Road vehicles — Heavy commercial vehicles and buses — Calculation method for steady-state rollover threshold

This document describes a method for calculating steady-state rollover threshold of heavy commercial vehicles and buses, not considering the effects of active control systems. The calculation method considers the main factors that influence the rollover threshold, namely the height of centre of gravity, the track, the tyre lateral stiffness, and all factors that affect the vehicle roll stiffness. The considered compliances (e.g. tyre deformation) have a considerable influence on the effective track, and consequently on the steady-state rollover threshold. NOTE As an alternative to the described calculation method standard, the steady-state rollover threshold can be measured on a test track or with a tilt-table test as described in ISO 16333.

Véhicules routiers — Véhicules utilitaires lourds et bus — Méthode de calcul du seuil de renversement en régime permanent

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Status
Published
Publication Date
09-Jan-2023
Current Stage
6060 - International Standard published
Due Date
03-Jan-2023
Completion Date
10-Jan-2023
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ISO 22135:2023 - Road vehicles — Heavy commercial vehicles and buses — Calculation method for steady-state rollover threshold Released:10. 01. 2023
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INTERNATIONAL ISO
STANDARD 22135
First edition
2023-01
Road vehicles — Heavy commercial
vehicles and buses — Calculation
method for steady-state rollover
threshold
Véhicules routiers — Véhicules utilitaires lourds et bus — Méthode de
calcul du seuil de renversement en régime permanent
Reference number
ISO 22135:2023(E)
© ISO 2023
---------------------- Page: 1 ----------------------
ISO 22135:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

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© ISO 2023 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 22135:2023(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction .................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 Properties ................................................................................................................................................................................................................... 4

4.1 Vehicle properties used for calculation ............................................................................................................................ 4

4.2 Required parameter accuracy .................................................................................................................................................. 5

5 Principle ........................................................................................................................................................................................................................ 5

6 Calculation method ........................................................................................................................................................................................... 6

6.1 General ........................................................................................................................................................................................................... 6

6.2 Calculation of vehicle effective track .................................................................................................................................. 6

6.3 Calculation of vehicle roll stiffness....................................................................................................................................... 7

6.4 Calculation of vehicle effective tyre lateral stiffness ........................................................................................... 7

6.5 Calculation of steady-state rollover threshold ........................................................................................................... 7

Annex A (informative) Sample results ............................................................................................................................................................... 9

Bibliography .............................................................................................................................................................................................................................10

iii
© ISO 2023 – All rights reserved
---------------------- Page: 3 ----------------------
ISO 22135:2023(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

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the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see

www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 33,

Vehicle dynamics and chassis components.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www.iso.org/members.html.
© ISO 2023 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 22135:2023(E)
Introduction

The dynamic behaviour of a road vehicle is a most important aspect of active vehicle safety. Any given

vehicle, together with its driver and the prevailing environment constitutes a closed-loop system which

is unique. The task of evaluating the dynamic behaviour is therefore very difficult, since the significant

interaction of these driver-vehicle road elements are each complex in themselves. A complete and

accurate description of the behaviour of the road vehicle inevitably involves information obtained from

a number of different tests.

Moreover, insufficient knowledge is available to correlate overall vehicle dynamic properties with

accident prevention. A substantial amount of work is necessary to acquire sufficient and reliable data

on the correlation between accident prevention and vehicle dynamic properties in general.

© ISO 2023 – All rights reserved
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 22135:2023(E)
Road vehicles — Heavy commercial vehicles and buses —
Calculation method for steady-state rollover threshold
1 Scope

This document describes a method for calculating steady-state rollover threshold of heavy commercial

vehicles and buses, not considering the effects of active control systems. The calculation method

considers the main factors that influence the rollover threshold, namely the height of centre of

gravity, the track, the tyre lateral stiffness, and all factors that affect the vehicle roll stiffness. The

considered compliances (e.g. tyre deformation) have a considerable influence on the effective track, and

consequently on the steady-state rollover threshold.

NOTE As an alternative to the described calculation method standard, the steady-state rollover threshold

can be measured on a test track or with a tilt-table test as described in ISO 16333.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 8855, Road vehicles — Vehicle dynamics and road-holding ability — Vocabulary
3 Terms and definitions

For the purposes of this document, the terms and definitions given in in ISO 8855 and the following

shall apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
steady-state rollover threshold
srt

maximum lateral acceleration that the vehicle can sustain in a steady state turn without rolling over

3.2
first lift-off lateral acceleration
lateral acceleration, at which the first wheel lift-off occurs
3.3
total lift-off lateral acceleration
lateral acceleration, at which theoretically all axles lift from the ground
© ISO 2023 – All rights reserved
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ISO 22135:2023(E)
3.4
track

distance between the contact centres on a single wheel axle, measured parallel to the Y axis, with the

vehicle at rest on a horizontal surface

Note 1 to entry: For dual wheel axles, it is the distance between the points centrally located between the contact

centres of the inner and outer dual wheels.
3.5
equivalent track
track (3.4) for a dual wheel axle
Note 1 to entry: For single wheel axles, equivalent track is equal to the track.
3.6
kingpin representative track

representative track (3.4) for the kingpin of a semitrailer, used for calculation of vehicle effective track

(3.7)
3.7
vehicle
...

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