摘要
线控转向(SBW)系统是发展未来智能汽车的热点。为提高SBW系统的安全性、可靠性,根据国际标准组织(ISO)的"ISO 26262",展开了SBW系统功能安全的概念设计。根据系统的功能需求和结构分析,分析了道路车辆使用场景;对系统潜在危险进行了辨识,用规则集的方法,评估了汽车安全完整性等级(ASIL),提出2个功能安全目标(中高速行驶时应防止SBW发生非意向的转向力矩超限和无法转向)以及功能安全概念,并分配到系统的架构元素中。测试得到该架构可及时检测故障,并能在故障后切换为备份机构。结果显示:本系统功能安全框架可以在系统出现故障时及时进入安全状态,从而保障驾驶员的安全。
Designed a functional safety concept for a steer-by-wire(SBW)system,which is highly regarded for future intelligent vehicles,based on the“road vehicle functional safety standard of the ISO 26262”by the International Organization for Standardization(ISO)to improve the safety and reliability of the SBW system.Analyzed some possible situations of road vehicle for the requirements of reliability according to the analyzing to the system functional requirements and architectures.Identified some possible hazards and evaluated the automotive safety integration levels(ASILs)using a rule-set method.Proposed two safety goals that the system should avoid unintended steering torque beyond function limits and should avoid steering function loss in high speed.A functional safety concept was designed and then distributed into architecture elements to detect the faults on time and to switch to backup architectures after faults.The results of test show that the functional safety architectures of the SBW system improve the reliability effectively and ensure driver’s safety by entering safety state when break down.
作者
荣芩
吴晓东
许敏
RONG Qin;WU Xiaodong;XU Min(Institute of Automotive Engineering,Shanghai Jiao Tong University,National Engineering Laboratory for Automotive Electronic Control Technology,Shanghai 200240,China)
出处
《汽车安全与节能学报》
CAS
CSCD
2018年第3期250-257,共8页
Journal of Automotive Safety and Energy
