ISO 7975:2019

Passenger cars — Braking in a turn — Open-loop test method

This document specifies an open-loop test procedure to examine the effect of braking on course holding and directional behaviour of a vehicle. Specifically, the method determines how the steady-state circular response of a vehicle is altered by a braking action only. This document is applicable to passenger cars as defined in ISO 3833 and to light trucks. The open-loop manoeuvre specified in this test method is not representative of real driving conditions but is useful to obtain measures of vehicle braking behaviour resulting from control inputs under closely controlled test conditions.

Voitures particulières — Freinage en virage — Méthode d'essai en boucle ouverte

General Information

• Status: Published
• Publication Date: 15-Apr-2019
• ICS: 43.100 - Passenger cars. Caravans and light trailers
• Technical Committee: ISO/TC 22/SC 33 - Vehicle dynamics and chassis components
• Drafting Committee: ISO/TC 22/SC 33/WG 2 - Vehicle dynamics of passenger cars
• Current Stage: 9020 - International Standard under periodical review
• Start Date: 15-Apr-2024
• Completion Date: 15-Apr-2024

Relations

• Revises: ISO 7975:2006 - Passenger cars — Braking in a turn — Open-loop test method
• Effective Date: 04-Nov-2015

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 7975
Fourth edition
2019-04
Passenger cars — Braking in a turn —
Open-loop test method
Voitures particulières — Freinage en virage — Méthode d'essai en
boucle ouverte
Reference number
ISO 7975:2019(E)
©
ISO 2019

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ISO 7975:2019(E)

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© ISO 2019
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ii © ISO 2019 – All rights reserved

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ISO 7975:2019(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Variables . 2
5.1 Reference system . 2
5.2 Variables to be measured . 2
6 Measuring equipment . 2
6.1 Description . 2
6.2 Transducers and their installation . 3
6.3 Data processing . 3
7 Test conditions . 3
8 Test methods . 3
8.1 Run-in program for newly installed brakes (pads/shoes) . 3
8.2 Warm-up. 3
8.3 Brake temperature . 4
8.4 Initial driving condition .
...