基于DMS和EDF的CAN總線(xiàn)混合調度算法

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基于DMS和EDF的CAN總線(xiàn)混合調度算法
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作者單位:(湖北工業(yè)大學(xué) 機械工程學(xué)院, 武漢 430068)
作者簡(jiǎn)介:許 萬(wàn)(1979-),男,湖北武漢人,工學(xué)博士,副教授,主要從事網(wǎng)絡(luò )化控制系統、運動(dòng)控制等方向的研究。 [FQ)]
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中圖分類(lèi)號:TP3
基金項目:國家自然科學(xué)基金(51174084);武漢市科技青年晨光計劃(201271031386)。

CAN Bus Hybrid Scheduling Algorithm Based on DMS and EDF

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(School of Mechanical Engineering, Hubei University of Technology, Wuhang 430068, China)

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摘要:

針對CAN總線(xiàn)調度問(wèn)題,分析了CAN網(wǎng)絡(luò )中信息幀發(fā)生傳輸錯誤的概率化最大響應時(shí)間,融合DMS算法的可預測性良好、處理器開(kāi)銷(xiāo)低以及對數分區EDF算法的靈活性強、網(wǎng)絡(luò )利用率高的特點(diǎn),提出一種考慮消息關(guān)鍵性的混合調度算法；在上述研究基礎上,利用MATLAB/SimEvents工具箱建立CAN網(wǎng)絡(luò )模型,并對3種調度算法進(jìn)行了仿真,當網(wǎng)絡(luò )利用率達到約85%時(shí),混合調度算法丟包率為0.8%,但丟失的數據不包含硬實(shí)時(shí)消息,而且成功降低了處理器的額外開(kāi)銷(xiāo)時(shí)間,仿真結果表明混合調度算法既能提高系統的實(shí)時(shí)性,又能減小處理器的運算負擔。

Abstract:

In this paper we provide a probabilistic analysis of worst case response time of message with faults in the Controller Aera network (CAN). By studying and analyzing static scheduling algorithm Deadline Monotonous Scheduling(DMS) and dynamic scheduling algorithm Earliest Deadline First(EDF) in the CAN, and combining the good predictability and cheap processor cost of DMS algorithm with the strong flexibility and high utilization of logarithm partition EDF algorithm, this paper presented a hybrid scheduling algorithm with considering critical level of messages. Based on the work mentioned above, the simulation platform of CANbus is developed with MATLAB/SimEvents tool box, The platform was used to real-time analysis for the scheduling algorithms mentioned before, the simulation results showed that the hybrid scheduling algorithm could not only improve the real-time performance of system, but also could reduce the cost of processor.

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許萬(wàn),楊光友,唐宗美.基于DMS和EDF的CAN總線(xiàn)混合調度算法計算機測量與控制[J].,2014,22(5):1502-1505.

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收稿日期:2013-12-26
最后修改日期:2014-02-24
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在線(xiàn)發(fā)布日期: 2014-12-16
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