Study Of The Conmmunication Network Of Distributed Computer Interlocking System Based On Multi-Agent

The Computer Interlocking System(CIS) is used in the railway station signal control system to ensure the traveling safety, improve the working conditions of the traveling worker and improve the transportation efficiency. The concentrated control mode is currently adopted in the CIS which takes interlocking computer as the core, the interlocking computer and interface are the concentration position of the system, whose reliability and security influence entire CIS, if they break down, the system will generate large influence surface.This thesis raise a kind of distributed design scheme based on the Multi-Agent technology by analyzing the computer interlocking logic criterion and applying the Multi-Agent technology and the distributed control technology. This thesis mainly designs a set of communication network using the CAN bus technology and industrial-Ethernet technology, which connects each scattered agent to compose a distributed Multi-Agent system, enables the new system to intelligently control, dispersedly interlocking calculate and networked transmit control information, and enhances the reliability and security of the system. In this thesis, research is focused on the followings:By summarizing and analyzing the characteristic of the Multi-Agent technology, the industrial-Ethernet technology and the CAN bus technology, combining the CIS own characteristic, this thesis analyzes the feasibility and the superiority when it is used in the CIS.By combining the industrial-Ethernet technology and the CAN bus technology, the integral design of the distributed CIS based on Multi-Agent is proposed, in which the CAN bus act as a link to connect interlocking agent interconnected seamlessly with the industrial-Ethernet in upper layer. Through the contrast of structure characteristics between the existing CIS and the distributed CIS, the advantage of the distributed CIS is got.Designing software architecture and hardware architecture of the communication network, the manipulation indication machine adopting high performance industrial PC monitor and control interlocking agent by Winsoket network programming. CAN-Ethernet gateway is designed by combining DSP and the embedded microprocessor, which simplifies network protocol, makes system practical and simple, the CAN interface and Ethernet interface are detailedly designed. The interlocking agent takes ARM microprocessor as the master-control unit to realize communicate with other agent and the manipulation indication machine.CAN message delay is primary factor affecting real-time performance. This thesis mainly analyzes media access delay by mathematical model, uses Matlab simulation to get primary factor affecting media access delay, and proposes some improvement scheme to improve system's real-time performance. Finally, by constructing distributed system with the Switcher Ethernet, simulating the distributed CIS based on Multi-Agent, and simulating route creating and manual delay release to validate design feasibility of the distributed CIS based on Multi-Agent.