Improvement and Simulation Analysis of CAN Real-time Performance for Regional Computer Interlocking

Regional computer interlocking system is implemented with the method of dispatching supervision and centralized interlocking. The extension of physical media is used for regional control of its security communication network. The real-time requirement of security protocol is gradually increasing with the large number of adjacent sites incorporated into the system. This paper analyzes the transmission delay of Controller Area Network(CAN)bus(used for existing regional computer interlocking system communication network)between stations,and proposes a dynamic priority algorithm to improve the real-time performance. The simulation result shows that the improved CAN bus protocol can reduce the maximum delay between nodes by changing the load. In addition,it can ensure the real-time performance of different types of nodes,and can meet the requirement of regional computer interlocking system for network communication.