BS ISO 15222:2011
$142.49
Truck and bus tyres. Method for measuring relative wet grip performance. Loaded new tyres
| Published By | Publication Date | Number of Pages |
| BSI | 2011 | 28 |
This International Standard 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 this International Standard are meant to reduce the variability. The use of a reference tyre is necessary to limit the variability of the testing method procedures.
This International Standard applies to all truck and bus tyres (commercial vehicle tyres).
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 7 | 1 Scope 2 Normative references |
| 8 | 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 |
| 9 | 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 |
| 10 | 5.1.3 Standard Reference Test Tyre (SRTT) method 5.2 Wetting conditions 5.3 Atmospheric conditions 5.4 Reference tyres |
| 11 | 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 |
| 12 | 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 |
| 13 | 6.5.3 Tyre load 6.5.4 Tyre inflation pressure 6.6 Procedure |
| 14 | 6.7 Processing of measurement results 6.7.1 Calculation of the average deceleration, AD 6.7.2 Validation of results |
| 15 | 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 |
| 16 | 6.8 Wet grip performance comparison between a candidate tyre and a reference tyre using a control tyre 6.8.1 General |
| 17 | 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 |
| 18 | 7.2 Apparatus 7.3 Instrumentation 7.3.1 General 7.3.2 General requirements for measurement system 7.3.2.1 General |
| 19 | 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 |
| 20 | 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 |
| 21 | 7.8 Processing of measurement results 7.8.1 General |
| 22 | 7.8.2 Validation of results 7.8.3 Calculation of the relative wet grip index of the tyre |
