小型涡扇发动机分布式控制系统总线触发机制研究

Research of Bus Communication Trigger Mechanisms in Distributed Engine Control System for Small Turbofan Engine

为分析比较2种总线触发机制(时间触发和事件触发)对航空发动机实时控制的影响,以某小型涡扇发动机为对象,采用智能节点型分布式结构,构建了其分布式控制系统数字仿真平台;利用True Time/Matlab工具箱展开网络实时仿真研究,系统各节点通过CAN总线进行数据通信。以此仿真平台为基础,对2种触发机制下发动机的转速响应以及对应的时延统计结果表明:在事件触发机制下发动机转速超调量比时间触发机制下的大2.32%;在不同网络负载下,在事件触发机制下的时延大小和尖峰数均大于在时间触发机制下的。最终认为时间触发机制更适合于航空发动机分布式控制系统。

Event trigger and time trigger mechanisms were studied in distributed control applications.The digital simulation platform was built for a small turbofan engine based on the smart system architecture.TrueTime/Matlab toolbox was used to conduct the network real-time simulation.CAN bus was select as the communication medium for the smart nodes.The engine rotor speed response and the delay statistics of the two different triggered system were compared on the basis of the simulation platform.It shows that the overshoot of the engine rotor speed in time triggered system is larger than that in the event triggered system.In addition,the delay and its peak number in the time triggered system are larger than those in the event triggered system under different network load.Finally,it is concluded that time trigger mechanism is more applicable for distributed engine control system.