Research On Vehicle Forward Collision Avoidance Warning System

With continuous growing of car ownerships,the problem of traffic jam has become more and more serious,so car safety has become a thorny issue for the automotive industry.In recent years,the vehicle forward collision avoidance warning system has received more and more attention.It can not only reduce the occurrence of vehicle longitudinal collision,but also reduce the driver’s working intensity.It is of great significance to do research on the system for the development of China’s automobile safety.First of all,it discusses the related basic theory of vehicle forward collision avoidance warning system,and studies the general train of thought.The automobile safety status judgment module is built based on Matlab/Simulink software.Based on GB/T 33577-2017 standard safety distance model is designed.Through the design of the driver reaction time measurement system,after the driver’s test,driver reaction time is obtained,so that the calculated safety distance is more in line with the actual situation.Kalman filter is used to estimate the relative acceleration,and the simulation results show that the relative acceleration estimated by Kalman filter is more stable than the relative acceleration obtained by differentiation.The PanoSim software is then used to model the vehicle dynamics system.According to the principle of vehicle longitudinal dynamics,a reverse longitudinal dynamics system of vehicle is designed by using Matlab/Simulink software.This module obtains the desired throttle opening and brake pressure by entering the control acceleration.Through the control of the two parameters achieve the car’s longitudinal acceleration or deceleration.Then the controller of the vehicle forward collision avoidance warning system is designed.Based on the PID controller theory,the trial and error method is used to get the parameter values of the PID controller.And through PanoSim software and Matlab/Simulink software co-simulation to verify the performance of the vehicle forward collision avoidance warning system controller.The results show that the controller can quickly and accurately control the car to achieve cruise control and emergency braking.Finally,the function of the vehicle forward collision avoidance warning system is validated by building a virtual simulation platform.The results show that the vehicle forward collision avoidance warning system designed in this paper can meet the requirements of early warning function in GB/T 33577-2017 standard and the emergency braking function in C-NCAP(2018 version).