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Simulation and synchronization of distributed real-time systems

Today we are very much dependent on different kinds of real time systems. Usually, a real time system is a system which is interacting with a physical environment with sensors or activators. There are many advantages by replacing mechanical components with electrical ones. For instance, it is usually cheaper and possible to add new functions to the device without replacing the electronic part, which would have been necessary with a mechanical one. The possibility of simulating a distributed system is used throughout the vehicle industry. With the simulation of connected sub systems, using modeled buses and real time kernels, one could increase the correctness of the behavior of the system and consequently decrease the amount of time spent later in the developing process. In this master thesis we used modeled CAN-buses and real time models to simulate the connection and execution time of the systems. The simulation results are used to validate the functionality of the distributed system. Additionally, a worst-case response time analysis is made to set timing constraints on the system to fulfill given deadlines. During the work, different settings of the network are tested to analyze the system frequency needed to sustain deadlines and correctness on the network.

Andreas Karlsson and Joakim Leuhusen


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