Research On Active And Passive Safety Under Intersection Turning Conditions

The increase in car ownership in my country has led to frequent traffic accidents.The traffic accidents between vehicles and vehicles in the cross-intersection scene are particularly prominent.In order to reduce traffic accidents,the passive technology of car owners has developed rapidly.The planning control system is equipped with a visual sensor to adopt a warning or braking strategy before collision to reduce the damage caused by collision or prevent traffic accidents.Automotive passive safety technology can target the response analysis of vehicles and occupants when the vehicle collides and optimize the occupation of the occupant damage.Essence At present,the combination of passive safety research under the intersection of the crossroads is relatively lacking.Therefore,this article carried out the main passive safety research under the crossroads of the crossroads.First of all,the intersection scenario was built and divided into zones,and the corresponding trajectory planning was carried out according to the straight line area outside the intersection and the turning area inside the intersection,and the discrete LQR-double PID transverse-longitudinal decoupling controller was designed to consider the understeer and tracking error of the car;the joint simulation platform of Carsim,Simulink and Prescan was built to verify the single-vehicle.The results show that the planning controller designed in this paper performs well under different driving conditions in the intersection scenario;when the main vehicle takes active braking measures and the obstacle vehicle pass through the intersection at the same time under the intersection turning conditions,the main vehicle and the obstacle vehicle have an oblique angle collision in the intersection,and the vehicle response in the pre-collision phase is obtained.Secondly,a finite element vehicle model and a driver restraint system model were built with the 2010 Yaris vehicle model as the research object,and the validity of the above two models was verified by comparing with the official data.Then,the vehicle response in the pre-crash stage was input into the crash model as boundary conditions to obtain the vehicle motion data in six degrees of freedom according to the left-turn simulation test conditions in the intersection,and the motion data was input into the occupant restraint system as boundary conditions for simulation analysis,and the results showed that the 3ms synthetic acceleration of the head and chest of the dummy was 34.6g and 28.2g,and the occupant suffered a large damage value.Finally,the influence of active seat belt intervention on occupant injury was analyzed and some parameters of the restraint system were matched and optimized.The results show that the intervention of active seat belt can reduce the injury of occupants in the collision process to a certain extent,but the value of occupant injury is still large,and then the WIC value is used as the optimization target,40 groups of samples are selected to establish the Kriging model using MOGA-II algorithm to optimize the model.The optimization results showed that the optimized occupant injury values improved,including a 10% decrease in neck injury value,a 14.5%decrease in head injury value,and a 5.9% decrease in WIC after optimization...