Research On Automatic Emergency Braking System For Passenger Car

In the past ten years,with the rapid development of China's automotive technology,and the improvement of the national economy and living standards,basic every family can own a car,but with the increase in vehicle ownership,the number of car accidents is also increasing year by year,with the country in recent years in the automotive technology to promote the transformation to intelligent and electrification,Automotive companies are increasingly focusing on smart assisted driving and smart driving technologies.Among them,automatic emergency braking technology,is an effective reduction of accident rate,reduce personnel and property damage,one of the effective intelligent assisted driving technology,so at present,the major domestic host factories are very much the attention,which is also to improve China's active vehicle safety technology has an important significance.Automatic emergency braking system can be said to be the traditional vehicle stability system and brake anti-lock system and other active safety technology extension,therefore,with the relevant technology of enterprises,in the development of automatic emergency braking system has a certain advantage.From the automatic emergency braking system system composition and principle situ to analyze,mainly includes environmental awareness,information??,target screening,decision-making and vehicle control technology.Environmental awareness in the current industry mainly uses monocital???s and 24Hz and 77Hz millimeter wave??to detect the surrounding environment,such as surrounding road information,vehicle information,pedestrian information,information,information??due to the complexity of intelligent assisted driving and intelligent driving environment,the use of the above-mentioned various sense ways,Therefore,how to combine the information detected by these different sensors is one of the current technical challenges.In terms of target screening,according to the state of the vehicle driving and the current detection of the environmental information of the vehicle,according to the different driver assistance system functions to select the appropriate target,such as automatic emergency braking system,the above perceived effective longitudinal distance and lateral distance in the range of the vehicle to select the effective target of the collision in front of the vehicle,And according to this information combined with the vehicle status of the vehicle,vehicle control decisions,output demand reduction and other information.The appropriate response is completed by executing the system.This paper first summarizes the significance of the research of automatic emergency braking system and the current situation of research at home and abroad,lays the foundation for the research of automatic emergency braking system,and determines the research content of this paper and the arrangement of articles of each chapter:First,it analyzes the working principle by combining the basic composition of automatic emergency braking system.From the vehicle equipped with automatic emergency braking system of the surrounding environment perception,detected information??,effective??target screening,according to the vehicle status and road conditions to make the corresponding decision-making and vehicle control and other aspects of analysis;Taking into account the current relevant algorithm and the model of the related automatic emergency braking system,the safety parameter model of the TTC algorithm is proposed,and the use of hierarchical control thought and state machine control theory,such as speed speed and the passenger's feelings during braking,and the use of different braking target slower severance in different TTC ranges.At the same time to determine the conditions of different state switching,that is,to ensure the braking performance of the automatic emergency braking system,but also to ensure the comfort of the driver and passenger,while reducing the probability of abnormal braking occurring,combined with the vehicle test and C-NCAP test regulations and other requirements,the vehicle test requirements are summarized,At the same time,the automatic emergency braking system with CCRs,CCRm and CCRb test conditions,not only consider the C-NACP set for the corresponding speed of the test,while considering the driver use more,while not in the relevant regulations mentioned in the speed of the operating conditions,that is,C-NACP for the test speed,fine to ensure a high coverage of the scene.Combined with the above-mentioned test conditions for the whole vehicle test,and the test results of these tests to carry out test analysis,from the test results can be seen,under the action of automatic emergency braking system,to ensure braking in a short period of time,while the brake safety parking distance is basically within 0.5m to 1.2m,to ensure the consistency of braking performance.The test results show that the automatic emergency braking system designed in this paper can meet the design needs and improve the safety of the vehicle.