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ISO 4138:2021

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

Sep 20, 2021

General information

90.20     Jul 15, 2026

ISO

ISO/TC 22/SC 33

International Standard

43.100  

English  

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Scope

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.
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.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 4138:2012

NOW

PUBLISHED
ISO 4138:2021
90.20 Standard under periodical review
Jul 15, 2026

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