基于有限反馈比特率的事件触发控制系统稳定性条件  

Stability Conditions of Event-triggered Control Systems with Finite Feedback Bit Rates

作　　者：李博伦[1] 凌强[1] 陈家玉 李峰[1] 王嵩[1] LI Bolun;LING Qiang;CHEN Jiayu;LI Feng;WANG Song(Department of Automation,University of Science and Technology of China,Hefei 230027,Chin)

机构地区：[1]中国科学技术大学自动化系,安徽合肥230027

出　　处：《信息与控制》2018年第4期486-491,498,共7页Information and Control

基　　金：国家重点研发计划资助项目(2016YFC0201003)

摘　　要：研究了在事件触发采样机制下,基于有限反馈比特率的网络化控制系统的量化反馈控制问题.该系统中的信息通过共享的数字网络进行传输,为提高网络资源利用效率而采用了基于模型的事件触发控制策略,仅当某个误差量超出给定范围时触发采样.针对实际网络带宽的有限性,引入动态量化器使用有限比特对反馈信号进行量化.给出了使系统渐近稳定的事件触发条件,并给出了单次量化的比特数下界以确保系统存在大于0的最小触发间隔.最后通过仿真验证了所设计的控制策略的有效性.We study the problem of quantized feedback control in networked control systems at finite feedback bit rates under event-triggered sampling strategies. In such systems,information is transmitted through a shared digital network. To improve the efficiency of network resource utilization,we adopt a model-based event-triggered control strategy whereby sampling is triggered when a certain error variable exceeds pre-defined thresholds. To handle the limited bandwidth of real networks,we implement a dynamic quantizer to quantize feedback signals with a finite number of bits. We propose a triggering strategy by which systems can maintain asymptotic stability. Moreover,we provide a lower bound on the number of quantization bits in these systems to achieve a positive minimum inter-sampling time. Simulation results demonstrate the effectiveness of our proposed control strategy.

关 键 词：量化反馈控制 线性系统 事件触发 模型不确定性 

分 类 号：TP13[自动化与计算机技术—控制理论与控制工程]