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For modelling hybrid systems, we have extended Event B based on its framework with the differential event. The differential event describes continuous behaviors of hybrid systems by differential equations and evolution constraint, whose proof obligations provide dynamical properties of a model. In order to ensure the safety and reliability of a model, proof obligations should be proved. It is difficult...
In recent years, with gradual application of formal verification methods to automatic train control (ATC) systems, the problem of verification failure occurs due to the complexity of the verification system. In order to solve this problem, this paper proposes a safety attribute based projection for the ATC systems. We describe this verification system using Problem Frames approach and define projection...
Automation and high coverage are two essential industrial technical requirements of qualified testing method for safety-critical systems. The ioco-testing method is a sound and well-defined formal automation testing technique for labelled transition system. However, when we apply this method to a train control system developed by our industrial partner, we find that some testing requirements are not...
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