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.<\/p>\n
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.<\/p>\n
This International Standard applies to all truck and bus tyres (commercial vehicle tyres).<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 7<\/td>\n | 1 Scope 2 Normative references <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 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\u00a07 <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 5.1.3 Standard Reference Test Tyre (SRTT) method 5.2 Wetting conditions 5.3 Atmospheric conditions 5.4 Reference tyres <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 6.5.3 Tyre load 6.5.4 Tyre inflation pressure 6.6 Procedure <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 6.7 Processing of measurement results 6.7.1 Calculation of the average deceleration, AD 6.7.2 Validation of results <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | 6.8 Wet grip performance comparison between a candidate tyre and a reference tyre using a control tyre 6.8.1 General <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 7.2 Apparatus 7.3 Instrumentation 7.3.1 General 7.3.2 General requirements for measurement system 7.3.2.1 General <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 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 <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 7.8 Processing of measurement results 7.8.1 General <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 7.8.2 Validation of results 7.8.3 Calculation of the relative wet grip index of the tyre <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Truck and bus tyres. Method for measuring relative wet grip performance. Loaded new tyres<\/b><\/p>\n |