A Study of Parameter Identification for a Thermal-Mechanical Tire Model based on Flat Track Measurements

摘要

Prevailing tire models show a certain lack of accuracy in some advanced handling applications. This lack of accuracy is partly due to thermal effects. In reality, the tire rubber temperature is not constant during these operating conditions and the tire's friction coefficient, the cornering/braking stiffness and the rubber properties depend on the temperature. In order to increase the accuracy of the tire model also in conditions with higher slip, Fraunhofer ITWM has developed the thermo-dynamical model CDTire/Thermal. This thermal model can be coupled with the enhanced magic formula CDTire/MF++ as well as the structural tire model CDTire/3D. Both tire models implement a temperature dependency (see [1]). The necessary measurements and the parameter identification procedure represent always a crucial point for any mathematical model. Through this paper the authors present a methodology to parameterize the CDTire/Thermal as well as the temperature dependency of CDTire/MF++ and CDTire/3D. One of the crucial points in this process are the design of experiments suitable for an MTS flat track test bench to feature the parameter identification of the physical parameters of the thermo-mechanical as well as the temperature depended parameters of the two mechanical models. In the over-all process the parametrization of CDTire/MF++ together with CDTire/Thermal is essential because the parameters of the thermo-mechanical model are one-to-one used to parametrize the temperate dependency of CDTire/3D.