ISO/TS 20119:2002

Road vehicles — Test method for the quantification of on-centre handling — Determination of dispersion metrics for straight-line driving

ISO/TS 20119:2002 specifies a test schedule that addresses certain aspects of the on-centre handling characteristics of a vehicle, on-centre handling being used to describe the steering "feel" and precision of the vehicle during nominally straight-line driving and in negotiating large-radius bends at high speeds but low lateral accelerations. It is applicable to passenger cars in accordance with ISO 3833, and to light trucks.

Véhicules routiers — Méthodes d'essai pour la quantification de la stabilité sur l'axe — Détermination de la dispersion métrique pour la conduite en ligne droite

General Information

• Status: Withdrawn
• Publication Date: 23-Oct-2002
• Withdrawal Date: 23-Oct-2002
• ICS: 43.100 - Passenger cars. Caravans and light trailers
• Technical Committee: ISO/TC 22 - Road vehicles
• Drafting Committee: ISO/TC 22 - Road vehicles
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 06-Dec-2012

Standards Content (Sample)

TECHNICAL ISO/TS
SPECIFICATION 20119
First edition
2002-11-01

Road vehicles — Test method for the
quantification of on-centre handling —
Determination of dispersion metrics for
straight-line driving
Véhicules routiers — Méthodes d'essai pour la quantification de la stabilité
sur l'axe — Détermination de la dispersion métrique pour la conduite en
ligne droite




Reference number
ISO/TS 20119:2002(E)
©
ISO 2002

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ISO/TS 20119:2002(E)
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ISO/TS 20119:2002(E)
Contents Page
Foreword . iv
Introduction. v
1 Scope. 1
2 Normative references. 1
3 Terms, definitions and symbols . 1
4 Principle . 2
5 Variables . 2
6 Measuring equipment . 3
7 Test conditions. 3
8 Test procedure . 5
9 Data evaluation and presentation of results . 6
Bibliography. 8

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ISO/TS 20119:2002(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
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Commission (IEC) on all matters of electrotechnical standardization.
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In other circumstances, particularly when there is an urgent market requirement for such documents, a technical
committee may decide to publish other types of normative document:
 an ISO Publicly Available Specification (ISO/PAS) represents an agreement between technical experts in an
ISO working group and is accepted for publication if it is approved by more than 50 % of the members of the
parent committee casting a vote;
 an ISO Technical Specification (ISO/TS) represents an agreement between the members of a technical
committee and is accepted for publication if it is approved by 2/3 of the members of the committee casting a
vote.
An ISO/PAS or ISO/TS is reviewed after three years with a view to deciding whether it should be confirmed for a
further three years, revised to become an International Standard, or withdrawn. In the case of a confirmed ISO/PAS
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Standard or withdrawn.
Attention is drawn to the possibility that some of the elements of this Technical Specification may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO/TS 20119 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 9, Vehicle
dynamics and road-holding ability.

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ISO/TS 20119:2002(E)
Introduction
The dynamic behaviour of a road vehicle is a most important part of active vehicle safety. Any given vehicle,
together with its driver and the prevailing environment, forms a unique closed-loop system. The task of evaluating
the dynamic behaviour is therefore very difficult because of the significant interaction of these driver–vehicle–road
elements, each of which is in itself complex. A complete and accurate description of the behaviour of the road
vehicle must necessarily involve information obtained from a number of tests of different types.
Because they quantify only a small part of the whole handling field, the results of these tests can be considered
significant only for a correspondingly small part of the overall dynamic behaviour.
Moreover, insufficient knowledge is available concerning the relationship between accident avoidance and the
dynamic characteristics evaluated by these tests. A substantial amount of effort is necessary to acquire sufficient
and reliable data on the correlation between accident avoidance and vehicle dynamic properties in general and the
results of these tests in particular.
Therefore it is not possible to use these methods and test results for regulation purposes at present. The best that
can be expected is that these on-centre handling tests are used as some among many other tests, which together
describe an important part of the field of vehicle dynamic behaviour.
Finally, the role of the tyres is important and test results can be strongly influenced by the type and condition of
tyres.

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TECHNICAL SPECIFICATION ISO/TS 20119:2002(E)

Road vehicles — Test method for the quantification of on-centre
handling — Determination of dispersion metrics for straight-line
driving
1 Scope
This Technical Specification specifies a test schedule that addresses certain aspects of the on-centre handling
characteristics of a vehicle, on-centre handling being used to describe the steering “feel” and precision of the
vehicle during nominally straight-line driving and in negotiating large-radius bends at high speeds but low lateral
accelerations. It is applicable to passenger cars in accordance with ISO 3833, and to light trucks.
NOTE The manoeuvres specified are not necessarily representative of real driving conditions but are useful for obtaining
measures of vehicle on-centre handling behaviour in response to several specific types of steering input under closely controlled
test conditions. Other aspects of on-centre handling are addressed in the companion ISO 13674-1 and ISO 13674-2 (under
preparation).
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this Technical Specification. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this Technical Specification are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
ISO 1176, Road vehicles — Masses — Vocabulary and codes
ISO 2416, Passenger cars — Mass distribution
ISO 3833, Road vehicles — Types — Terms and definitions
ISO 8855, Road vehicles — Vehicle dynamics and road-holding ability — Vocabulary
ISO 15037-1:1998, Road vehicles — Vehicle dynamics test methods — Part 1: General conditions for passenger
cars
3 Terms, definitions and symbols
For the purposes of this Technical Specification, the terms, definitions and symbols given in ISO 1176, ISO 2416,
ISO 3833 and ISO 8855 apply.
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ISO/TS 20119:2002(E)
4 Principle
On-centre handling represents that part of the straight-line directional stability characteristics of the vehicle existing
2
at lateral acceleration levels typically no greater than 1 m/s . On-centre handling is concerned primarily with
features that directly influence the driver’s steering input, such as steering system and tyre characteristics. Thus
test schedules for the evaluation of on-centre handling behaviour seek to minimize other factors that influence the
wider aspects of straight-line directional stability, such as disturbance inputs due to ambient winds and road
irregularities.
This Technical Specification defines a test schedule that involves driving the vehicle in a nominally straight line at a
constant forward speed. Because this is a closed-loop test procedure, the results are driver-dependent. For this
reason it is essential that all vehicles or vehicle configurations be tested using the same driver or drivers. During
the test, driver inputs and vehicle responses are measured and recorded. From the recorded signals, characteristic
values are calculated.
5 Variables
5.1 Reference system
The variables of motion used to describe the vehicle behaviour in a test-specific driving situation relate to the
intermediate axis system, X, Y, Z (see ISO 8855).
The location of the origin of the vehicle axis system, X , Y , Z , is the reference point and thus should be
V V V
independent of the loading condition. The origin is therefore fixed in the longitudinal plane of symmetry at half-
wheelbase and at the same height above ground as the centre of gravity of the vehicle at complete vehicle kerb
mass (see ISO 1176).
5.2 Variables to be measured
When performing this test procedure, the following variables shall be measured:
 steering-wheel angle, δ ;
H
dψ
 yaw velocity, ;
dt
 longitudinal velocity, v .
X
The following variables should also be measured:
dδ
H
 steering-wheel
...