Analysis and Research of Real Time Ability of Message Transmission in CAN Bus

摘要

Through analyzing of the delay composition of message transmission in CAN bus, it discusses the two main parts of information delay in CAN network: the frame delay and media access delay. The frame delay is determined by frame length and baud rate, so we can reach different frame delay under the different frame structure and different baud rate. Through the latitudinal and longitudinal comparison, it analyses the frame delay on the different situations. And the media access delay is mainly caused by the CAN protocol themselves. We can improve the site's priority by dynamic priority algorithm. In this paper, module increase is analyzed. This method can increase the sites priority, so that the real time of CAN network will be improved.