重庆理工大学学报(自然科学) ›› 2024, Vol. 38 ›› Issue (2): 32-44.

• 车辆工程 • 上一篇    下一篇

智能车变道决策规划系统的预期功能安全研究

罗 石,李灵恩,丁华,吴承航,过永强   

  1. 江苏大学汽车与交通工程学院
  • 出版日期:2024-03-22 发布日期:2024-03-22
  • 作者简介:罗石,男,博士,副教授,主要从事汽车电子与控制技术、嵌入式软件开发研究,E-mail:luoshi@ujs.edu.cn;通信作者李灵恩,男,硕士研究生,主要从事预期功能安全研究,E-mail:1534449853@qq.com。

Research on the safety of the intended functionality of intelligent vehicle lane change decision planning system

  • Online:2024-03-22 Published:2024-03-22

摘要: 随着智能驾驶汽车快速发展,预期功能安全(safety of the intended functionality,SOTIF)愈发凸显其重要性。自动变道控制系统作为自动驾驶系统的重要组成部分,在决策规划层面存在SOTIF不足的风险。基于ISO21448和系统过程理论(system-theoretic process analysis,STPA),对车辆变道决策规划系统的预期功能安全进行分析,找到潜在的危害触发事件并得到相应的安全目标。针对安全目标进行算法改进,综合考虑车型、车速、路面状况等行驶因素,利用高斯过程回归和模糊综合评价的方法得出目标车辆加速度用以评估当前变道安全性。结合最小变道时间及变道终点确定最优变道轨迹,并在变道过程中实时更新周围车辆行驶状态,利用提出的安全系数判断本车当前的安全状态并采取不同的变道措施,以保证车辆安全变道或在紧急情况无法完成变道时可以安全返回。建立验证场景,对不同场景下功能改进前后系统的风险进行对比。结果表明:功能改进后系统的风险显著降低,变道过程中的安全水平明显提高。

关键词: 智能驾驶, 变道, 预期功能安全, 风险评估

Abstract: With the rapid development of intelligent vehicles,the Safety of the Intended Functionality(SOTIF)is becoming increasingly important.As a critical component of autonomous driving systems,the automatic lane change control system poses inherent risks in decision-making and planning.This paper proposes an analysis process for the SOTIF of a vehicle lane-change decision-making system,which is based on ISO 21448 and the Systems-Theoretic Process Analysis(STPA)methodology.By integrating multiple perspectives,such as vehicle type,speed,and road conditions,the analysis process derives safety goals and improves algorithms from scenarios.The evaluation of the target vehicle’s acceleration to assess the safety of the current lane change is conducted by Gaussian process regression and fuzzy comprehensive evaluation.The optimal lane-change trajectory is determined based on the minimization of the lane change time and the desired lane endpoint.Throughout the lane-change process,the driving states of the surrounding vehicles are continuously updated,and the current safety status of the vehicle is evaluated using a proposed safety coefficient.Different lane change measures are then taken to ensure a safe lane change or a safe return in emergency situations.Finally,a verification scenario is built to compare the risks of the system before and after functional improvements under different scenarios.Our results show the risk is significantly reduced and the safety level during the lane change process is markedly improved after functional improvements.

中图分类号: 

  • 智能驾驶