ISO 21994:2022
Passenger cars — Stopping distance at straight-line braking with ABS — Open-loop test method
This document specifies an open-loop test method to determine the stopping distance of a vehicle during a straight-line braking manoeuvre, with the anti-lock braking system (ABS) fully engaged. This document applies to passenger cars as defined in ISO 3833 and light trucks.
This document specifies a reference method and is especially designed to ensure high repeatability.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Variables
5.1 Reference system
5.2 Variables to be measured
6 Measuring equipment
6.1 Description
6.2 Transducer installation
6.3 Calibration
6.4 Data processing
7 Test conditions
7.1 General test conditions
7.2 General data
7.3 Test track
7.4 Environmental conditions
7.5 Test vehicle
7.5.1 General vehicle condition
7.5.2 Tyres
7.5.3 Braking system
7.5.4 Loading conditions of the vehicle
8 Test procedure
8.1 Test preparation
8.1.1 Defining the measurement distance
8.1.2 Conditioning tyres and brake system
8.2 Measurements
8.2.1 Brake disc temperature
8.2.2 Initial driving condition
8.2.3 Brake pedal actuation
8.2.4 Conditions during braking
8.2.5 Number of measurements
9 Data evaluation and presentation of results
9.1 General
9.2 Nomenclature of distances and decelerations
9.3 Determination of normalized stopping distance sA100,norm
9.3.1 Determination of mean deceleration of a single test run
9.3.2 Determination of the normalized stopping distance of a single test run
9.3.3 Determination of mean deceleration and mean normalized stopping distance
9.4 Determining of ABS-braking distance sL90,norm(100) (optional)
9.5 Determination of normalized build-up distance sF10,norm (optional)
Annex A (informative) Test report − General data
Annex B (informative) Test report − Test conditions and results
Annex C (informative) Test sequence, specific terms and background information
Annex D (normative) Method for determination of FABS
Annex E (normative) Requirements for measurements and measuring equipment
Annex F (normative) Structure of the stopping distance calculation
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Variables
5.1 Reference system
5.2 Variables to be measured
6 Measuring equipment
6.1 Description
6.2 Transducer installation
6.3 Calibration
6.4 Data processing
7 Test conditions
7.1 General test conditions
7.2 General data
7.3 Test track
7.4 Environmental conditions
7.5 Test vehicle
7.5.1 General vehicle condition
7.5.2 Tyres
7.5.3 Braking system
7.5.4 Loading conditions of the vehicle
8 Test procedure
8.1 Test preparation
8.1.1 Defining the measurement distance
8.1.2 Conditioning tyres and brake system
8.2 Measurements
8.2.1 Brake disc temperature
8.2.2 Initial driving condition
8.2.3 Brake pedal actuation
8.2.4 Conditions during braking
8.2.5 Number of measurements
9 Data evaluation and presentation of results
9.1 General
9.2 Nomenclature of distances and decelerations
9.3 Determination of normalized stopping distance sA100,norm
9.3.1 Determination of mean deceleration of a single test run
9.3.2 Determination of the normalized stopping distance of a single test run
9.3.3 Determination of mean deceleration and mean normalized stopping distance
9.4 Determining of ABS-braking distance sL90,norm(100) (optional)
9.5 Determination of normalized build-up distance sF10,norm (optional)
Annex A (informative) Test report − General data
Annex B (informative) Test report − Test conditions and results
Annex C (informative) Test sequence, specific terms and background information
Annex D (normative) Method for determination of FABS
Annex E (normative) Requirements for measurements and measuring equipment
Annex F (normative) Structure of the stopping distance calculation
Bibliography