Modeling And Simulation Analysis On Vehicle Forward Anti-collision Warning Control System

Heavy casualties and property damage caused by traffic accidents make the issueof road transportation safety have become an increasingly serious social issue. Theactive safety techniques based on intelligent transportation system can avoid trafficaccidents fundamentally. The vehicle active anti-collision warning system is a hotspotin the field of active safety research area at home and abroad. The closer study isimportant to reduce the accident rate and property losses, and to promote thedevelopment of intelligent transportation.Traffic safety distance algorithm is the basis of the anti-collision warning system.Considering the balance between traffic safety and efficiency of road transport, thispaper proposed the safety distance met driver operating characteristics by fittingfunction in MATLAB based on the data from statistical analysis of the drivingcharacteristics of drivers, then designed a multilevel warning model based on thesafety distance model. Aiming at the deficiencies of the existing intelligent cruisecontrol system, proposed the intelligent cruise control system applicable to wholespeed domain integrated stop and go cruise control mode. Designed the overall plan ofvehicle active anti-collision warning system, programmed different operation modesaccording to the functional requirements. Studied vehicle dynamics model, safetydistance algorithm and controller modeling based on vehicle dynamics and co ntroltheory. Control system adopted a hierarchical modular design, determinedcorresponding upper controller according to different control functions. The collisionavoidance upper controller take overtaking incorporated condition into account toavoid rear-end accidents caused by improper automatic control. Due to the strongnonlinear and rapid reaction performance of vehicle stop and go cruise control system,established the upper controller based on optimal control theory. Adaptive cruiseupper controller applied to high-speed situation adopt fuzzy control theory directly,the lower controller based on fuzzy PID control theory can achieve control parametersself-tuning real-time online, had better flexibility. Established vehicle longitudinaldynamics model with Carsim, the inverse engine model had designed bytwo-dimensional interpolation in MATLAB based on a series of simulationexperiments in Carsim, with high degree of accuracy, simplified algorithm. Inverse longitudinal dynamical model has built in Simulink, then the simulation loop formed.The simulation results shows that the vehicle active anti-collision warningsystem designed in this paper can achieve collision warning, intelligent cruise controlat high speed and stop and go cruise control at low speed, has important significant toreduce driver fatigue, improve vehicle active safety and reduce accident rates hasimportant significance.