Modelling the Embedded Control System Using iUML-B Pattern State Machine

Abstract

Developing the formal model based on the Event-B design pattern is an excellent method to improve the development efficiency of the embedded control system and improve the reusability of the formal model. However, the instantiation of the Event-B design pattern requires the manual writing of a large number of model codes, which brings a great deal of learning cost and coding burden to the engineering staff. In this paper, we propose a modelling approach for formal development of control systems based on the application of iUML-B state machine patterns to model the four synchronization patterns of the typical control system. Then, we use the instantiation of iUML-B pattern state machine to establish a typical multilevel control system's Event-B model. The simulation results show that the event trace of the model obtained using our method is the same as that of the corresponding model obtained using the traditional Event-B design pattern. Compared with the traditional Event-B design pattern method, our method can greatly reduce the manual coding burden in the modelling process. The system model expressed using the iUML-B pattern state machine can be easily mapped to the labelled transition system so as to verify the behavioural properties of the model.

An Integrated Formal Method Combining Labeled Transition System and Event-B for System Model Refinement

“…In our work, we first use the states and edges linked with events in the iUML-B to build system models, and use the pattern state machine proposed in our previous work to improve reuse rate and programming efficiency [20], and then use Rodin tools to automatically generate the Event-B model. The growth trend of the main elements in the iUML-B model with the increase of the refinement layer is shown in Figure 19.…”

“…The growth trend of the main elements in the iUML-B model with the increase of the refinement layer is shown in Figure 19. Since one edge can link multiple events, the number of edges is greatly reduced, and modeling becomes easier [20]. Although the variables and invariants in the code still need to be written manually, the guards and actions with the highest proportion can be automatically generated.…”