Synchronous programming of a automatic control applications using ORCCAD and ESTEREL

摘要

Automatic control systems are typical examples of hybrid systems where continuous time aspects, related to control laws, must be carefully merged with discretetime aspects related to control switches and exception handling. These two aspects interact in real-time to ensure the nominal behavior of the system and allow for safe and graceful degradation. In a mixed synchronous/asynchronous approach, ranging from user requirements to run-time code, ORCCAD provides formalized control structures, the coordination of which is specified using the ESTEREL synchronous language. ORCCAD is actually a set of CAD tools, that have been designed and integrated to help the users through programming, formal verification, real-time code generation, and implementation processes.