Abstract: To meet the requirement of automotive intelligentizing, the next step in the direction of automotive bus is to support both time-and event-triggered communication services and to attain more flexible of design and scheduling. But controller area network (CAN) protocol is inefficient for time-triggered messages, while time-triggered controller area network (TTCAN) can efficiently fulfill joint support for both event- and time-triggered traffic but lacks flexibility in message scheduling. To these questions, a new dynamic planning-based protocol that is flexible in time-triggered controller area network (FTTCAN) is analyzed. And the elementary cycle comprising of two phases and real-time analysis method for communications of messages in the two phases are explained. Then an FTTCAN-bus system of electric vehicle based on FTTCAN protocol is designed, and the scheduling strategy of signals based on dynamic planning is adopted. And performance analysis of the new system is carried out by comparing with CAN system. Finally, operation test of FTTCAN protocol is carried out on CAN bus development system. The comparison and test results verify that FTTCAN is a good way to design automotive bus system, which can meet the requirements of supporting both time-and event-triggered communication services and being flexible in design and scheduling.

Key words: Dynamic planning, Electric vehicle, Flexible time triggered controller area network(FTTCAN), Real time analysis