ABSTRACT
As the cornering stiffness of tire decreases on a wet surface, the performances of course tracking and course holding become worse. To compensate the deterioration of the vehicle dynamics, drivers tend to operate the steering wheel in a certain sense of adaptation. In this paper, a new adaptive control model of a human driver is presented using the theory of model reference adaptive control system (MRAC). The word “adaptive” in this paper means that the steering gain of a driver is not constant but changeable, corresponding to the change of vehicle parameters. With this adaptive control model, the computer simulation of the closed-loop system is carried out when the driver is going to modify his steering maneuver on wet surface.
