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Knowledge of tire friction force capacity, i.e. tire-load frictional coefficient, is important for the control of vehicle active safety systems. In this paper we review several methods for friction estimation and develop two robust and cost effective methods based on a nonlinear least square approach and the peak aligning torque. The methods proposed in this paper utilize simple vehicle lateral dynamics, steering system, and front tire dynamics. The first estimator uses direct calculation baseddoi:10.1109/acc.2009.5159952 dblp:conf/amcc/AhnPT09 fatcat:q6apeiubvfhf3h6gc4bohvbcbe