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The aims of the research are to overview of the existing online tire-road friction estimation methods, available in the scientific literature, and investigate the possibilities of employing new methodologies to improve the estimation accuracy of this parameter. For this purpose a Matlab/Simulink vehicle dynamics based model was created to facilitate the study of different methods and is suitable also for new concept validation. Three methods were selected for deeper analysis, such as: Slip-Slope Method  which utilizes the relationship between normalized longitudinal tire force and slip ratio to determine the friction coefficient; Cornering Stiffness Method  which try to detect the maximum of the friction coefficient; Burckhardt Method  based on a special formula. All these methods was verified by simulations based on real measurement data recorded by a test car on a test track.
Date of Conference: 6-9 Sept. 2011