The Research On TTCAN Network Of Hybrid Electrical Vehicle

With rapid development of automobile electronic technique , application of advanced network technology in automobile is accelerated. The fact that more and more digital electronic control units are used in hybrid electric vehicles makes it more significant to develop correspondence network technology. Supported by major project "control algorithm and fundamental technology study of electric vehicle" under "High-Tech Research and Development Program of China", the research and designing of vehicle communication system based on timer-triggered controller area network (TTCAN) protocol have been carried out for powertrain of EQ6110 hybrid electric bus.With the analysis on operation characters of EQ6110HEV powertrain and subsystems, the function of each node and the information exchanged among controllers are determined. The vehicle network is designed and the protocol of TTCAN application layer for HEV communication system, which is compatible with SAE J1939, is completed.After adding application and session layers in network simulation system CANoe, the network model of EQ6110 is established based on TTCAN protocol. In the simulation environment, network performance of the designed TTCAN protocol is studied and analyzed. For example, the factors such as number of nodes, message priority and the length of data field which may affect real-time performance of the network and baud rate of the network which may affect bus loading are studied via designed tests.Besides simulation of TTCAN network in network simulation software, hardware simulation of TTCAN network is also implemented by exploring communication experimental platform. After Verifying the reliability and stability of the platform, communication tests of the network with two different protocols TTCAN and CAN are carried out. The result shows that the performance of TTCAN network in the aspects of real-time performance, bus loading, throughput and so on superior to CAN network. From the result the conclusion is that TTCAN protocol which have good performance can satisfy the requirement of the development in network technology in automobile in the future.