Abstract: From the point of view of rapid response to driver’s intention in driver-vehicle-road closed loop system, the rate of steering wheel angle is introduced into vehicle dynamics model of two degree of freedom which is most used to comprehensively represent the intensity of driver steer maneuver and is adopted as the reference model by almost all electronic stability program(ESP). Meanwhile, considering the vehicle current state and previous states of the tendency of understeering or oversteering, an improved ESP is established and consists of 32 control states totally including sixteen control states in which one single road wheel is braked and the other sixteen control states in which multi-wheel is braked actively. Finally the field experiments of ESP in summer and winter have been implemented and the results show that the new ESP algorithm can obviously improve response performance for the change of driver maneuver and enhance vehicle stability performance effectively.

Key words: electronic stability control;control states and switch conditions;driver’s intention;multi-wheel active brake