Standards Development

Scope

This International Standard specifies a generic tyre model and model parameters for calculation of lateral tyre forces, to be used for lateral stability simulations of heavy commercial vehicle combinations with test cases according to ISO 14791. This tyre standard is typically aiming to be useful when comparing and ranking various vehicle combination configurations regarding on-road lateral and roll stability at close to constant speed levels typical for public roads, typically higher than 40 km/h. The tyre model can also be useful for slow speed manoeuvring.

This tyre model is parameterized by easily understood characteristics and can be used in case tyre performance data from measurements are not available or preferred. This tyre model is relevant for representing vehicle combination tyre performance, when the magnitude of longitudinal force is typically less than 10% of peak longitudinal friction utilization, and when the lateral friction utilization is less than 75%. The tyre model can be used for normal forces from zero to double the nominal normal force of the tyre.

This tyre model is suitable for vehicle models operating in the yaw and roll plane which naturally include vertical load transfer between wheels in manoeuvres. The tyre model can also be use in models with less complexity such as pure yaw plane models.

The standard applies to heavy vehicles, including commercial vehicles, commercial vehicle combinations, buses and articulated buses as defined in ISO 3833 (trucks and trailers with a maximum weight above 3.5 tonnes and buses and articulated buses with a maximum weight above 5 tonnes, according to ECE and EC vehicle classification, categories M3, N2, N3, O3 and O4).

Purpose

This tyre model is parameterized by physical tyre specifications and operational conditions, and can be used in case tyre performance data from measurements are not available or preferred