ISO 4138:2021 PDF

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.

ISO 4138:2021 Referenced Document

ISO 15037-1:2019 Road vehicles — Vehicle dynamics test methods — Part 1: General conditions for passenger cars
ISO 8855 Road vehicles - Vehicle dynamics and road-holding ability - Vocabulary

2021 ISO 4138:2021 Passenger cars — Steady-state circular driving behaviour — Open-loop test methods
2012 ISO 4138:2012 Passenger cars - Steady-state circular driving behaviour - Open-loop test methods
2004 ISO 4138:2004 Passenger cars - Steady-state circular driving behaviour - Open-loop test methods
1996 ISO 4138:1996 Passenger cars - Steady-state circular driving behaviour - Open-loop test procedure
1982 ISO 4138:1982 Road vehicles; Steady state circular test procedure