ISO152222011-Overview.PDFVIP

Images à recevoir ISO 15222:2011- Overview Presented by Georges DIMITRI (ISO TC31/SC4-WG9 Chairman) for ISO/TC31 – Tyres, Rims and Valves Geneva, 12 September 2011 ADR – 2011-08 ISO15222 – 2 ISO 15222 : Truck and bus tyres Method for measuring relative wet grip performance - Loaded new tyres PROGRESSION
New Project Approved mid-2007
Committee Draft Approved Quarter 3/2009
DIS Ballot Approved Unanimously September 2010
Publication: Expected End of August 2011 ADR – 2011-08 ISO15222 – 3 ISO 15222 : Truck and bus tyres -- Method for measuring relative wet grip performance -- Loaded new tyres
SCOPE
Specifies the method for measuring relative wet grip braking performance index to a “reference tyre” under loaded conditions for new tyres.
Applies to all truck and bus tyres (C2 C3 tyre categories) on a defined wet-paved surface and conditions.
Method designed to reduce variability – Use of a reference tyre is necessary to limit variability of testing method procedures ADR – 2011-08 ISO15222 – 4 ? Relative performance test procedure  A candidate tyre is compared to a reference tyre using either a:
standard vehicle
or an analytical vehicle (trailer) ? Reference Tyre sizes  3 specified ASTM reference tyre sizes: ? 315/70R22.5  LARGE C3 tyre category ? 245/70R19.5  NARROW C3 tyre category ? 225/75 R16 C  ALL C2 tyre category  Principle of the Test Method ISO 15 222 METHOD WET GRIP Truck Buses ADR – 2011-08 ISO15222 – 5 Reference tyres  3 ASTM produced by Michelin SRTT for C3 tyres  2 Families C3 NARROW FAMILY S Nominal 285 mm C3 WIDE FAMILY S Nominal 285 mm ASTM F 2871 SRTT 245/70R19.5 ASTM F 2870 SRTT 315/70R22.5 SRTT for C2 tyres  (Rim Codes 17 ) ASTM F 2872 SRTT 225/75 R 16 C S Nominal = Tyre Nominal Section width ADR – 2011-08 ?The test is performed under loaded conditions on wet asphalt. ?Two options can be used Similar to ISO23671(C1 category tyres) : ? Truck Vehicle test The Average Deceleration (AD) is measu