In - Line Ignition System Based On Bus Control

In-line ignition system, without any mechanic effectors, is an extension of in-line fuze, which may enhance the functional reliability of system by simplifying the complexity of traditional ignition system design. It is a leading trend in aerospace ignition development utilizing several low-power ignitions as a substitute for single high-power ignition. Therefore, in-line ignition system based on bus control, featuring by its integrated, extensible and networking design, will be significant in enhancing the system safety and reliability.Based on the operating principle of in-line ignition system and the characteristic of bus-controlling electronic military system, a basis for the type selection of CAN bus is introduced, which leads to an appropriative communication protocol of the in-line ignition system. A new CAN message format is redefined on the basis of traditional CAN protocol message format to meet the demand of communication protocol in system function and node number. With the guidance of the redefined appropriative communication protocol, a prototype is developed including the chief circuit in the system:main controller and node of in-line ignition system.Moreover, a test system is built up to test the communication parameters of CAN bus in in-line ignition system prototype, including bus transmission distance, responding time, node ignition synchronization and so on. The result shows, the setting of bit timing has a great impact on bus transmission distance and node receiving synchronization. The parameters in system bus, such as transmission speed, transmission time, node numbers and message format, affect and interact with each other, which validates the design of the appropriative communication protocol. The responding time improved from5ms to160us,and the ignition synchronization improved from ms level to us level.Finally, the network performance of the system and the response mode of node are also tested.