The brush model relies on the assumption that the slip is caused by deformation of the rubber material between the tire carcass and the ground. The material is approximated as small brush elements attached to the carcass, which is assumed to be stiff. The carcass can still flex toward the hub, but it can neither stretch nor shrink. Every brush element can deform independently of the other. A method is presented to make the description of the force-slip curve generated by the brush tire model more flexible. A calibration factor is applied to make the slope more or less convex. The main use is in car applications where road friction estimation is a major issue. If the real tire characteristic differs from the model there will be a bias in the estimation and a higher brake force is needed before a reliable friction coefficient can be estimated. Introduction of calibration parameters is a way to enhance the estimation, specially at lower brake forces. There exist several empirical models that describe the input/output formulas for a tire. The most well-known is the Magic Formula, presented by Pacejka and is used as reference curve in this investigation. The main result is that the modified brush tire model can be simpler, more flexible, and get a better agreement to the Magic Formula. Further, this new model is better suited for on-line parameter estimation.
Brush tire model with increased flexibility
Reifenreibungsmodell mit erhöhter Flexibilität
2003
6 Seiten, 9 Bilder, 6 Quellen
Conference paper
Storage medium
English
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