时间触发CAN总线系统的建模与性能分析

时间触发机制的引入提高了CAN总线对实时周期性消息的处理能力,然而系统中的非周期性消息具有迸发性、不可预知性和类型复杂的特点,对其传输性能的分析较为困难。该文利用确定随机Petri网理论建立了时间触发CAN总线系统的模型,通过仿真对异步相中非周期性消息传输进行吞吐量和平均延时等性能分析,得出了相应的量化规律,其结论对时间触发CAN总线系统的分析与设计具有指导意义。

Modeling and Performance Evaluation of Time-Triggered CAN Bus

Time-triggered mechanisms improve the ability of Controller Area Network (CAN) bus to deal with the time-critical periodic messages. However, the non-periodic messages have the burst and unpredictable characteristics with complex types. Therefore, it's difficult to analyze their transfer performance. To resolve this problem, a multi-nodes model of time-triggered CAN system is proposed, which is based on deterministic and stochastic Petri net. Through the simulation of the non-periodic messages in asynchronous part, relative performances including the throughput, the average packet delay and the quantitative laws are obtained. These performance are very useful to the analysis and design of the time-triggered CAN systems.