电动助力转向(electric power steering，EPS)系统是车辆常用的转向执行器，其失效将严重影响驾乘人员的安全。为提高EPS系统的安全性与可靠性，基于功能安全标准建立EPS系统安全冗余机制:基于ISO26262对EPS系统进行研究，通过相关项定义、危害分析与风险评估(HARA)，得到系统的功能安全目标与需求，并对其进行分配;设计EPS系统架构、容错机制，以提高系统的安全性;最后，对所设计的安全冗余机制进行台架试验。结果表明，在单侧桥驱芯片故障、单侧电机位置传感器故障、双侧电机位置传感器故障等故障注入的情况下，系统能够实现预期响应，满足功能安全目标，验证了所设计安全冗余机制的有效性。
Research on safety redundancy of automotive EPS system based on functional safety
Electric power steering(EPS)system is a commonly used steering actuator for vehicles at present,and its failure will seriously affect the safety of drivers and passengers.A safety redundancy mechanism for the EPS system was established based on functional safety standards.Based on ISO26262,the EPS system was studied.Through the item definition,hazard analysis and risk assessment,the safety goal and functional safety requirements of the system were obtained and allocated.The architecture and fault-tolerant mechanism of EPS system were designed to improve the security of the system.Finally,the designed safety redundancy mechanism was tested on the bench.The results show that the system can achieve the expected response and meet the functional safety goal under the condition of fault injection such as unilateral bridge driver IC fault,unilateral motor position sensor fault and bilateral motor position sensor fault,which verifies the effectiveness of the designed safety redundancy mechanism.
electric power steering(EPS)systemfunctional safetysystem architecturefault injection
NETL
NSTL
万方数据
维普
