Research On Redundant CAN Bus In Marine Engine Control System

This problem comes from the project developing marine engine control system (ECS) , which was imported from Germane MTU . Its main aim is to develop marine engine control system possessing dependent intellectual property right by virtue of MTU's key technology.The main research object of this paper is ECS's communication interface (ECI) which is in charge of reliable communication between the remote control system at upper level and the engine control system at lower level and dialogue between people and engine, exchanging protocol between RS-422 and CAN-bus is one of this paper's main task, Because of CAN-bus used for communication in remote control system , and RS-422 bus in the engine control system , besides , designing monitor and switch circuits to coordinate the two buses to communicate is the other task of this paper, because of redundant buses used in the upper level and the lower one. The continuing work based on the two tasks will be had .According to the function demands, primary layout of ECI is planed firstly. Secondly, reliability analysis is applied by comparing reliability indexes of different layout structure. As a result, the best one is selected which adopts parallel-series connection mode. Based on this layout, malfunction detection, switch method, necessary alarm facilities and Human-Machine interface are designed. After hardware and software development being completed, linkage debug was had to improve whether whole design is feasible.Through visual window displaying the result and alarm facilities' real-time showing the artificial disturb, we can get the conclusion that CAN bus and Fault tolerance technology make ECS's reliability and real-time increased.