基于事件触发的智能家居温度控制系统设计

Design of smart home temperature control system based on event-triggered mechanism

在智能家居温度控制系统中,当环境温度波动不大时,采用传统的时间触发控制模式,将造成不必要的节点能量浪费,且节点较多时将加剧因信道竞争引起的丢包与延时现象。为了解决上述问题,在此介绍了基于事件触发的温度控制系统。无线传感节点周期采样环境温度值,事件触发器根据触发条件决定是否发送当前采样值;当执行节点收到新的采样值时,利用随机变异粒子群算法更新控制律。仿真表明,在保证闭环系统输入状态稳定且达到控制目标的基础上,与时间触发相比,事件触发机制下无线传感节点需要传送的采样值大大降低。说明事件触发机制有利于资源受限的无线传感器执行器网络在智能家居中的应用。

In smart home temperature control system,when environment temperature fluctuates slightly,it is inadvisable for temperature control system to adopt traditional time-triggered mode,since latency and packet loss are apt to deteriorate due to severe channel competition and a waste of node energy is inevitable. In order to solve the problem,a novel temperature con-trol system based on event-triggered mechanism is proposed. temperature is sampled periodically by wireless sensing node. Ac-cording to triggering condition,event-trigger determines whether the current sample should be transmitted or not. When actuator node receives new sample value,the control law is updated with random mutation particle swarm algorithm. Simulation shows that,on the premise that input state is stable and meets control requirement,compared with time-triggered mode,less samples are needed to be transmitted when using event-triggered mechanism,which brings convenience to application of resource-con-strained wireless sensor and actuator network in smart home.