ISO 13674-1:2023

Road vehicles - Test method for the quantification of on-centre handling - Part 1: Weave test

This document specifies a test schedule that addresses a particular aspect of the on-centre handling characteristics of a vehicle: the weave test. It is applicable to passenger cars in accordance with ISO 3833, and to light trucks. NOTE The manoeuvre specified in this test method is not representative of real driving conditions but is useful for obtaining measures of vehicle on-centre handling behaviour in response to a specific type of steering input under closely controlled test conditions. Other aspects of on-centre handling are addressed in the companion ISO 13674-2.

Véhicules routiers — Méthode d'essai pour la quantification du centrage — Partie 1: Essai en petite sinusoïde au volant

General Information

• Status: Published
• Publication Date: 07-Nov-2023
• ICS: 43.020 - Road vehicles in general
• Technical Committee: ISO/TC 22/SC 33 - Vehicle dynamics and chassis components
• Drafting Committee: ISO/TC 22/SC 33 - Vehicle dynamics and chassis components
• Current Stage: 6060 - International Standard published
• Start Date: 08-Nov-2023
• Due Date: 21-Jun-2024
• Completion Date: 08-Nov-2023

Relations

• Revises: ISO 13674-1:2010 - Road vehicles - Test method for the quantification of on-centre handling - Part 1: Weave test
• Effective Date: 06-Jun-2022

Overview

ISO 13674-1:2023 - Road vehicles - Test method for the quantification of on-centre handling - Part 1: Weave test - defines a repeatable, laboratory-style procedure to quantify a specific aspect of vehicle on‑centre handling. Applicable to passenger cars (per ISO 3833) and light trucks, the standard prescribes a controlled weave steering input while the vehicle travels in a nominally straight line at constant forward speed. Results are intended to provide discriminatory measurements of steering feel, hysteresis and transient response under closely controlled test conditions (not to represent typical real‑world driving).

Key Topics

• Test principle: Drive in a nominally straight line with a defined weave steering input to record driver inputs and vehicle responses.
• Measured variables: Steering-wheel angle (δ), steering-wheel torque (M), yaw velocity (dψ/dt), longitudinal velocity (v), plus recommended measurement of lateral acceleration (a) and steering-wheel angular velocity (dδ/dt).
• Measurement accuracy: Typical operating ranges and recommended maximum combined transducer + recording errors are specified (e.g., steering-wheel angle ±50° ±0.1°, steering-wheel torque ±0.1 N·m ±0.1 N·m, yaw velocity ±10°/s ±0.1°/s, lateral acceleration ±5 m/s² ±0.1 m/s²).
• Data processing and outputs: Time histories, hysteresis loops and characteristic plots (e.g., torque vs. angle, yaw rate vs. angle, lateral acceleration vs. angle) with defined metrics such as abscissa/ordinate deadband and hysteresis gradients.
• Test conditions and equipment: Requirements for transducer installation, multi-channel data recording, recommended test track and environmental controls (wind, surface); see ISO 15037-1 for general vehicle dynamics test conditions.
• Limitations: The weave manoeuvre is deliberately artificial - useful for isolating on‑centre handling behaviour but not representative of everyday driving.

Applications

• Vehicle dynamics engineering: quantify steering feel, tuning of steering systems, suspension and tyre development.
• Quality control and benchmarking: produce repeatable metrics for production validation and competitive comparison.
• Research and development: investigate the effects of steering system changes, tyre characteristics, loading conditions and control strategies on on‑centre behaviour.
• Test labs and OEMs: engineers, vehicle test specialists and validation teams use ISO 13674-1:2023 for standardized on‑centre handling evaluation.

Who should use it

• Automotive OEMs, component suppliers (steering, tyres, chassis), independent test laboratories, and vehicle dynamics researchers seeking standardized, repeatable procedures for evaluating on‑centre handling via the weave test.

Related standards

• ISO 3833 (vehicle types/definitions)
• ISO 8855 (vehicle dynamics vocabulary)
• ISO 15037-1:2019 (general vehicle dynamics test conditions)
• ISO 1176, ISO 2416 (masses and mass distribution)
• Companion: ISO 13674-2 (other aspects of on‑centre handling)

Keywords: ISO 13674-1:2023, weave test, on-centre handling, vehicle dynamics test method, steering behaviour, road vehicles, passenger cars, light trucks.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 13674-1
Third edition
2023-11
Road vehicles — Test method for
the quantification of on-centre
handling —
Part 1:
Weave test
Véhicules routiers — Méthode d'essai pour la quantification du
centrage —
Partie 1: Essai en petite sinusoïde au volant
Reference number
© 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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or ISO’s member body in the country of the requester.
ISO copyright office
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Published in Switzerland
ii
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
5.1 Reference system . 2
5.2 Variables to be measured . 2
6 Measuring equipment . 3
6.1 Description . 3
6.2 Transducer installations . 3
6.3 Data processing. 3
7 Test conditions .3
7.1 General . 3
7.2 Test track . 3
7.3 Wind velocity . 4
7.4 Test vehicle . 4
7.4.1 General data . . . 4
7.4.2 Tyres . 4
7.4.3 Operating components . 4
7.4.4 Loading conditions of vehicle . 4
8 Procedure .5
8.1 Warm-up . 5
8.2 Initial driving condition . 5
8.3 Weave test procedure . 5
9 Data evaluation and presentation of results . 6
9.1 General . 6
9.2 Time histories . 6
9.3 Characteristic values . 6
9.3.1 General . 6
9.3.2 Steering-wheel torque versus steering-wheel angle (M versus δ ) . 8
H H
9.3.3 Yaw velocity versus steering-wheel angle (dψ/dt versus δ ). 8
H
9.3.4 Yaw velocity versus steering-wheel torque (dψ/dt versus M ) . . 8
H
9.3.5 Lateral acceleration versus steering-wheel angle (a versus δ ) .
Y H
............................................................................................................................................................................................................ 8
9.3.6 Steering-wheel torque versus lateral acceleration (M versus a ) . 8
H Y
Bibliography .10
iii
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
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
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described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use
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www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 33,
Vehicle dynamics, chassis components and driving automation systems testing.
This third edition cancels and replaces the second edition (ISO 13674:2010), which has been technically
revised.
The main changes are as follows:
— references have been updated to ISO 15037-1:2019 and deleted reference to ISO/TS 20119:2002;
— corrected the key for the abscissa and ordinate dead band in Figure 1;
— removed calculated lateral acceleration to calculate lateral acceleration metrics;
— corrected incomplete steering hysteresis calculation.
A list of all parts in the ISO 13674 series can be found on the ISO website.
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.
iv
Introduction
The main purpose of this document is to provide repeatable and discriminatory test results.
The dynamic behaviour of a road vehicle is a very important aspect of active vehicle safety. Any given
vehicle, together with its driver and the prevailing environment, constitutes a closed-loop system that
is unique. The task of evaluating the dynamic behaviour is therefore, very difficult since the significant
interaction of these driver-vehicle-environment elements are each complex in themselves. A complete
and accurate description of the behaviour of the road vehicle necessarily involves information obtained
from a number of different tests.
Since this test method quantifies only one small part of the complete vehicle handling characteristics,
the results of these tests can only be considered significant for a correspondingly small part of the
overall dynamic behaviour.
Moreover, insufficient knowledge is available concerning the relationship between overall vehicle
dynamic properties and accident avoidance. A substantial amount of work 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. Consequently, for any application of this
test method for regulation purposes, proven correlation between test results and accident statistics is
important.
v
INTERNATIONAL STANDARD ISO 13674-1:2023(E)
Road vehicles — Test method for the quantification of on-
centre handling —
Part 1:
Weave test
1 Scope
This document specifies a test schedule that addresses a particular aspect of the on-centre handling
characteristics of a vehicle: the weave test. It is applicable to passenger cars in accordance with
ISO 3833, and to light trucks.
NOTE The manoeuvre specified in this test method is not representative of real driving conditions but is
useful for obtaining measures of vehicle on-centre handling behaviour in response to a specific type of steering
input under closely controlled test conditions. Other aspects of on-centre handling are addressed in the
companion ISO 13674-2.
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 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 15037-1:2019, Road vehicles — Vehicle dynamics test methods — Part 1: General conditions for
passenger cars
3 Terms, definitions, and symbols
For the purposes of this document, the terms and definitions given in ISO 1176, ISO 2416, ISO 3833,
ISO 8855 and the following 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
on-centre handling
description of the steering “feel” and precision of a vehicle during nominally straight-line driving and in
negotiating large radius bends at high speeds but low lateral accelerations
3.2
ordinate deadband
vertical width of the hysteresis loops at abscissa zero
3.3
abscissa deadband
horizontal width of the hysteresis loops at ordinate zero
3.4
gradient
ratio of change in the ordinate with respect to a unit change in the abscissa, evaluated on each side of
the hysteresis loop
4 Principle
On-centre handling represents that part of the straight-line directional stability characteristics of the
vehicle existing 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 document defines a test schedule that involves driving the vehicle in a nominally straight line
at a constant forward speed. 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 vehicle behaviour in a test-specific driving situati
...