BreachFlows: Simulation-Based Design with Formal Requirements for Industrial CPS (Extended Abstract)

Cyber-Physical Systems (CPS) are computerized systems in interaction with their physical environment. They are notoriously difficult to design because their programming must take into account these interactions which are, by nature, a mix of discrete, continuous and real-time behaviors. As a consequence, formal verification is impossible but for the simplest CPS instances, and testing is used extensively but with little to no guarantee. Falsification is a type of approach that goes beyond testing in the direction of a more formal methodology. It has emerged in the recent years with some success. The idea is to generate input signals for the system, monitor the output for some requirements of interest, and use black-box optimization to guide the generation toward an input that will falsify, i.e., violate, those requirements. Breach is an open source Matlab/Simulink toolbox that implements this approach in a modular and extensible way. It is used in academia as well as for industrial applications, in particular in the automotive domain. Based on experience acquired during close collaborations between academia and industry, Decyphir is developing BreachFlows, and extension/front-end for Breach which implements features that are required or useful in an industrial context.