, override the function.

Whenever the Automatically Commanded Steering function becomes operational, this shall be
indicated to the driver and the control action shall be automatically disabled if the vehicle
speed exceeds the set limit of 10 km/h by more than 20 per cent or the signals to be
evaluated are no longer being received. Any termination of control shall produce a short
but distinctive driver warning by a visual signal and either an acoustic signal or by imposing a
tactile warning signal on the steering control.

Steering transmission

Adjustment devices for steering geometry must be such that after adjustment a positive
connection can be established between the adjustable components by appropriate locking
devices.

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5.1.7.2.

Steering transmission which can be disconnected to cover different configurations of a vehicle
(e.g. on extendable semi-trailers), must have locking devices which ensure positive relocation
of components; where locking is automatic, there must be an additional safety lock which is
operated manually.

5.1.8.

Steered wheels

The steered wheels shall not be solely the rear wheels. This requirement does not apply to
semi-trailers.

5.1.9.

Energy supply

The same energy supply may be used for the steering equipment and other systems. However
in the case of a failure in any system which shares the same energy supply steering shall be
ensured in accordance with the relevant failure conditions of paragraph 5.3.

5.1.10.

Control systems

The requirements of Annex 6 shall be applied to the safety aspects of electronic vehicle
the steering
control systems that provide or form part of
transmission of
function including advanced driver assistance steering systems. However,
systems or
functions, that use the steering system as the means of achieving a higher level objective,
are subject to Annex 6 only insofar as they have a direct effect on the steering system. If such
systems are provided, they shall not be deactivated during type approval testing of the steering
system.

the control

5.2.

5.2.1.

Special provisions for trailers

Trailers (with the exception of semi-trailers and centre-axle trailers) which have more than one
axle with steered wheels and semi-trailers and centre-axle trailers which have at least one axle
with steered wheels must fulfil the conditions given in paragraph 6.3. However, for trailers
with self-tracking steering equipment a test under paragraph 6.3. is not necessary if the axle
load ratio between the unsteered and the self-tracking axles equals or exceeds 1.6. under all
loading conditions.

However for trailers with self-tracking steering equipment,
the axle load ratio between
unsteered or articulated steered axles and friction-steered axles shall be at least 1 under all
loading conditions.

5.2.2.

If the towing vehicle of a vehicle combination is driving straight ahead, the trailer and towing
vehicle must remain aligned. If alignment is not retained automatically, the trailer must be
equipped with a suitable adjustment facility for maintenance.

5.3.

5.3.1.

5.3.1.1.

Failure provisions and performance

General

For the purposes of this Regulation the steered wheels, the steering control and all mechanical
parts of the steering transmission shall not be regarded as liable to breakage if they are amply
dimensioned, are readily accessible for maintenance, and exhibit safety features at least equal
to those prescribed for other essential components (such as the braking system) of the vehicle.
Where the failure of any such part would be likely to result in loss of control of the vehicle,
that part must be made of metal or of a material with equivalent characteristics and must not
be subject to significant distortion in normal operation of the steering system.

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5.3.1.2.

The requirements of paragraphs 5.1.2., 5.1.3. and 6.2.1. shall also be satisfied with a failure in
the steering equipment as long as the vehicle can be driven with the speeds required in the
respective paragraphs.

In this case paragraph 5.1.3. shall not apply for full power steering systems when the vehicle
is stationary.

5.3.1.3.

5.3.1.4.

5.3.1.5.

Any failure in a transmission other than purely mechanical must clearly be brought to the
attention of the vehicle driver as given in paragraph 5.4. When a failure occurs, a change in
the average steering ratio is permissible if the steering effort given in paragraph 6.2.6. is not
exceeded.

In the case where the braking system of the vehicle shares the same energy source as the
steering system and this energy source fails, the steering system shall have priority and shall be
capable of meeting the requirements of paragraphs 5.3.2. and 5.3.3. as applicable. In addition
the braking performance on the first subsequent application, shall not drop below the
prescribed service brake performance, as given in paragraph 2. of Annex 3 of this Regulation.

In the case where the braking system of the vehicle shares the same energy supply as the
steering system and there is a failure in the energy supply, the steering system shall have
priority and shall be capable of meeting the requirements of paragraphs 5.3.2. and 5.3.3. as
applicable.
In addition the braking performance on the first subsequent application shall
comply with the prescriptions of paragraph 3. of Annex 3 of this Regulation.

5.3.1.6.

In the case of trailers the requirements of paragraphs 5.2.2. and 6.3.4.1. shall also be met
when there is a failure in the steering system.

5.3.2.

5.3.2.1.

5.3.3.

5.3.3.1.

5.3.3.2.

5.3.3.3.

5.3.3.4.

Power assisted steering systems

Should the engine stop or a part of the transmission fail, with the exception of those parts
listed in paragraph 5.3.1.1., there shall be no immediate changes in steering angle. As long as
the vehicle is capable of being driven at a speed greater than 10 km/h the requirements given
in paragraph 6., relating to a system with a failure, shall be met.

Full power steering systems

The system shall be designed such that the vehicle cannot be driven indefinitely at speeds
above 10 km/h where there is any fault which requires operation of the warning signal
referred to in paragraph 5.4.2.1.1.

In case of a failure within the control transmission, with the exception of those parts listed in
paragraph 5.1.4., it shall still be possible to steer with the performance laid down in paragraph
6. for the intact steering system.

In the event of a failure of the energy source of the control transmission, it shall be possible
to carry out at least 24 ‘figure of eight’ manoeuvres, where each loop of the figure is 40 m
diameter at 10 km/h speed and at the performance level given for an intact system in
paragraph 6.

The test manoeuvres shall begin at an energy storage level given in paragraph 5.3.3.5.

In the event of a failure within the energy transmission, with the exception of those parts
listed in paragraph 5.3.1.1., there shall not be any immediate changes in steering angle. As
long as the vehicle is capable of being driven at a speed greater than 10 km/h the
requirements of paragraph 6. for the system with a failure shall be met after the completion
of at least 25 ‘figure of eight’ manoeuvres at 10 km/h minimum speed, where each loop of the
figure is 40 m diameter.

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The test manoeuvres shall begin at an energy storage level given in paragraph 5.3.3.5.

5.3.3.5.

The energy level to be used for the tests referred to in paragraphs 5.3.3.3. and 5.3.3.4. shall be
the energy storage level at which a failure is indicated to the driver.

In the case of electrically powered systems subject to Annex 6, this level shall be the worst
case situation outlined by the manufacturer in the documentation submitted in connection
with Annex 6 and shall take into account the effects of e.g. temperature and ageing on battery
performance.

5.4.

5.4.1.

5.4.1.1.

Warning signals

General provisions

Any fault which impairs the steering function and is not mechanical
signalled clearly to the driver of the vehicle.

in nature must be

Despite the requirements of 5.1.2. the deliberate application of vibration in the steering system
may be used as an additional indication of a fault condition in this system.

In the case of a motor vehicle, an increase in steering force is considered to be a warning
indication; in the case of a trailer, a mechanical indicator is permitted.

5.4.1.2.

If the same energy source is used to supply the steering system and other systems, an acoustic
or optical warning shall be given to the driver, when the stored energy/fluid in the energy/s-
torage reservoir drops to a level liable to cause an increase in steering effort. This warning
may be combined with a device provided to warn of brake failure if the brake system uses the
same energy source. The satisfactory condition of the warning device must be easily verifiable
by the driver.

5.4.2.

Special provisions for full-power steering equipment

5.4.2.1.

Power-driven vehicles shall be capable of providing steering failure and defect warning signals,
as follows:

5.4.2.1.1.

A red warning signal, indicating failures defined in paragraph 5.3.1.3. within the main steering
equipment.

5.4.2.1.2. Where applicable, a yellow warning signal indicating an electrically detected defect within the

steering equipment, which is not indicated by the red warning signal.

5.4.2.1.3.

5.4.2.1.4.

If a symbol
7000-2441 as defined in ISO 2575:2000.

is used,

it must comply with symbol

J 04,

ISO/IEC registration number

The warning signal(s) mentioned above shall light up when the electrical equipment of the
vehicle (and the steering system) is energised. With the vehicle stationary, the steering system
shall verify that none of the specified failures or defects is present before extinguishing the
signal.

Specified failures or defects which should activate the warning signal mentioned above, but
which are not detected under static conditions, shall be stored upon detection and be
displayed at start-up and at all times when the ignition (start) switch is in the ‘on’ (run)
position, as long as the failure persists.

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5.4.3.

5.5.

5.5.1.

5.5.2.

In the case where additional steering equipment is in operation and/or where the steering
angle generated by that equipment has not been returned to normal driving position a
warning signal must be given to the driver.

Provisions for the periodic technical inspection of steering equipment

As far as practicable and subject to agreement between the vehicle manufacturer and the type
approval authority, the steering equipment and its installation shall be so designed that,
without disassembly,
if necessary, commonly used
measuring instruments, methods or test equipment.

its operation can be checked with,

It must be possible to verify in a simple way the correct operational status of those Electronic
Systems, which have control over steering. If special information is needed, this shall be made
freely available.

5.5.2.1.

At the time of Type Approval the means implemented to protect against simple unauthorized
modification to the operation of the verification means chosen by the manufacturer (e.g.
warning signal) shall be confidentially outlined.

Alternatively this protection requirement is fulfilled when a secondary means of checking the
correct operational status is available.

6.

6.1.

TEST PROVISIONS

General provisions

6.1.1.

The test shall be conducted on a level surface affording good adhesion.

6.1.2.

During the test(s), the vehicle shall be loaded to its technically permissible maximum mass and
its technically permissible maximum load on the steered axle(s).

In the case of axles fitted with ASE, this test shall be repeated with the vehicle loaded to its
technically permissible maximum mass and the axle equipped with ASE loaded to its
maximum permissible mass.

Before the test begins, the tyre pressures shall be as prescribed by the manufacturer for the
mass specified in paragraph 6.1.2. when the vehicle is stationary.

In the case of any systems that use electrical energy for part or all of the energy supply, all
performance tests shall be carried out under conditions of actual or simulated electrical load of
all essential systems or systems components which share the same energy supply. Essential
systems shall comprise at least lighting systems, windscreen wipers, engine management and
braking systems.

Provisions for motor vehicles

It must be possible to leave a curve with a radius of 50 m at a tangent without unusual
vibration in the steering equipment at the following speed:

6.1.3.

6.1.4.

6.2.

6.2.1.

Category M1 vehicles: 50 km/h

Category M2, M3, N1, N2 and N3 vehicles: 40 km/h or the maximum design speed if this is
below the speeds given above.

6.2.2.

When the vehicle is driven in a circle with its steered wheels at approximately half lock and a
constant speed of at least 10 km/h, the turning circle must remain the same or become larger
if the steering control is released.

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6.2.3.

During the measurement of control effort, forces with a duration of less than 0.2 seconds
shall not be taken into account.

6.2.4.

The measurement of steering efforts on motor vehicles with intact steering equipment.

6.2.4.1.

The vehicle shall be driven from straight ahead into a spiral at a speed of 10 km/h. The
steering wheel control effort shall be measured at the nominal radius of the steering control
until the position of the steering control corresponds to turning radius given in the table
below for the particular category of vehicle with intact steering. One steering movement shall
be made to the right and one to the left.

6.2.4.2.

The maximum permitted steering time and the maximum permitted steering control effort
with intact steering equipment are given in the table below for each category of vehicle.

6.2.5.

The measurement of steering efforts on motor vehicles with a failure in the steering
equipment.

6.2.5.1.

The test described in paragraph 6.2.4. shall be repeated with a failure in the steering
equipment. The steering effort shall be measured until the position of the steering control
corresponds to the turning radius given in the table below for the particular category of
vehicle with a failure in the steering equipment.

6.2.5.2.

The maximum permitted steering time and the maximum permitted steering control effort
with a failure in the steering equipment are given in the table below for each category of
vehicle.

Table

Steering control effort requirements

Vehicle Category

Maximum
effort
(daN)

M1

M2

M3

N1

N2

N3

15

15

20

20

25

20

Intact

Time
(s)

4

4

4

4

4

4

With a failure

Turning
radius
(m)

Maximum
effort
(daN)

Time
(s)

Turning
radius
(m)

12

12

30

30

12 (**)

45 (*)

12

12

30

40

12 (**)

45 (*)

4

4

6

4

4

6

20

20

20

20

20

20

(*) 50 for rigid vehicles with 2 or more steered axles excluding self tracking equipment
(**) or full lock if 12 m radius is not attainable.

6.3.

6.3.1.

Provisions for trailers

The trailer must
travel without excessive deviation or unusual vibration in its steering
equipment when the towing vehicle is travelling in a straight line on a flat and horizontal
road at a speed of 80 km/h or the technically permissible maximum speed indicated by the
trailer manufacturer if this is less than 80 km/h.

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6.3.2.

6.3.3.

6.3.4.

With the towing vehicle and trailer having adopted a steady state turn corresponding to a
turning circle radius of 25 m (see paragraph 2.4.6.) at a constant speed of 5 km/h, the circle
described by the rearmost outer edge of the trailer shall be measured. This manoeuvre shall be
repeated under the same conditions but at a speed of 25 km/h ± 1 km/h. During these
speed of
manoeuvres,
25 km/h ± 1 km/h shall not move outside the circle described at a constant speed of
5 km/h by more than 0.7 m.

rearmost outer

travelling

edge of

trailer

the

the

at

a

No part of the trailer shall move more than 0.5 m beyond the tangent to a circle with a radius
of 25 m when towed by a vehicle leaving the circular path described in paragraph 6.3.2. along
the tangent and travelling at a speed of 25 km/h. This requirement must be met from the
point the tangent meets the circle to a point 40 m along the tangent. After that point the
trailer shall fulfil the condition specified in paragraph 6.3.1.

The annular ground area swept by the towing vehicle/trailer combination with an intact
steering system, driving at no more than 5 km/h in a constant radius circle with the front
outer corner of the towing vehicle describing a radius of 0.67 x vehicle combination length
but not less than 12.5 m is to be measured.

6.3.4.1.

If, with a fault in the steering system, the measured swept annular width is > 8.3 m, then this
must not be an increase of more than 15 per cent compared with the corresponding value
measured with the intact steering system.

There shall not be any increase in the outer radius of the swept annular width.

6.3.5.

The tests described in paragraphs 6.3.2., 6.3.3. and 6.3.4. shall be conducted in both
clockwise and anti-clockwise directions.

7.

CONFORMITY OF PRODUCTION

The Conformity of Production Procedures shall comply with those set out in the 1958
Agreement, Appendix
following
requirements:

(E/ECE/324–E/ECE/TRANS/505/Rev.2), with

the

2

7.1.

7.2.

8.

8.1.

8.2.

The holder of the approval must ensure that results of the conformity of production tests are
recorded and that
the annexed documents remain available for a period determined in
agreement with the approval authority or technical service. This period must not exceed 10
years counted from the time when production is definitely discontinued.

The type approval authority or technical service which has granted type approval may at any
time verify the conformity control methods applied in each production facility. The normal
frequency of these verifications shall be once every two years.

PENALTIES FOR NON-CONFORMITY OF PRODUCTION

to this Regulation may be
The approval granted in respect of a vehicle type pursuant
withdrawn if
is not complied with or if
laid down in paragraph 7.1.
sample vehicles fail to comply with the requirements of paragraph 6. of this Regulation.

the requirement

If a Contracting Party to the Agreement applying this Regulation withdraws an approval it has
previously granted,
it shall forthwith so notify the other Contracting Parties applying this
Regulation, by means of a communication form conforming to the model in Annex 1 to this
Regulation.

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9.

9.1.

9.1.1.

MODIFICATION AND EXTENSION OF APPROVAL OF THE VEHICLE TYPE

Every modification of the vehicle type shall be notified to the approval authority which
granted the approval. The approval authority may then either:

Consider that the modifications made are unlikely to have an appreciable adverse effect and
that in any case the vehicle 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.

9.3.

Confirmation or extension or refusal of approval, specifying the alterations, shall be commu-
nicated by the procedure specified in paragraph 4.3. to the parties to the Agreement applying
this Regulation.

The approval authority issuing the extension of approval shall assign a series number for such
an extension and inform thereof the other Parties to the 1958 Agreement applying this
in Annex 1 to
Regulation by means of a communication form conforming to the model
this Regulation.

10.

PRODUCTION DEFINITELY DISCONTINUED

If the holder of the approval completely ceases to manufacture a type of vehicle approved in
accordance with this Regulation, he shall so inform the authority which granted the approval.
Upon receiving the relevant communication that authority shall
inform thereof the other
Parties to the 1958 Agreement applying this Regulation by means of a communication
form conforming to the model in Annex 1 to this Regulation.

11.

NAMES AND ADDRESSES OF TECHNICAL SERVICES RESPONSIBLE FOR CONDUCTING APPROVAL
TESTS AND OF ADMINISTRATIVE DEPARTMENTS

The Parties to the 1958 Agreement applying this Regulation shall communicate to the United
Nations Secretariat
the technical services responsible for
conducting approval tests and of the administrative departments which grant approval and
to which forms certifying approval or extension or refusal or withdrawal of approval, issued in
other countries, are to be sent.

the names and addresses of

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ANNEX 1

COMMUNICATION

(Maximum format: A4 (210 × 297 mm))

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ANNEX 2

ARRANGEMENTS OF APPROVAL MARKS

MODEL A

(See paragraph 4.4 of this Regulation)

a = 8 mm min

The above approval mark affixed to a vehicle shows that the vehicle type concerned has, with regard to steering
equipment, been approved in the Netherlands (E4) pursuant to Regulation No 79 under approval No 012439. The
approval number indicates that the approval was granted in accordance with the requirements of Regulation No 79
incorporating the 01 series of amendments.

MODEL B

(See paragraph 4.5 of this Regulation)

a = 8 mm min

The above approval mark affixed to a vehicle shows that the vehicle type concerned has been approved in the Neth-
erlands (E4) pursuant to Regulations Nos 79 and 31 (1). The approval numbers indicate that, at the dates when the
respective approvals were given, Regulation No 79 incorporating the 01 series of amendments and Regulation No 31
included the 01 series of amendments.

(1) The second number is given merely as an example.

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ANNEX 3

Braking performance for vehicles using the same energy source to supply steering equipment and braking device

1.

For tests carried out in accordance with this Annex the following vehicle conditions shall be met:

1.1. The vehicle shall be loaded to its technically permissible maximum mass distributed between the axles as declared by
the vehicle manufacturer. Where provision is made for several arrangements of the mass on the axles, the distri-
bution of the maximum mass between the axles shall be such that the mass on each axle is proportional to the
maximum permissible mass for each axle. In the case of tractors for semi-trailers, the mass may be repositioned
approximately half way between the kingpin position resulting from the above loading conditions and the centreline
of the rear axle(s).

1.2. The tyres shall be inflated to the cold inflation pressure prescribed for the mass to be borne by the tyres when the

vehicle is stationary.

1.3. Before the start of the tests the brakes shall be cold, that is, with a disc or outer brake drum surface temperature less

than 100°C.

2.

If an energy source failure occurs, service braking performance on the first brake application shall achieve the values
given in the table below.

Category

M1

M2 and M3

N1

N2 and N3

V (km/h)

80

60

80

60

m/s2

5,8

5,0

5,0

5,0

FdaN

50

70

70

70

3.

After any failure in the steering equipment, or the energy supply, it shall be possible after eight full stroke actuations
of the service brake control, to achieve at the ninth application, at least the performance prescribed for the
secondary (emergency) braking system (see table below).

In the case where secondary performance requiring the use of stored energy is achieved by a separate control, it shall
still be possible after eight full stroke actuations of the service brake control to achieve at the ninth application, the
residual performance (see table below).

Secondary and residual efficiency

Category

V km/h

Secondary braking m/s2

Residual braking m/s2

M1

M2

M3

N1

N2

N3

80

60

60

70

50

40

2,9

2,5

2,5

2,2

2,2

2,2

1,7

1,5

1,5

1,3

1,3

1,3

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ANNEX 4

Additional provisions for vehicles equipped with ASE

1.

GENERAL PROVISIONS

Vehicles fitted with auxiliary steering equipment (ASE) in addition to the requirements given in the body of this
Regulation shall also comply with the provisions of this Annex.

2.

2.1.

SPECIFIC PROVISIONS

Transmission

2.1.1.

Mechanical steering transmissions

Paragraph 5.3.1.1. of this Regulation applies.

2.1.2.

Hydraulic steering transmissions

The hydraulic steering transmission must be protected from exceeding the maximum permitted service
pressure T.

2.1.3.

Electric steering transmissions

The electric steering transmission must be protected from excess energy supply.

2.1.4.

Combination of steering transmissions

A combination of mechanical, hydraulic and electric transmissions shall comply with the requirements
specified in paragraphs 2.1.1., 2.1.2. and 2.1.3. above.

2.2.

2.2.1.

Testing requirements for failure

Malfunction or failure of any part of the ASE (except for parts not considered to the susceptible to breakdown
as specified in paragraph 5.3.1.1. of this Regulation) shall not result in a sudden significant change in vehicle
behaviour and the relevant requirements of paragraph 6 of this Regulation shall still be met. Furthermore, it
must be possible to control the vehicle without abnormal steering correction. This shall be verified by the
following tests:

2.2.1.1.

Circular test
The vehicle shall be driven into a test circle with a radius ‘R’ m and a speed ‘v’ km/h corresponding to its
category and the values given in the table below:

Vehicle category

M1 and N1

M2 and N2

M3 and N3

R (3)

100

50

50

V (1) (2)

80

50

45

(1) If the ASE is in a mechanically locked position at this specified speed, the test speed will be modified to correspond to the
maximum speed where the system is functioning. Maximum speed means the speed when the ASE becomes locked minus
5 km/h.

(2) If the dimensional characteristics of the vehicle imply an overturning risk, the manufacturer shall provide to the Technical
Service behaviour simulation data demonstrating a lower maximum safe speed for conducting the test. Then the Technical
Service will choose this test speed.

(3) If, due to the configuration of the test site, the values of the radii cannot be observed, the tests may be carried out on tracks
with other radii, (maximum variation: ± 25 per cent) provided that the speed is varied to obtain the transverse acceleration
resulting from the radius and speed indicated in the table for the particular category of vehicle.

The failure shall be introduced when the specified test speed has been reached. The test shall include driving in
a clockwise direction, and in a counter-clockwise direction.

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2.2.1.2.

Transient test

2.2.1.2.1. Until uniform test procedures have been agreed, the vehicle manufacturer shall provide the technical services
with their test procedures and results for transient behaviour of the vehicle in the case of failure.

2.3.

2.3.1.

Warning signals in case of failure

Except for parts of ASE not considered susceptible to breakdown as specified in paragraph 5.3.1.1. of this
Regulation, the following failure of ASE shall be clearly brought to the attention of the driver.

2.3.1.1. A general cut-off of the ASE electrical or hydraulic control.

2.3.1.2.

Failure of the ASE energy supply.

2.3.1.3. A break in the external wiring of the electrical control if fitted.

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ANNEX 5

Provisions for trailers having hydraulic steering transmissions

1.

GENERAL PROVISIONS

Vehicles fitted with hydraulic steering transmission, in addition to the requirements given in the body of this
Regulation shall also comply with the provisions of this Annex.

2.

SPECIFIC PROVISIONS

2.1.

Performance of hydraulic lines and hose assemblies.

2.1.1. The hydraulic lines of hydraulic transmission shall be capable of a burst pressure at least four times the maximum
normal service pressure (T) specified by the vehicle manufacturer. Hose assemblies shall comply with ISO
Standards 1402:1994, 6605:1986 and 7751: 1991.

2.2.

In systems dependent on an energy supply.

2.2.1. The energy supply must be protected from excess pressure by a pressure limiting valve which operates at the

pressure T.

2.3.

Protection of steering transmission.

2.3.1. The steering transmission must be protected from excess pressure by a pressure limiting valve which operates at

between 1,5 T and 2,2 T.

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ANNEX 6

Special requirements to be applied to the Safety Aspects of Complex Electronic Vehicle Control Systems

1.

GENERAL

This Annex defines the special requirements for documentation, fault strategy and verification with respect to the
safety aspects of Complex Electronic Vehicle Control Systems (paragraph 2.3 below) as far as this Regulation is
concerned.

This Annex may also be called, by special paragraphs in this Regulation, for safety related functions which are
controlled by electronic system(s).

This Annex does not specify the performance criteria for ‘The System’ but covers the methodology applied to the
design process and the information which must be disclosed to the technical service, for type approval purposes.

This information shall show that ‘The System’ respects, under normal and fault conditions, all the appropriate
performance requirements specified elsewhere in this Regulation.

2.

DEFINITIONS

For the purposes of this Annex,

2.1.

2.2.

‘Safety concept’ is a description of the measures designed into the system, for example within the electronic units,
so as to address system integrity and thereby ensure safe operation even in the event of an electrical failure. The
possibility of a fall-back to partial operation or even to a back-up system for vital vehicle functions may be a part
of the safety concept.

‘Electronic control system’ means a combination of units, designed to co-operate in the production of the stated
vehicle control function by electronic data processing. Such systems, often controlled by software, are built from
discrete functional components such as sensors, electronic control units and actuators and connected by trans-
‘The System’,
mission links. They may include mechanical, electro-pneumatic or electro-hydraulic elements.
referred to herein, is the one for which type approval is being sought.

2.3.

‘Complex electronic vehicle control systems’ are those electronic control systems which are subject to a hierarchy
of control
in which a controlled function may be over-ridden by a higher level electronic control system/-
function.

A function which is over-ridden becomes part of the complex system.

2.4.

‘Higher-Level control’ systems/functions are those which employ additional processing and/or sensing provisions
to modify vehicle behaviour by commanding variations in the normal function(s) of the vehicle control system.

This allows complex systems to automatically change their objectives with a priority which depends on the
sensed circumstances.

2.5.

‘Units’ are the smallest divisions of system components which will be considered in this Annex, since these
combinations of components will be treated as single entities for purposes of identification, analysis or replace-
ment.

2.6.

‘Transmission links’ are the means used for inter-connecting distributed units for the purpose of conveying
signals, operating data or an energy supply.

This equipment is generally electrical but may, in some part, be mechanical, pneumatic or hydraulic.

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2.7.

2.8.

3.

3.1.

‘Range of control’ refers to an output variable and defines the range over which the system is likely to exercise
control.

‘Boundary of functional operation’ defines the boundaries of the external physical limits within which the system
is able to maintain control.

DOCUMENTATION

Requirements
The manufacturer shall provide a documentation package which gives access to the basic design of ‘The System’
and the means by which it is linked to other vehicle systems or by which it directly controls output variables.

The function(s) of ‘The System’ and the safety concept, as laid down by the manufacturer, shall be explained.

Documentation shall be brief, yet provide evidence that the design and development has had the benefit of
expertise from all the system fields which are involved.

For periodic technical inspections, the documentation shall describe how the current operational status of ‘The
System’ can be checked.

3.1.1. Documentation shall be made available in two parts:

(a)

the formal documentation package for the approval, containing the material listed in paragraph 3. (with the
exception of that of paragraph 3.4.4) which shall be supplied to the technical service at the time of
submission of the type approval application. This will be taken as the basic reference for the verification
process set out in paragraph 4. of this Annex;

(b) additional material and analysis data of paragraph 3.4.4 which shall be retained by the manufacturer, but

made open for inspection at the time of type approval.

3.2.

Description of the functions of ‘The System’
A description shall be provided which gives a simple explanation of all the control functions of ‘The System’ and
the methods employed to achieve the objectives, including a statement of the mechanism(s) by which control is
exercised.

3.2.1. A list of all input and sensed variables shall be provided and the working range of these defined.

3.2.2. A list of all output variables which are controlled by ‘The System’ shall be provided and an indication given, in
each case, of whether the control is direct or via another vehicle system. The range of control (paragraph 2.7)
exercised on each such variable shall be defined.

3.2.3.

Limits defining the boundaries of functional operation (paragraph 2.8) shall be stated where appropriate to
system performance.

3.3.

System layout and schematics

3.3.1.

Inventory of components
A list shall be provided, collating all the units of ‘The System’ and mentioning the other vehicle systems which
are needed to achieve the control function in question.

An outline schematic showing these units in combination, shall be provided with both the equipment distri-
bution and the interconnections made clear.

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3.3.2.

Functions of the units
The function of each unit of ‘The System’ shall be outlined and the signals linking it with other units or with
other vehicle systems shall be shown. This may be provided by a labelled block diagram or other schematic, or
by a description aided by such a diagram.

3.3.3.

Interconnections
Interconnections within ‘The System’ shall be shown by a circuit diagram for the electric transmission links, by a
piping diagram for pneumatic or hydraulic transmission equipment and by a simplified diagrammatic layout for
mechanical linkages.

3.3.4.

Signal flow and priorities

There shall be a clear correspondence between these transmission links and the signals carried between Units.

Priorities of signals on multiplexed data paths shall be stated wherever priority may be an issue affecting
performance or safety as far as this Regulation is concerned.

3.3.5.

Identification of units

Each unit shall be clearly and unambiguously identifiable (e.g. by marking for hardware and marking or software
output for software content) to provide corresponding hardware and documentation association.

Where functions are combined within a single unit or indeed within a single computer, but shown in multiple
blocks in the block diagram for clarity and ease of explanation, only a single hardware identification marking
shall be used.

The manufacturer shall, by the use of this identification, affirm that the equipment supplied conforms to the
corresponding document.

3.3.5.1. The identification defines the hardware and software version and, where the latter changes such as to alter the
function of the Unit as far as this Regulation is concerned, this identification shall also be changed.

3.4.

3.4.1.

Safety concept of the manufacturer
The manufacturer shall provide a statement which affirms that the strategy chosen to achieve ‘The System’
objectives will not, under non-fault conditions, prejudice the safe operation of systems which are subject to the
prescriptions of this Regulation.

3.4.2.

In respect of software employed in ‘The System’, the outline architecture shall be explained and the design
methods and tools used shall be identified. The manufacturer shall be prepared,
if required, to show some
evidence of the means by which they determined the realisation of the system logic, during the design and
development process.

3.4.3.

The Manufacturer shall provide the technical authorities with an explanation of the design provisions built into
‘The System’ so as to generate safe operation under fault conditions. Possible design provisions for failure in ‘The
System’ are for example:

(a)

fall-back to operation using a partial system;

(b) change-over to a separate back-up system;

(c) removal of the high level function.

27.5.2008

EN

Official Journal of the European Union

L 137/51

In case of a failure, the driver shall be warned for example by warning signal or message display. When the
system is not deactivated by the driver, e.g. by turning the ignition (run) switch to ‘off’, or by switching off that
particular function if a special switch is provided for that purpose, the warning shall be present as long as the
fault condition persists.

3.4.3.1. If the chosen provision selects a partial performance mode of operation under certain fault conditions, then these

conditions shall be stated and the resulting limits of effectiveness defined.

3.4.3.2. If the chosen provision selects a second (back-up) means to realise the vehicle control system objective, the
principles of the change-over mechanism, the logic and level of redundancy and any built in back-up checking
features shall be explained and the resulting limits of back-up effectiveness defined.

3.4.3.3. If the chosen provision selects the removal of the Higher Level Function, all the corresponding output control
signals associated with this function shall be inhibited, and in such a manner as to limit the transition
disturbance.

3.4.4.

The documentation shall be supported, by an analysis which shows, in overall terms, how the system will behave
on the occurrence of any one of those specified faults which will have a bearing on vehicle control performance
or safety.

This may be based on a Failure Mode and Effect Analysis (FMEA), a Fault Tree Analysis (FTA) or any similar
process appropriate to system safety considerations.

The chosen analytical approach(es) shall be established and maintained by the Manufacturer and shall be made
open for inspection by the technical service at the time of the type approval.

3.4.4.1. This documentation shall itemize the parameters being monitored and shall set out, for each fault condition of
the type defined in paragraph 3.4.4 of this Annex, the warning signal to be given to the driver and/or to
service/technical inspection personnel.

4.

4.1.

VERIFICATION AND TEST
The functional operation of ‘The System’, as laid out in the documents required in paragraph 3, shall be tested as
follows:

4.1.1.

Verification of the function of ‘The System’

As the means of establishing the normal operational levels, verification of the performance of the vehicle system
under non-fault conditions shall be conducted against the manufacturer's basic benchmark specification unless
this is subject to a specified performance test as part of the approval procedure of this or another Regulation.

4.1.2.

Verification of the safety concept of paragraph 3.4
The reaction of ‘The System’ shall, at the discretion of the type approval authority, be checked under the
influence of a failure in any individual unit by applying corresponding output signals to electrical units or
mechanical elements in order to simulate the effects of internal faults within the unit.

4.1.2.1. The verification results shall correspond with the documented summary of the failure analysis, to a level of

overall effect such that the safety concept and execution are confirmed as being adequate.