| With the improvement of people’s living standard,automobile is the first choice for more and more people because of its advantages of convenient and fast use.But with the increasing number of cars,the level of drivers is uneven and some bad driving habits,the result is more and more traffic accidents,especially rear-end collision accidents.Although the popularity of cars greatly facilitates our life,it is also a double-edged sword.Poor use will also bring huge loss of life and property to our life.For this reason,active safety technology has become the core development technology of automobile more and more.When evaluating the quality of a car,we pay more and more attention to its power performance,operation stability,energy saving and fuel saving,etc.In the study of automobile active safety technology,it is found that only early awareness of danger and correct driving operation is the core to avoid traffic accidents.Therefore,this is why the advanced driving auxiliary system(ADAS,Advanced Driver Assistant System)has been paid more and more attention by more and more automobile enterprises and scientific research institutions,and the automatic emergency braking technology(AEB,Autonomous Emergency Braking),which is the most basic and important component of the ADAS,has attracted more attention.Automatic emergency braking technology refers to the calculation of the control algorithm of the control system when the acquisition system of the vehicle detects a sudden change in the moving state of the vehicle in front and poses a danger to the vehicle.The corresponding control strategy is obtained and the corresponding execution signal is sent to the actuator to avoid traffic accidents or minimize collision hazards.For the purpose of developing the automatic emergency braking system which can adapt to the complex road environment,but also avoid the shortcomings of long period,high cost and poor safety in the real vehicle test,this paper will select the simulation control research of the automatic emergency braking system on the ADAS experimental platform.ADAS experimental platform is mainly composed of driving simulator,RT system,main control PC and ADAS controller.The RT system contains NI-RT and Car Sim RT,The driving and braking signals on the driving simulator are collected by collecting cards,After MATLAB/Simulink editing the safe distance model according to the sensor characteristics,And then the signal is transmitted to Car Sim,dynamics simulation software Dynamic simulation is carried out on the parameter setting of dynamic simulation software;By the RT system,the motion state and distance between the two vehicles collected by the virtual radar are transmitted to the rapid prototype controller,The rapid prototype controller can calculate the collected signal through the control algorithm in real time to obtain the corresponding control strategy,Then the corresponding instructions are passed to the executing agency of the system.Finally,the joint simulation of MATLAB/Simulink-NI-Veristand-Car Sim is realized.The function of automatic emergency braking technology is verified by hardware in the loop simulation on ADAS experimental platform.According to the response curve obtained from simulation and 3D animation demonstration,we can clearly see whether the system function is realized or not,and the advantage of ADAS experimental platform compared with real vehicle test is that ADAS experimental platform can test some dangerous conditions and limit conditions,which makes up for the lack of real vehicle test in this aspect,The hardware in the loop simulation results of ADAS experimental platform have the same value as the real vehicle test to a certain extent. |
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