ISO 15222:2011
Truck and bus tyres — Method for measuring relative wet grip performance — Loaded new tyres
ISO 15222:2011 specifies the method for measuring relative wet grip braking performance index to a reference under loaded conditions for new tyres for use on commercial vehicles on a wet-paved surface.
The methods developed in ISO 15222:2011 are meant to reduce the variability. The use of a reference tyre is necessary to limit the variability of the testing method procedures.
ISO 15222:2011 applies to all truck and bus tyres (commercial vehicle tyres).
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1 Scope
2 Normative references
3 Terms and definitions
3.1 General terms and definitions
3.2 Terms and definitions for the vehicle testing method described in Clause 6
3.3 Terms and definitions for the trailer or tyre test vehicle testing method described in Clause 7
4 Methods for measuring wet grip
5 General test conditions
5.1 Track characteristics
5.1.1 General
5.1.2 British Pendulum Number (BPN) method
5.1.3 Standard Reference Test Tyre (SRTT) method
5.2 Wetting conditions
5.3 Atmospheric conditions
5.4 Reference tyres
6 Measurement of tyre wet grip on a standard vehicle
6.1 Principle
6.2 Equipment
6.2.1 Vehicle
6.2.2 Measuring equipment
6.3 Conditioning of the test track
6.4 Measurement requirements for test speeds
6.5 Tyres and rims
6.5.1 Vehicle equipment
6.5.2 Tyre preparation and break-in
6.5.3 Tyre load
6.5.4 Tyre inflation pressure
6.6 Procedure
6.7 Processing of measurement results
6.7.1 Calculation of the average deceleration, AD
6.7.2 Validation of results
6.7.3 Calculation of average AD
6.7.4 Calculation of braking force coefficient, BFC
6.7.5 Calculation of the relative wet grip index of the tyre
6.8 Wet grip performance comparison between a candidate tyre and a reference tyre using a control tyre
6.8.1 General
6.8.2 Principle of the approach
6.8.3 Selection of a set of tyres as a control tyre set
6.8.4 Storage and preservation of control tyres
6.8.5 Replacement of control tyres
7 Test method using a trailer or a tyre test vehicle
7.1 Principle
7.2 Apparatus
7.3 Instrumentation
7.3.1 General
7.3.2 General requirements for measurement system
7.3.2.1 General
7.3.2.2 Vehicle speed
7.3.2.3 Braking forces
7.3.2.4 Vertical load
7.3.2.5 Signal conditioning and recording system
7.4 Selection and preparation of test tyres
7.5 Preparation of the apparatus and the test track
7.5.1 Towed trailer
7.5.2 Tyre test vehicle
7.5.3 Instrumentation and equipment
7.5.4 Conditioning of the track
7.6 General test conditions
7.7 Procedure
7.8 Processing of measurement results
7.8.1 General
7.8.2 Validation of results
7.8.3 Calculation of the relative wet grip index of the tyre
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1 Scope
2 Normative references
3 Terms and definitions
3.1 General terms and definitions
3.2 Terms and definitions for the vehicle testing method described in Clause 6
3.3 Terms and definitions for the trailer or tyre test vehicle testing method described in Clause 7
4 Methods for measuring wet grip
5 General test conditions
5.1 Track characteristics
5.1.1 General
5.1.2 British Pendulum Number (BPN) method
5.1.3 Standard Reference Test Tyre (SRTT) method
5.2 Wetting conditions
5.3 Atmospheric conditions
5.4 Reference tyres
6 Measurement of tyre wet grip on a standard vehicle
6.1 Principle
6.2 Equipment
6.2.1 Vehicle
6.2.2 Measuring equipment
6.3 Conditioning of the test track
6.4 Measurement requirements for test speeds
6.5 Tyres and rims
6.5.1 Vehicle equipment
6.5.2 Tyre preparation and break-in
6.5.3 Tyre load
6.5.4 Tyre inflation pressure
6.6 Procedure
6.7 Processing of measurement results
6.7.1 Calculation of the average deceleration, AD
6.7.2 Validation of results
6.7.3 Calculation of average AD
6.7.4 Calculation of braking force coefficient, BFC
6.7.5 Calculation of the relative wet grip index of the tyre
6.8 Wet grip performance comparison between a candidate tyre and a reference tyre using a control tyre
6.8.1 General
6.8.2 Principle of the approach
6.8.3 Selection of a set of tyres as a control tyre set
6.8.4 Storage and preservation of control tyres
6.8.5 Replacement of control tyres
7 Test method using a trailer or a tyre test vehicle
7.1 Principle
7.2 Apparatus
7.3 Instrumentation
7.3.1 General
7.3.2 General requirements for measurement system
7.3.2.1 General
7.3.2.2 Vehicle speed
7.3.2.3 Braking forces
7.3.2.4 Vertical load
7.3.2.5 Signal conditioning and recording system
7.4 Selection and preparation of test tyres
7.5 Preparation of the apparatus and the test track
7.5.1 Towed trailer
7.5.2 Tyre test vehicle
7.5.3 Instrumentation and equipment
7.5.4 Conditioning of the track
7.6 General test conditions
7.7 Procedure
7.8 Processing of measurement results
7.8.1 General
7.8.2 Validation of results
7.8.3 Calculation of the relative wet grip index of the tyre