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BS ISO 7975:2019

$142.49

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

Published By Publication Date Number of Pages
BSI 2019 30
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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.

PDF Catalog

PDF Pages PDF Title
2 undefined
6 Foreword
7 Introduction
8 1 Scope
2 Normative references
3 Terms and definitions
4 Principle
9 5 Variables
5.1 Reference system
5.2 Variables to be measured
6 Measuring equipment
6.1 Description
10 6.2 Transducers and their installation
6.3 Data processing
7 Test conditions
8 Test methods
8.1 Run-in program for newly installed brakes (pads/shoes)
8.2 Warm-up
11 8.3 Brake temperature
8.4 Initial driving condition
8.5 Performance of the braking procedure
12 8.6 General test description
9 Data evaluation and presentation of results
9.1 General
9.2 Time histories
9.3 Braking action
9.3.1 Reference point in time, t0
13 9.3.2 Definition of times and requirements for standard evaluation
9.3.3 Mean longitudinal acceleration, 
14 9.3.4 Mean longitudinal acceleration, , until time tn
9.4 Evaluation of characteristic values
18 Annex A (normative) Presentation of results
29 Bibliography
BS ISO 7975:2019
$142.49