Design and application of SAE J1939 communication protocol in electric vehicle

Recently, cooperative control actions of electric vehicle become much more complex than before, it is important and significant to manage and allocate energy by a network in electric vehicle. According to the electric vehicle control requirements, this paper have designed a network architecture based on the vehicle CAN network communication protocol SAE1939, including high-speed network, slow-speed network and charging network, three different CAN network subnet; it have also designed the database of CAN network application layer, message format and time scheduling period, semaphores, etc. a new method for estimating the worst case delay and designed a simulation platform is been proposed to test the situation of CAN bus network under various conditions of the vehicle, and applied the database in the real electric vehicle, the result could meet the requirements.