Monitoring tire-road friction using the wheel slip

Tire-road friction estimation has become an intense research area as the interest of information technology in vehicles increases. In this work, we follow a model-based approach where the difference in wheel velocities of driven and non-driven wheels is used. The perhaps most important feature is that only existing sensors are needed if the car is supplied with ABS brakes. The goal is to compute certain parameters from available standard sensors in the car, which depend directly or indirectly on the friction, and to find rules regarding how to evaluate the maximal friction forces that can be used for braking or cornering.