【摘要】 通过分析CAN总线的非破坏性优先权逐位仲裁的规则,得出若采用建立在确定性系统模型基础上的静态优先级,当总线带宽利用率很高时,低优先级信息帧发送时延会大大增加,甚至造成数据的丢失,同时采用静态优先级在系统运行过程中不能对调度分配进行修正。因此提出单队单拍(SQSA)和单队多拍(SQMA)的动态优先级晋升方法及数学模型,分析该模型的吞吐率,模型的最大延时及采用SQMA可能出现的问题及解决方法。通过仿真实验验证提出的改进动态优先级的方法在网络吞吐率、平均时延和网络利用率都有较好的性能。更多还原

【Abstract】 Currently the article analyzes the CAN bus’s rule of priority’s arbitration bit by bit without destroy.It elicits the conclusion that if static priority based on the affirmatory system model is used,the lower priority’s messages will be much more delayed,even lose some data when the bus’s bandwidth is widely used and scheduling can’t be modified during the system.The dynamic priority promoting method and math model of SQSA and SQMA is achieved in the article,it analyses the model’s rate of taking in and sending out in large quantities,the largest delay,the problems and solutions when using SQMA.In the end,It is validated that the method of improving dynamic in the article has good performances on the network rate of taking in and sending out in large quantities,the average delay and the rate of network usage by emulational experiments.更多还原