Development of identification of tire-road friction conditions

The real-time knowledge of tire-road friction conditions is indispensable for many vehicle control systems, particularly active safety control systems such as adaptive cruise control (ACC), anti-lock braking systems (ABS), electronic stability program (ESP), and acceleration slip regulation (ASR). However, the tire-road friction coefficient is not measured directly. Therefore, several different identification approaches are proposed to obtain the information on the tire-road friction coefficient indirectly. This paper introduces tire force system and the developing status on identification of tire-road friction conditions involving the approach based on sensor equipment and the approach utilize the measurement of the vehicle motion, and some classical identification algorithms used in this field. At last, the existing problems and the future development direction of identification of tire-road friction conditions are pointed out and discussed.