Large Aircraft Power Supply System Processor Design

Large plane uses the mixed power distribution system which is based on the technology of Electrical Multiplexer(EMUX). As the kernel of the power distribution system, Power System Processor implements electrical load scheduling and management, system fault process and fault recovery, system rebuilding. This thesis mainly discusses the design and implement of Power System Processor.Power System Processor is a typical embedded real-time multi-tasking system, which requests high performance in real-time response, reliability and the adaptation to environment, in order to ensure software quality, we adopt reliabile software and hardware platform, real-time system analysis and design methods. Based on the Real-Time Operating System VxWorks, a PC/104 SCM/SPT CPU embedded computer is employed in the project. In the design and implement of system tasks, the main techniques are realized as following: setting real-time memory database and its storage structure and search algorithm;setting two-level load priority management and system rebuilding algorithm to implement system fault process, recovery;system introducing Compact Flash Memory to save history data;It meets the double backup request that use 1553B bus to communicate, re-send and timeout control make the system reliable;It sets up the communication with the emulational system. The real time tasks of PSP are specified based on the software model and the Rate-Monotonic Scheduling(RMS) is used to schedule the run of tasks.