关键词: 滑转率, 路面附着, 模糊逻辑, 牵引力控制系统

Abstract: In split-μ road, it is easy to create active braking force on the high-μ side wheel in traction control system(TCS), which is due to the error of road adhesion state identification. It makes braking force and driving force consume each other and causes the vehicle shaking. Hence the accuracy and rapidity of tire-road adhesion state identification on complicated road is a key norm to evaluate the robustness of TCS, and a necessary factor to enhance the control effect of TCS. A comprehensive method for identification of road adhesion state is presented in this paper. A fuzzy logic, which adopts the absolute different value of road utilization adhesion coefficient and slip speed between the both sides of driving wheel as inputs, is used in this method. The confidence coefficient is introduced. Road adhesion state is estimated according to the interval in which the value of confidence coefficient locates. The simulation and test verify that the method for identification of road adhesion state is effective and timely.

Key words: Fuzzy logic, Road adhesion, Slip rate, Traction control system