With the development of information technology and control theory, the networked control system is a new control system after fieldbus control systems. The networked control system is based on Ethernet and TCP/IP for control and information transmission. Due to the unpredictable delay of Ethernet and non-real-time of the TCP/IP protocol, research on real-time protocols for networked control systems is of great theoretical significance and practical value. Main work and contributions in this dissertation are described as follows. Firstly, the model of the TCP protocol for networked control systems is presented. The experiments validate the proposed model. Secondly, a new real-time TCP slow start algorithm is presented, based on the band evaluation method. The simulation shows the real time and reliability of this model is superior to that of the traditional TCP protocol. Thirdly, a new transmission protocol named CTP/IP stack is realized in this dissertation. This protocol realizes the communication traffic control based on band evaluation. Fourthly, the protocol based on hard real-time OS is realized. The task scheduler is improved to strengthen the real-time of the stack. Compared experiments are carried out between the CTP/IP and TCP/IP and the results show the throughput and real-time of the new protocol stack is improved. Finally, based on the CTP/IP protocol stack, a graphic monitoring system for networked control systems is designed, which is an example for the research and application of the real-time protocol for networked control systems
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