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Robust Estimation of Road Frictional Coefficient

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3 Author(s)
Changsun Ahn ; Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI, USA ; Huei Peng ; Hongtei Eric Tseng

Knowledge of tire force potential, i.e., tire-road frictional coefficient, is important for vehicle active safety systems because tire-road friction is an effective measure of the safety margin of vehicle dynamics. For vehicle handling dynamics, the frictional coefficient is highly coupled with tire slip angle, therefore, they need to be estimated simultaneously when the latter is not measured. This paper presents an estimation algorithm based on a robust adaptive observer methodology. Stability and robustness of this observer are analyzed numerically. The performance is analyzed using computer simulations and experiments under various road and steering conditions.

Published in:

IEEE Transactions on Control Systems Technology  (Volume:21 ,  Issue: 1 )