Electric Vehicles Ttcan Bus Technology Research

Based on the CAN protocol, TTCAN protocol is both event-triggered andtime-triggered. TTCAN, in which the communication is decided by time, improvesthe real-time performance of the network and makes the communication meet thedemand of security critical real-time system and the increasing bus load. At the sametime, the research on CAN makes good software and hardware environment forTTCAN.TTCAN protocol, the software and hardware condition and the means of networkperformance test are all introduced.According to ISO11898-4, the communication based on TTCAN protocol isimplemented by programming on the real-time simulation system for the CAN busand the system is turned into a TTCAN network. It is concluded that the ECU inTTCAN network must have a steady and reliable local time and relevant timesynchronization and timing mode.The performance of the network in the powertrain of hybrid electrical vehiclebased on TTCAN protocol is tested and analyzed. The results indicate that profitingfrom time-triggered mechanism and the scheduling in the system matrix, the periodicmessage is not impacted by other messages in the network, the conflict among themessages on the bus is depressed, the real-time performance and bus utilization areboth improved in the TTCAN network.The network performance of TTCAN and CAN are compared on equal condition.The real-time performance in the TTCAN network is always good though the busloading is high.The fault diagnosis and fault tolerant for the time master and reference messagein the TTCAN are also researched in this dissertation. And the result indicates that thenetwork performance is not impacted by the time master's and reference message'sfault and proves the correctness of the means of redundancy for time master andreference message.