Abstract: The flight control system is a key component of an aircraft, responsible for core functions such as flight attitude stability, trajectory control, and fault handling. Centralized flight control systems are constrained by computing resources and communication capabilities in terms of task synthesis and functional expansion, making it difficult to meet the requirements of modern flight control systems. Although distributed flight control systems have improved their performance in terms of fault tolerance and scalability, there still exists the problem of single point failure of bus control nodes. To solve the above problems, a high fault tolerance distributed flight control system architecture based on TTE network is proposed. The task scheduling problem is modeled based on DAG graph and two fault-tolerant methods for tasks are utilized. A distributed semi-physical verification environment based on network protocols is built, and the fault-tolerant operation of the network distributed system architecture is verified. The results indicate that the proposed network distributed structure and its fault-tolerant algorithm can improve the fault-tolerant operation capability.

Key words: distributed architecture, fault-tolerant, flight control system, DAG graph, TTE network, EFT algorithm, PB algorithm