国产bbaaaaa片,成年美女黄网站色视频免费,成年黄大片,а天堂中文最新一区二区三区,成人精品视频一区二区三区尤物

首頁> 外文會議>IEEE Industry Applications Conference >An Implementation of a Proposed Modification of CAN Protocol on CAN Fieldbus Controller Component for Supporting a Dynamic Priority Policy.
【24h】

An Implementation of a Proposed Modification of CAN Protocol on CAN Fieldbus Controller Component for Supporting a Dynamic Priority Policy.

機譯：關于CAN協(xié)議的建議修改的實現(xiàn)，用于支持動態(tài)優(yōu)先級策略的CAN現(xiàn)場總線控制器組件。

獲取原文
  • 摘要
  • 著錄項
  • 相似文獻
  • 相關主題

摘要

CAN Industrial Local Area Networks, called Controller Area Network, are used in the framework of real-time distributed industrial applications and distributed processing systems. Such applications cover the drinking or used water adduction; the transportation and the distribution of electricity; the purification stations; the oil or gas fields exploitation; the Vehicle and space engines, the automatons and robot systems in manufactures, etc. CAN networks guarantee relatively short time latency. Due to its short frame, when one PDO (Process Data Object) is implemented as a single CAN data frame or CAN remote frame and to its bit-to-bit arbitration. It has been shown that this random access scheme, based on CSMA/CA protocol exceed in performance other likely techniques for wired and Wireless LAN. However, this type of arbitration defines a static priority to messages exchanged. When the offered traffic approaches the system nominal bandwidth, it results a significant growth of transmission periods to a number of stations, that appear in the calculation of the worst-case queuing delay and blocking probabilities in both MAC and Physical sublayers, from there, excluding the CAN to be a realtime network. Suitable techniques for identifiers allocation have been developed to find a satisfactory way to attribute identifiers to exchanged objects, allowing all possible period limits to applications. However, some mission-critical systems (time-critical PDO) will require deterministic behavior in communication during service. Even at maximum load, the transmission of all safety related messages must be guaranteed. To solve this problem, the ideal solution is to determine the point of time when a message with a given priority will be transmitted with a high precision. Some suboptimal solutions have been proposed, like TTCAN (Time Triggered CAN), DiPP (Distributed Priority Policy) and DPP (Dynamic Priority Policy). We have proposed a dynamic priority policy, based on the reserve bits left by the protocol and on the needs expressed in necessary bandwidth, to improving the message transmission periods and to reducing the blocking probability in maximal load. We demonstrate in this paper the easy implementation of the proposed modification of CAN protocol in a CAN controller component and its compatibility with older controllers.
機譯：可以在實時分布式工業(yè)應用和分布式處理系統(tǒng)的框架中使用工業(yè)局域網(wǎng)網(wǎng)絡，稱為控制器區(qū)域網(wǎng)絡。此類應用涵蓋飲用或使用的含水;運輸和電力分配;凈化站;石油或天然氣田剝削;車輛和空間發(fā)動機，制造商中的自動機和機器人系統(tǒng)等?？梢跃W(wǎng)絡可以保證相對短的時間延遲。由于其短幀，當一個PDO（過程數(shù)據(jù)對象）被實現(xiàn)為單個CAN數(shù)據(jù)幀或可以遠程幀以及其位到位仲裁時。已經(jīng)表明，基于CSMA / CA協(xié)議的這種隨機訪問方案超過了有線和無線LAN的其他可能技術。但是，這種類型的仲裁定義了交換消息的靜態(tài)優(yōu)先級。當提供的流量接近系統(tǒng)標稱帶寬時，它會導致傳輸時段的顯著增長到多個站點，這些站點出現(xiàn)在計算MAC和物理子層中的最壞情況排隊延遲和阻塞概率中，從而排除可以是實時網(wǎng)絡。已經(jīng)開發(fā)了合適??的標識符分配技術，以找到令人滿意的方式來歸屬于交換對象的標識符，允許對應用程序的所有可能的時間限制限制。但是，一些關鍵任務系統(tǒng)（時間關鍵的PDO）將需要在服務期間進行通信中的確定性行為。即使在最大負載下，必須保證所有安全相關消息的傳輸。為了解決這個問題，理想的解決方案是以高精度發(fā)送具有給定優(yōu)先級的消息的時間點。已經(jīng)提出了一些次優(yōu)解決方案，如TTCAN（時間觸發(fā)CAN），D??IPP（分布式優(yōu)先級策略）和DPP（動態(tài)優(yōu)先級策略）。我們提出了一種動態(tài)優(yōu)先級，基于協(xié)議留下的儲備位以及在必要的帶寬中表達的需求，以改善消息傳輸期并降低最大負載中的阻塞概率。我們在本文中展示了在CAN控制器組件中可以輕松實現(xiàn)CAN協(xié)議的建議修改及其與舊控制器的兼容性。

著錄項

相似文獻

  • 外文文獻
  • 中文文獻
  • 專利
獲取原文

客服郵箱：kefu@zhangqiaokeyan.com

京公網(wǎng)安備：11010802029741號 ICP備案號：京ICP備15016152號-6 六維聯(lián)合信息科技 (北京) 有限公司?版權所有

  • 客服微信

  • 服務號