Computer Simulation Study Of VDSC

Automobile safety technology includes active and passive safety technology. Generally speaking, passive safety aims at the protection of drivers and crew member after automobiles are collided. Active safety is used to prevent traffic accident happening when automobiles are being driven at high speed. In recent years, with the development of economy and automobile technology, highway traffics show tendency of driving at high speed, driving without occupation, crowing in road. So it is urgent need to change traditional passive safety into active safety preventing traffic safety happening. Active safety includes brake safety, starting safety, turning safety and driving safety. The study work in this paper is developed on the base of the driving safety.While cars are driven during turning on the road with low adhesion coefficient or at high speed, the lateral force of the tyre usually attained to the physical limit and the vehicle dynamics stability will be lost because of the exoteric disturbance or cornering so the traffic accidents frequently happen. The handling and the stability can be improved in the limit conditions by using the VDSC. According to the current research state of the VDSC methods, the fuzzy control theory is applied in the research of the VDSC, the contribution of which to vehicle performance is analyzed.The soft ADAMS/CAR is applied to create 22 freedoms dynamics model of vehicle, which is verified and simulated to provide a correct vehicle model for the study of VDSC. The SIMULINK is applied to create two freedoms ideal vehicle model which is used to compute the yaw velocity and the vehicle slip angle in different steering angles and vehicle velocities. Based on the contribution of the single wheel braking to yaw moment which is conditional value of fuzzy controller, according to the basic theory of the VDSC. The control strategies by using single wheel braking can improve Vehicle dynamics stability are brought forward. Then due to nonlinear and time-varying property of the VDSC system, the fuzzy controller with robustness is selected. The input of controller is difference and changing rate of difference between the actual yaw and the ideal yaw, the output is the yaw moment that plays stability restoration role. Based on SIMULINK platform, the mechanical model and controller are combined to compute operating model of a single lane and the step angle. The results show that the vehicle performance with VDSC is better than without VDSC, concretely speaking, the tracing performance becomes better, the potential of running litter radius of turn is improved. Generally speaking VDSC improve the performance of handing and stability and active safety.