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信息物理融合系统(cyber-physical system,简称CPS)蕴藏着巨大的潜在应用价值.时间在CPS中起到非常重要的作用,应该在需求早期阶段明确.提出了一个基于逻辑时钟的CPS时间需求一致性分析框架.首先,构建了CPS软件的时间需求概念模型,提供时间需求和功能需求的基本概念,并给出了概念模型的形式化语义;然后,在模型制导下,从CPS的交互环境特性和约束中提取出其软件时间需求规约.基于形式化语义,定义了时间需求规约的一致性特性.为了支持形式化验证,将时间需求规约转换成NuSMV模型,用CTL公式表述要检测的特性,并使用NuSMV工具实施了一致性检测.
The cyber-physical system (CPS) holds huge potential application value.Time plays a very important role in CPS and should be clear in the early stage of demand.Analyzing the consistency of CPS time based on logical clock First of all, the concept of time requirement of CPS software is constructed, the basic concepts of time requirement and function requirement are provided, and the formal semantics of concept model are given. Then, under the guidance of model, And constraints, the software time requirements specification is extracted.Furthermore, the conformance characteristics of time requirement specification are defined based on formal semantics.In order to support formal verification, the time requirement specification is transformed into NuSMV model, and the CTL formula is used to describe the characteristics to be detected, Consistency testing was performed using the NuSMV tool.