The Modeling And Simulation Of Automodbile Active Anti-collision System In Longitudinal

Nowadays, the speed of the car continuously improved,the traffic pressure become more and more seriously,it bring the increasingly serious traffic safety problems. In order to alleviate the problem,on one hand many countries government have issued a large amount of traffic safety regulations to regulate the safe driving behavior; on the other hand, the major automotive canpenies were asked to invested a large amount of research for automotive safety technology,and developing effective car safety system. Among them, automodbile active anti-collision systems are become the enterprises in the research of active safety. It is a preventive technical equipment, Can greatly reduce the incidence of traffic accidents and the labor intensity of the driver’s, it has Practical value and broad market prospects.This paper summarizes the domestic and foreign relevant research, based on the characteristics of the automodbile active anti-collision system.it designed the function of the system, general structure and control target scheme, and to realize the design scheme of the key technology for a detailed analysis shows.it provides the way for the actual development of the system.This paper based on vehicle dynamics, use ADAMS dynamics simulation software build the vehicle dynamics model, Use the Matlab/Simulink control simulation software build the throttle brake switch model, inverse brake model and inverse engine model, with both joint, realizing closed-loop control simulation system.Do requirement analysis for the anti-collision system safety distance model, establish the safety distance model to meet three requirements. For vehicle braking process of detailed derivation and instructions, it is concluded that general alarm distance model and critical safety distance model, and to the warning algorithm for certain research.Make three planning for the automodbile active anti-collision system’s Control function, based on the control function planning, design the adaptive cruise respectively mode and the city with vehicle model. For adaptive cruise model, set up the upper adaptive cruise fuzzy controller; For the city with the vehicle model, based on the critical safety distance build the upper model controller. For the characteristics of the two control mode, separately earried on the typical operating conditions simulation, in order to verify the accuracy of the control algorithm. The simulation results show that the design of the two control algorithm can satisfy all active anti-collision system’s request, provide a reference for follow-up study.