The Research On Warning Level Of Lane Change Aid System Based On Millimeter-Wave Radar

With the increasing of the automobile amount and drivers amount,traffic safety is getting more and more attention from consumers and OEMs,What's researchers take vehicle active safety technology as the focus of improving vehicle safety,The configuration rate of the vehicle lane change warning system of the variable path security service is also significantly improved,and it is possible to monitor the traffic condition at the rear of the vehicle in real time and to change the condition for the driver to judge whether there is a safe condition in advance or not effectively avoids accidents.Through the study of the current vehicle lane change warning system,it is found that most of the vehicle lane change warning system is only a single alarm based on the degree of threat of the target vehicle to its own vehicle,and does not take the human-car-road closed-loop system into account.This alarm reduces the driver's driving comfort and the driver's trust in the system.Therefore,it is of great practical significance to take in-depth study set up a reasonable classification for the alarm of the vehicle lane change warning system.This paper puts forward the two-level division of the alarm of the vehicle lane change warning system from the view of ergonomics,and uses the millimeter-wave radar as the sensor of the system to obtain the environmental information around the vehicle: The hidden Markov model is used to identify the driver 's lane change intention;Using the concept of human-computer interaction to determine the alarm mode,The alarm threshold parameters are determined by the variable path collision model,and the alarm situation is analyzed deeply;Finally,the performance is verified and the reasonable evaluation is got through the method of real vehicle test.The main work of this paper is as follows:(1)Analyze the dangerous areas that need to be concerned about the vehicle lane change warning system,divide the dangerous situation into the blind area's vehicles and the fast approaching vehicles.According to the practical needs of the system,select the millimeter-wave radar as the sensor of the system;the location of the sensor was studied to determine the use of two radars and were installed in the left rear and rear of the vehicle,providing a hardware basis for the overall system.(2)Designing lane change acquisition test,collecting the natural conditions data,selecting the appropriate characterization parameters,training hidden Markov model,identifying the driver's lane.(3)From the ergonomic thinking,the paper studies the form of alarm of vehicle lane change warning,and selects the form of visual and auditory as the alarm form.Defining the alarm area of the vehicle change warning system,and analyses lane change collision model,The alarm threshold parameters are determined as the distance and TTC(Time To Collision)with Improved algorithm.The alarm level of the system is divided into two levels according to the driver's intention,the first level is based on the alarm to remind the meaning,the second level is based on the alarm to warn the meaning,and then the typical alarm situation has been analyzed.(4)verifying the performance and rationality of the system by the way of the vehicle test through driver driving,and analyze the alarm situation in the process of running the vehicle to determine the warning accuracy rate of the system.The rationality of the system alarm level classification was evaluated by means of the drivers' questionnaire.