Re-engineering cyber-physical control applications for hybrid communication protocols
Re-engineering cyber-physical control applications for hybrid communication protocols
复制标题
重新设计混合通信协议的网络物理控制应用
DOI：
10.1109/date.2011.5763148
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
S. Chakraborty
中科院分区：
文献类型：
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作者：
Dip Goswami;Reinhard Schneider;S. Chakraborty
在本文中，我们考虑了一个网络物理架构，其中多个控制应用程序被划分为多个任务，在空间上分布在各种处理单元上，这些处理单元通过实现混合通信协议的总线进行通信，即具有时间触发和事件触发通信计划的协议（例如FlexRay）。尽管有效地利用了通信带宽（BW），但事件触发协议存在不可预测的时间行为，这与时间触发协议的情况正好相反。在共享通信总线上交换的控制相关消息所经历的通信延迟的背景下，我们观察到分布式控制应用程序在瞬态阶段比在稳态阶段更容易出现性能下降。我们利用这一观察结果来重新设计控制应用程序，使其在两种模式下运行，以便最佳地利用底层通信介质的双模式（时间和事件触发）特征。根据系统的状态（暂态或稳定），控制输入和通信调度现在都被切换。使用基于flexray的案例研究，我们表明这样的设计在控制性能和总线利用率之间提供了良好的权衡。
In this paper, we consider a cyber-physical architecture where multiple control applications are divided into multiple tasks, spatially distributed over various processing units that communicate over a bus implementing a hybrid communication protocol, i.e., a protocol with both time-triggered and event-triggered communication schedules (e.g., FlexRay). In spite of efficient utilization of communication bandwidth (BW), event-triggered protocols suffer from unpredictable temporal behavior, which is exactly the opposite in the case of their time-triggered counterparts. In the context of communication delays experienced by the control-related messages exchanged over the shared communication bus, we observe that a distributed control application is more prone to performance deterioration in transient phases compared to in the steady-state. We exploit this observation to re-engineer control applications to operate in two modes, in order to optimally exploit the bi-modal (time- and event-triggered) characteristics of the underlying communication medium. Depending on the state (transient or steady) of the system, both, the control inputs and the communication schedule are now switched. Using a FlexRay-based case study, we show that such a design provides a good trade-off between control performance and bus utilization.
DOI：
10.1109/sies.2010.5551383
发表时间：
2010
期刊：
International Symposium on Industrial Embedded System (SIES)
影响因子：
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作者：
Schneider;Goswami;Annaswamy;Chakraborty
通讯作者：
Chakraborty