Research On Stability Control Strategy Of Vehicle Collision Avoidance System

Safety is the eternal theme of the development of automobile,which has been a hot issue of research in recent years.Due to the increasing incidence of road traffic accidents in recent years,the automobile active safety system has attracted more and more attention.As an important part of advanced safety technology,active collision avoidance system has been studied deeply at home and abroad.However,many problems have not been solved so far.Active avoidance system can improve the road traffic safety,reduce traffic accident rate,promote the development of intelligent transportation system,so it has an important theoretical and practical significance to continue to carry out related research on active avoidance system.This paper presents a new type of vertical and horizontal collision avoidance system,which enriches and expands the function of active collision avoidance system.First of all,the establishment of the three degrees of freedom vehicle kinematics model,driver model,active front steering system,ABS anti lock braking system dynamics model and vehicle model for electromechanical coupling system,including dynamic simulation research for nonlinear model and linear robust controller design for uncertain model,and study the vehicle trajectory planning method for various road conditions;secondly,studied the stability control strategy in the process of automobile collision avoidance based on active steering system,and considering the model uncertainties,external disturbances and sensor noise and other factors,proposed active collision avoidance system stability control strategy;finally,established a new safety distance model of vertical and horizontal collision avoidance system,and then proposed a steering and braking coordination optimization method based on the safety distance model,active steering model and ABS antilock braking system.Then design the optimal allocation algorithm of steering and braking,and finally design slip rate control strategy based on fuzzy control theory in emergency condition.Simulation results show that the proposed vertical and horizontal collision avoidance system can effectively improve vehicle active safety and handling stability,the research content of this paper can provide theoretical support for the research of automobile active safety system.