构建主观网络框架,评估自动驾驶系统整体功能状态。
Functionality Assessment Framework for Autonomous Driving Systems using Subjective Networks
- 用主观网络建模组件依赖与冗余关系
- 可融合矛盾评估结果并识别故障部件
- 适用于真实自动驾驶系统的功能诊断
在复杂的自动驾驶(AD)软件系统中,各组件的功能性对安全运行至关重要。现有研究多以独立的安全或性能指标评估单个组件,但组件间的依赖、冗余、错误传播及功能冲突使得难以整合成系统整体功能图景。数据在各组件间传递,任一环节失效都会影响全局判断。本文提出一种新框架,通过主观网络(Subjective Networks, SNs)构建系统评估表示,能有效识别故障部件,并提供灵活的方法处理组件间的矛盾评估、依赖关系和冗余结构。基于真实自动驾驶系统数据,该框架成功实现了对整体功能状态的推断,验证了其在复杂系统评估中的有效性。
原文摘要 · Abstract (English)
In complex autonomous driving (AD) software systems, the functioning of each system part is crucial for safe operation. By measuring the current functionality or operability of individual components an isolated glimpse into the system is given. Literature provides several of these detached assessments, often in the form of safety or performance measures. But dependencies, redundancies, error propagation and conflicting functionality statements do not allow for easy combination of these measures into a big picture of the functioning of the entire AD stack. Data is processed and exchanged between different components, each of which can fail, making an overall statement challenging. The lack of functionality assessment frameworks that tackle these problems underlines this complexity. This article presents a novel framework for inferring an overall functionality statement for complex component based systems by considering their dependencies, redundancies, error propagation paths and the assessments of individual components. Our framework first incorporates a comprehensive conversion to an assessment representation of the system. The representation is based on Subjective Networks (SNs) that allow for easy identification of faulty system parts. Second, the framework offers a flexible method for computing the system's functionality while dealing with contradicting assessments about the same component and dependencies, as well as redundancies, of the system. We discuss the framework's capabilities on real-life data of our AD stack with assessments of various components.
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