Abstract
Model-based design tools supporting the Functional Mockup Interface (FMI) standard, often employ specification languages ideal for modelling specific domain problems without capturing the overall behavior of a Cyber-Physical System (CPS). These tools tend to handle some important CPS characteristics implicitly, such as network communication handshakes. At the same time, formal verification although a powerful approach, is still decoupled to FMI co-simulation processes, as it can easily lead to infeasible explorations due to state space explosion of continuous or discrete representations. In this paper we exploit co-modelling and co-simulation concepts combined with the injection of formal verification results indirectly in a model-based design workflow that will enable verification engineering benefits in a heterogeneous, multi-disciplinary design process for CPSs. We demonstrate the approach using a Heating, Ventilation and Air Conditioning (HVAC) case study where communication delays may affect the CPS system’s analysis. We model discrete events based on the Vienna Development Method Real-Time dialect, Continuous Time phenomena using Modelica, and communications using PROMELA. Results are considered and inspected both at the level of constituent models and the overall co-simulation.
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Notes
- 1.
The User component is a basic abstraction used only to enable requests to the system during co-simulation.
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Acknowledgments
This work is supported by the INTO-CPS H2020 project: Integrated Tool Chain for Model-based Design of Cyber-Physical Systems. Funded by the European Commission-H2020, Project Number: 664047.
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Couto, L.D., Basagiannis, S., Ridouane, E.H., Mady, A.ED., Hasanagic, M., Larsen, P.G. (2018). Injecting Formal Verification in FMI-Based Co-simulations of Cyber-Physical Systems. In: Cerone, A., Roveri, M. (eds) Software Engineering and Formal Methods. SEFM 2017. Lecture Notes in Computer Science(), vol 10729. Springer, Cham. https://doi.org/10.1007/978-3-319-74781-1_20
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