BS ISO 4138:2021

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Passenger cars. Steady-state circular driving behaviour. Open-loop test methods

Published By	Publication Date	Number of Pages
BSI	2021	30

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Description

This document specifies open-loop test methods for determining the steady-state circular driving behaviour of passenger cars as defined in ISO 3833 and of light trucks, such behaviour being one of the factors comprising vehicle dynamics and road-holding properties. The open-loop manoeuvres included in these methods are not representative of real driving conditions, but are nevertheless useful for obtaining measures of vehicle steady-state behaviour resulting from several specific types of control inputs under closely controlled test conditions.

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PDF Pages	PDF Title
2	National foreword
6	Foreword
7	Introduction
9	1 Scope 2 Normative references 3 Terms and definitions 4 Principle 4.1 Test methods
10	4.2 Equivalence of test methods 5 Variables 5.1 Reference system 5.2 Measurement
11	6 Measuring equipment 6.1 Description 6.2 Transducer installation 6.3 Data processing 7 Test conditions
12	8 Test procedure 8.1 Warm-up 8.2 Initial driving condition 8.3 General test description 8.4 Method 1 — Constant radius 8.4.1 Description
13	8.4.2 Procedure 8.5 Method 2 — Constant steering-wheel angle 8.5.1 Description 8.5.2 Procedure
14	8.6 Method 3 — Constant speed 8.6.1 Description 8.6.2 Procedure
15	9 Data analysis 9.1 General 9.2 Lateral acceleration
16	9.3 Path radius 10 Data evaluation and presentation of results 10.1 General 10.2 Plotted results (see also Annex A) 10.3 Evaluation of characteristic values 10.3.1 General
17	10.3.2 Evaluation of gradients — Differentiation
18	10.3.3 Normalization of results — Comparison of results from different vehicles
19	10.3.4 Normalized steady-state properties
21	Annex A (normative) Presentation of results
27	Annex B (normative) Determination of overall (static) steering ratio
28	Annex C (informative) General information — Theoretical basis for the test methods
29	Bibliography

Additional information

Status	Definitive
Pages	30
Publication Date	2021-10-12
ISBN	978 0 539 15370 5
Standard Number	BS ISO 4138:2021
Title	Passenger cars. Steady-state circular driving behaviour. Open-loop test methods
Identical National Standard Of	ISO 4138:2021
Replaces	BS ISO 4138:2012
Descriptors	Dynamics, Motor vehicles, Rotational motion, Road vehicles, Steering control devices, Commercial road vehicles, Road safety, Private cars, Motion, Road vehicle engineering, Passenger road vehicles, Dynamic testing, Road holding, Direction of movement
Publisher	BSI
Committee	AUE/15
ICS Codes	43.100 - Passenger cars. Caravans and light trailers

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BS ISO 4138:2021

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