Research On Redundancy Management And Bus Communication For Flight Control Computer

With the development of new and high performance UAV, the demand for functions andreliability of flight control system is higher and higher. As the core of the flight control system, Flightcontrol computer usually uses the redundant method to improve the reliability of the task. It isnecessary to research the redundancy management and bus communication according to the hardwareconfiguration of the redundant flight control computer based on CAN bus.In the process of design and research, some key issues are needed to solve, that is: With theredundant resources increasing, firstly, it needs to design the redundant management and CAN buscommunication module.Secondly, it will increase the data flows of the CAN bus, and the bus load isaggravating, so research work for a new bus-FlexRay bus is promoted so as to lay the foundation forthe engineering realization of FlexRay replace CAN used on the flight control computer.According to these problems, detailed design was carried out.Fristly, Design of redundancymanagement: task synchronization was completed; monitoring and voting strategies of the redundantsignal, fault detection and diagnosis, failure reconstruction and recovery strategies were determined.Secondly, Design of CAN bus communication: the CAN bus communication protocol and the linkswere designed. And then, Design of FlexRay bus communication: the FlexRay bus networkcommunication solution was determined according to the characteristics of the flight control computerbased on CAN, and FlexRay communication protocol was designed by the demand of the flightcontrol computer data interaction.Finally, to verify correctness and rationality of the overall program of system design and thepractical feasibility and performance of the solutions of the key issues, corresponding tests weredesigned: for the sample redundant flight control computer, the redundancy management test and thesemi-physical simulation test were carried out; for the FlexRay network, the FlexRay buscommunication protocol verification was carried out. The experimental results show that the programof system design was reasonable, and its function and performance meet the design requirements forflight control computer. FlexRay communication can also satisfy the requirements of flight controlcomputer data interaction.