Study Of Vehicle Stability Closed-Loop Control System

Vehicle Stability Control (VSC) is an active safety device, which lets the vehicle run following the driver's intention to prevent vehicle from losing stability. Now, VSC is the international research focus in the vehicle active safety field. With development of control techniques and decrease of control system cost, VSC will replace ABS to be the standard device of modern vehicles. In recent years, Vehicle Stability Control gets great development abroad, and is gradually equipped to the moderate and top class cars; while in China, the research in this field is at very beginning. So, to study VSC has great significance for our country and also has broad application prospect.Based on the co-simulation method with ADAMS/Car and MATLAB/Simulink, the paper analyses the handling stability of the whole vehicle, which is respectively controlled by fuzzy control method. Virtual prototype models furnished with fuzzy control method are established under the environment of ADAMS/Car. The models implement the whole vehicle stability control through controlling the brake torque of the four wheels. In addition, the controller models of the whole vehicle are set up using MATLAB/Simulink software and simulations are done.The results show that the handling stability of fuzzy controlled full vehicle is better than that of the uncontrolled vehicle. The co-simulation method, where no complex dynamic equation and transfer function is needed, offers a new approach to control and simulate the complicated mechanism. At the same time, compared with the conventional means of design, it is much useful to assist designing, adjusting and testing via Virtual Prototype Technology. This means can highly enhance the efficiency of design, decrease the developing periods, cut down the cost of developing products and acquire the optimized integrated performance of the system.