MDM: A Mode Diagram Modeling Framework
This work addresses a gap in formal modeling for safety-critical embedded systems like spacecraft and automotives, though it appears incremental as it builds on existing techniques like statistical model checking.
The authors tackled the lack of domain-specific formal modeling languages for periodic control systems in safety-critical embedded domains by proposing a mode diagram modeling framework, which was applied to real-life case studies and helped detect two design defects in spacecraft control systems.
Periodic control systems used in spacecrafts and automotives are usually period-driven and can be decomposed into different modes with each mode representing a system state observed from outside. Such systems may also involve intensive computing in their modes. Despite the fact that such control systems are widely used in the above-mentioned safety-critical embedded domains, there is lack of domain-specific formal modelling languages for such systems in the relevant industry. To address this problem, we propose a formal visual modeling framework called mode diagram as a concise and precise way to specify and analyze such systems. To capture the temporal properties of periodic control systems, we provide, along with mode diagram, a property specification language based on interval logic for the description of concrete temporal requirements the engineers are concerned with. The statistical model checking technique can then be used to verify the mode diagram models against desired properties. To demonstrate the viability of our approach, we have applied our modelling framework to some real life case studies from industry and helped detect two design defects for some spacecraft control systems.