Research of FlexRay Dynamic Segment Network Optimization Based on Composite Deadline Message Scheduling Algorithm

FlexRay is a new standard of in-vehicle communication network system,which provides a high speed serial communication, time triggered bus and fault tolerant communication between electronic devices. This paper proposes a network optimization scheme for the composite deadline algorithm for the FlexRay dynamic segment. The priority of the message transmission is allocated by the ratio of the deadline to the message length ratio, which effectively shortens the transmission time and thus improves the network utilization. By analyzing the dynamic segment transmission characteristics and transmission conditions, the most suitable dynamic segment length and minislot number are obtained. By building a network topology architecture model based on CANoe, FlexRay network utilization is up to 31.11% under the condition of many different length messages.