This paper provides a survey on time-delay approach to networked control systems (NCSs). The survey begins from a brief summary on fundamental network-induced issues in NCSs and the main approaches to the modelling of NCSs. In particular, a comprehensive introduction to time-delay approach to sampled-data and networked control is provided. Then, recent results on time-delay approach to event-triggered control are recalled. The survey highlights time-delay approach developed to modelling, analysis and synthesis of NCSs, under communication constraints, with a particular focus on Round-Robin, Try-once-discard and stochastic protocols. The time-delay approach allows communication delays to be larger than the sampling intervals in the presence of scheduling protocols. Moreover, some results on networked control of distributed parameter systems are surveyed. Finally, conclusions and some future research directions are briefly addressed.

本文提供了对网络控制系统（NCS）的时延方法的调查。该调查从对NCS中由网络引起的基本问题以及对NCS建模的主要方法的简要概述开始。特别地，提供了对采样数据和网络控制的时延方法的全面介绍。然后，回顾关于事件触发控制的时滞方法的最新结果。该调查重点介绍了在通信限制下为NCS建模，分析和综合而开发的时延方法，特别侧重于轮循，一次尝试丢弃和随机协议。在存在调度协议的情况下，时间延迟方法允许通信延迟大于采样间隔。此外，对分布式参数系统网络控制的一些结果进行了调查。最后，简要介绍了结论和一些未来的研究方向。