Simulation And Optimization Of Automotive AEB Control

With the continuous development of society and the increasing prosperity of people's life,automobiles have entered thousands of households.However,while changing people's way of travel and transportation,automobiles also bring serious traffic and environmental problems.To reduce the incidence of traffic accidents and reduce the loss caused by car collision accidents has become the focus of attention.Automobile manufacturers are also racking their brains for this,from the beginning of passive safety facilities(seat belts,airbags)to today's automatic emergency braking system,vehicle adaptive cruise system,etc.,are considered all for people's travel safety.The automatic emergency braking system in the vehicle active safety configuration can help the driver to brake the vehicle in dangerous situations,and can effectively avoid the occurrence of collision accidents or reduce the loss caused by collision accidents.This paper researchs the vehicle automatic emergency braking system,mainly studies the control strategy of automatic emergency braking,hoping to improve and optimize the existing automatic emergency braking strategy,so that it can be better provide security for people's driving and riding safety.After studying the existing safety distance model of automatic emergency braking strategy,It is found that the existing safety distance model based on collision time collides with the vehicle ahead at the speed of 33 km / h and 16 km / h respectively in CCRs and CCRb tests of Euro NACP regulations.Under the above test conditions,the obstacle avoidance function of the vehicle can not be realized,only the vehicle speed can be reduced to reduce the loss caused by the collision.Since the existing safety distance simulation based on collision time only considers the relative speed and distance of the main vehicle and the target vehicle,and does not consider the changes of other parameters in the process of vehicle driving.Therefore,this paper is based on the actual movement of vehicles and the theory of motion,and considers the relationship between relative acceleration,relative speed and relative distance when calculating vehicle collision time according to the kinematic formula,the improved safety distance model based on collision time is established.Considering the serious consequences of high-intensity braking in the process of high-speed movement and the extreme discomfort of drivers and passengers,this paper uses the strategy of graded braking for vehicle automatic emergency braking strategy.In order to verify the improved safety distance model based on collision time,this paper uses Car Sim software to model the vehicle dynamics,builds a virtual simulation environment in the software Prescan in the vehicle borne radar system,and finally verifies the improved safety distance model based on collision time based on Euro-NACP regulations.The results show that the improved safety distance model based on collision time can make up for the shortcomings of the existing safety distance model based on collision time,and effectively avoid the occurrence of collision accidents.