Research advance and characteristics of Networked Control Systems with long time-delay

Long time-delay in networked control systems makes it more complicated for system modeling, analyzing and controlling. Long time-delay may remarkably degrade performance of system and easily make system be unstable. Focusing on the problem of long time-delay in networked control systems, the paper analyzes the existing reason of long time-delay, characteristics of long time-delay and its effect on performance of system. Based on summarizing the new research strategy and results of long time-delay, the problems to be further researched in networked control systems with long time-delay are pointed out.