Journal of Systems Engineering and Electronics ›› 2008, Vol. 19 ›› Issue (2): 385-390.

• SOFTWARE ALGORITHM AND SIMULATION • Previous Articles     Next Articles

Uniformed model of networked control systems with long time delay

Zhu Qixin1, Liu Hongli2 & Hu Shousong3   

  1. 1. School of Electrical & Electronics Engineering, East China Jiaotong Univ., Nanchang 330013, P. R. China;
    2. School of Nature Science, East China Jiaotong Univ., Nanchang 330013, P. R. China;
    3. Coll. of Automation Engineering, Nanjing Univ. of Aeronautics and Astronautics, Nanjing 210016, P. R. China
  • Online:2008-04-21 Published:2010-01-03

Abstract:

Feedback control systems wherein the control loops are closed through a real-time network are called networked control systems (NCS). The defining feature of an NCS is that information is exchanged using a network among control system components. Two new concepts including long time delay and short time delay are proposed. The sensor is almost always clock driven. The controller or the actuator is either clock driven or event driven. Four possible driving modes of networked control systems are presented. The open loop mathematic models of networked control systems with long time delay are developed when the system is driven by anyone of the four different modes. The uniformed modeling method of networked control systems with long time delay is proposed. The simulation results are given in the end.