Commercial Vehicle AEBS Virtual Test Site Evaluation And Execution System Optimization

As one of the active safety technologies,automatic emergency braking system(AEBS)has been listed as one of the mandatory inspection functions of commercial vehicles before listing in China.This function can actively implement emergency braking under the condition of forward collision risk but no collision avoidance action by the driver,so as to avoid or reduce collision injury.Due to the high quality and high risk of commercial vehicles,there are great challenges in the testing,calibration and development of AEBS function on commercial vehicles.This paper establishes the evaluation model of AEBS virtual test site of commercial vehicles,which aims to reduce the risk of real vehicle testing,ensure the safety of testing commercial vehicles and testers,and speed up the development,testing and mass production of AEBS function of commercial vehicles,which has high practical significance and engineering value.Commercial vehicle AEBS pneumatic braking execution system is the key to the efficiency and accuracy of emergency braking command execution.In this paper,the time delay model of commercial vehicle AEBS pneumatic braking execution system is established,and the adaptive fuzzy PID control optimization algorithm is established in order to reduce the impact of time delay on emergency braking.The simulation results show that the optimized control can achieve the expected effect.The main research contents of this paper are as follows:(1)This paper analyzes the background and practical engineering significance of the commercial vehicle AEBS virtual test site evaluation and execution system optimization,briefly introduces the composition and function of ADAS and AEBS,analyzes the research status at home and abroad related to the subject,and puts forward the main research content and technical route of this paper.(2)The whole vehicle dynamics model of commercial vehicle AEBS is established,the structure and working principle of commercial vehicle AEBS pneumatic braking execution system are analyzed,and the pneumatic braking system model considering the time delay of commercial vehicle AEBS execution system is established,which is integrated with the whole vehicle dynamics model to prepare for the establishment of commercial vehicle AEBS virtual test field.(3)Based on the PreScan platform,the evaluation model of commercial vehicle AEBS virtual test field is established,and the TTC safety state early warning and braking model is established as the judgment logic of commercial vehicle AEBS in this paper.The TTC threshold of sub speed early warning and sub speed braking is formulated,and the modeling of the whole commercial vehicle AEBS virtual test field is completed.(4)Relying on an intelligent network test base to verify the effectiveness of commercial vehicle AEBS virtual test site,analyze the domestic and foreign commercial vehicle AEBS evaluation standards,summarize their commonalities and shortcomings,and formulate three typical scenarios for the effectiveness verification of commercial vehicle AEBS virtual test site in this paper: vehicle rear end collision scenario,vulnerable road user scenario and non-standard typical accident scenario.The results of real vehicle test and virtual test are analyzed to verify the effectiveness and rationality of the commercial vehicle AEBS virtual test field built in this paper,which can help the development,test and mass production of commercial vehicle AEBS.(5)The common control strategies of commercial vehicle AEBS pneumatic braking execution system are analyzed,the advantages and disadvantages are summarized,and the adaptive fuzzy PID control is selected as the time delay optimization strategy of commercial vehicle AEBS pneumatic braking execution system in this paper.The relationship between slip ratio and adhesion coefficient in the braking process is clarified,and the adaptive fuzzy PID control strategy of commercial vehicle AEBS pneumatic braking execution system with real-time slip ratio as the control object is established.Finally,it is verified that the adaptive fuzzy PID control strategy can meet the expected requirements of commercial vehicle AEBS execution system.