Research On High-speed Overtaking Safety Early Warning Considering The Key Response Characteristics Of Vehicle Dynamics

As a highly efficient road driving behavior,overtaking is not uncommon in the daily driving of drivers.And because of the substantial increase in the number of motor vehicles in recent years,the research on road safety driving behavior has been increasing.The overtaking behavior studied in this article As a direction in this field.When an ordinary car is driving on a highway,it encounters a state where the vehicle in front hinders it from driving at a certain speed,so it needs to overtake the vehicle in front.In this process,due to the characteristics of fast speed and light weight,and the road surface Roughness will cause the vehicle to vibrate,and these uncertain conditions will continue to increase the probability of a vehicle being dangerous during overtaking.Therefore,by studying the dynamic response characteristics reflected by the vehicle during this process and determining the range of the vehicle's dangerous situation,not only can it effectively improve the ride comfort and safety of the vehicle during overtaking,but also prevent traffic accidents on the highway The probability of occurrence of the accident,improve road passing capacity and efficiency.Firstly,in order to establish a vehicle-road coupling dynamics model,the overtaking trajectory is analyzed and parameterized,combined with the road surface roughness power spectrum density function to establish a road model;after the mechanical analysis of the vehicle's half of the four degrees of freedom model Build a vehicle model.Secondly,through the analysis of the impact of the vehicle's roll performance when overtaking,the vehicle-road coupling dynamics model is established in ADAMS/CAR,and the dynamics of the vehicle under different trajectories and driving speeds are obtained through multiple simulation experiments.Response characteristics.Then analyze and study the key feature indicators obtained from the experiment,and use MATLAB function to fit the polynomial function warning range of the tire lateral force Fy and the body roll angle ? during overtaking.Finally,through the orthogonal test method,the experimental results are analyzed to obtain the optimal driving speed and the safety distance required for changing lanes during overtaking,and the three-dimensional surface image of overtaking warning is drawn.The overtaking warning function obtained in this paper can effectively provide early warning for the safety of intelligent vehicle overtaking,and combined with ADAMS/CAR software to carry out virtual simulation experiments on the test vehicle,which meets the real test conditions and solves the dangerous problems of the real test.The early warning function model has a wide range of practicability,so it can continuously reduce the probability of traffic accidents caused by vehicle overtaking,and it will also provide important indicators and theoretical support for the future research of automotive active safety systems and intelligent vehicle overtaking safety early warning.