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Analysis of wheel speed vibrations for road friction classification

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Author: Schmeitz, A.J.C. · Alirezaei, M.
Type:article
Date:2016
Source:Vehicle System Dynamics, 1, 54
Identifier: 531281
doi: DOI:10.1080/00423114.2015.1131307
Keywords: Traffic · Tyre dynamics · Friction estimation · Tyre modelling · Vehicle modelling · Road classification · Mobility · Fluid & Solid Mechanics · IVS - Integrated Vehicle Safety · TS - Technical Sciences

Abstract

With higher level of vehicle automation, it becomes increasingly important to know the maximum possible tyre forces during normal driving. An interesting method in this respect is estimating the tyre-road friction from the resonance in the wheel speed signal, excited by road roughness. A simulation environment using the MFSwift tyre model is proposed, which gives insight in the correctness and functioning of this method. From implementing the estimation algorithm and considering the tyre torsional vibration system, it is concluded that frequencies and damping ratios can be estimated with reasonable accuracy and that the trends observed with changing road friction are consistent. Furthermore, the proposed simulation environment gives opportunity to investigate other issues like robustness of the estimation method to road roughness. Additionally, the tyre modelling aspect of the estimation method is analysed and improvements are proposed.