带时间触发的CAN网络设计

Design of Time Triggered CAN Network

为解决CAN总线系统中事件触发报文发送时,固定优先级仲裁机制所引起的发送时间不确定,低优先级报文可能被延误的问题,根据时间触发CAN的基本原理和结构特征,结合通用CAN控制器SJA1000,举例介绍如何组建一个TTCAN实验系统的基本步骤和算法。该设计可以确保实时和安全性要求较高的自控系统的正常运行。

With the intention of solving a problem that a message with low priority may be delayed over in CAN system sometimes, its cause is the principle for event triggering communication with fixed arbitration priority of message on CAN bus. It is introduced by an example that how to design a Time Triggered CAN（TTCAN） basic system and an arithmetic, according to TTCAN principium. Such design can ensure normal operation in autocontrol systems which demands more instant ability and higher security, but it sacrifices the flexibility during configurating or altering a CAN system.