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Efficient controller area network data compression for automobile applications

Yu-jing WU,Jin-Gyun CHUNG

《信息与电子工程前沿（英文）》 2015年第16卷第1期页码 70-78 doi: 10.1631/FITEE.1400136

摘要： Controller area networks (CANs) have been designed for multiplexing communication between electronic control units (ECUs) in vehicles and many high-level industrial control applications. When a CAN bus is overloaded by a large number of ECUs connected to it, both the waiting time and the error probability of the data transmission are increased. Thus, it is desirable to reduce the CAN frame length, since the duration of data transmission is proportional to the frame length. In this paper, we present a CAN message compression method to reduce the CAN frame length. Experimental results indicate that CAN transmission data can be compressed by up to 81.06% with the proposed method. By using an embedded test board, we show that 64-bit engine management system (EMS) CAN data compression can be performed within 0.16 ms; consequently, the proposed algorithm can be successfully used in automobile applications.

关键词： Controller area network (CAN) Electronic control units (ECUs) Data compression Signal rearrangement

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基于可观测节点信息的控制器局域网节点可靠性评估 Article

Lei-ming ZHANG, Long-hao TANG, Yong LEI

《信息与电子工程前沿（英文）》 2017年第18卷第5期页码 615-626 doi: 10.1631/FITEE.1601029

摘要：基于控制器局域网的总线技术广泛应用于网络化制造系统。网络作为系统的信息通道，其可靠性对系统的吞吐量、产品质量以及工作人员的安全至关重要。然而，由于节点内部状态的不可访问性，因此使用节点内置的错误计数器值直接评估控制器局域网节点的可靠性是难以进行的。本文提出一种新颖的控制器局域网节点可靠性评估方法，该方法使用节点脱离总线时间作为可靠性测度。基于网络错误日志和错误计数器值可访问的可观测节点信息，该方法可以估计网络中节点的发送错误计数器值。首先，本文基于分段马尔科夫链建立了估计节点发送错误计数器值的模型，该模型考虑了网络中错误分布的稀疏特性。其次，通过学习可观测节点的模型估计值和实际测量值之间的偏差，建立了贝叶斯网络以表述可观测节点的模型估计值更新机制。然后，将该更新机制应用到网络中发送错误计数器值不可访问的节点，完成其模型估计值的更新。最后，建立了节点可靠性评估方法以预测节点的脱离总线时间。为表明文中方法的有效性，进行了多组实验。实验结果表明由文中方法得到的估计值与实际观测值相一致。

关键词：控制器局域网；发送错误计数器；发送错误计数器值估计；贝叶斯网络；脱离总线时间

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控制器局域网在错误状态下的报文延时分布研究 Research Papers

Lei-ming ZHANG, Yi-chao SUN, Yong LEI

《信息与电子工程前沿（英文）》 2019年第20卷第6期页码 760-772 doi: 10.1631/FITEE.1700815

摘要：控制器局域网（CAN）是一种广泛应用于各类工业场景的现场总线协议。为深入理解错误发生时的网络行为并优化网络控制系统设计，需分析CAN网络报文响应时间。本文在考虑错误的基础上，提出一种新颖的CAN网络报文延时分布分析方法，将复杂报文序列分解为典型报文模式和情形。

关键词：控制器局域网；报文延时；概率分布；错误

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Distributed monitoring and diagnosis system for hydraulic system of construction machinery

Xiaohu CHEN, Wenfeng WU, Hangong WANG, Yongtao ZHOU,

《机械工程前沿（英文）》 2010年第5卷第1期页码 106-110 doi: 10.1007/s11465-009-0089-7

摘要： This paper mainly presents a distributed monitoring and diagnosis system for the hydraulic system of construction machinery based on the controller area net (CAN) field bus. The hardware of the distributed condition monitoring and fault diagnosis system is designed. Its structure including the sensors, distributed data acquisition units, central signal processing unit, and CAN field bus is introduced. The software is also programmed. The general software design and its realization are studied in detail. The experiments and applications indicate that the distributed condition monitoring and fault diagnosis system can effectively realize its function of real-time online condition monitoring and fault diagnosis for the hydraulic system of construction machinery.

关键词： construction machinery hydraulic system distributed condition monitoring controller area net (CAN) field bus fault diagnosis

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混合动力挖掘机电动回转系统通信错误状态下的分布式容错策略 Article

Da-hui GAO, Qing-feng WANG, Yong LEI

《信息与电子工程前沿（英文）》 2017年第18卷第7期页码 941-954 doi: 10.1631/FITEE.1601021

摘要：基于自适应的延时与丢帧补偿，提出了一种分布式容错策略，用以确保基于CAN （controller area network）总线的混合动力挖掘机电动回转系统在通信出错时获得良好的运行性能。

关键词：容错；延时补偿；CAN总线；通信错误；混合动力挖掘机电动回转系统

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CAN总线时间触发机制的实现

吕伟杰,,刘鲁源,王毅新

《中国工程科学》 2005年第7卷第9期页码 40-43

摘要：

分析了CAN总线的时间触发机制，基于8052单片机和CAN控制器SJA1000设计了时间触发机制的实现方案，给出了网络中基本周期中可传输的最大消息数目及可调度分析方法。以汽车引擎控制系统为例进行的实验结果表明，利用CAN总线时间触发机制不仅可以有效地管理消息的传输，而且提高了总线带宽利用率。

关键词：时间触发时间同步 CAN总线分布式控制系统

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Impact of wind power generating system integration on frequency stabilization in multi-area power systemwith fuzzy logic controller in deregulated environment

Y. K. BHATESHVAR,H. D. MATHUR,H. SIGUERDIDJANE

《能源前沿（英文）》 2015年第9卷第1期页码 7-21 doi: 10.1007/s11708-014-0338-2

摘要： Among the available options for renewable energy integration in existing power system, wind power is being considered as one of the suited options for future electrical power generation. The major constraint of wind power generating system (WPGS) is that it does not provide inertial support because of power electronic converters between the grid and the WPGS to facilitate frequency stabilization. The proposed control strategy suggests a substantial contribution to system inertia in terms of short-term active power support in a two area restructured power system. The control scheme uses fuzzy logic based design and takes frequency deviation as input to provide quick active power support, which balances the drop in frequency and tie-line power during transient conditions. This paper presents a comprehensive study of the wind power impact with increasing wind power penetration on frequency stabilization in restructured power system scenario. Variation of load conditions are also analyzed in simulation studies for the same power system model with the proposed control scheme. Simulation results advocates the justification of control scheme over other schemes.

关键词： two area power system automatic generation control wind power generating system (WPGS) deregulated environment fuzzy logic controller (FLC)

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DITCHES AND PONDS CAN BE THE SOURCES OR SINKS OF NON-POINT SOURCE POLLUTION: OBSERVATIONS IN AN UPLANDAREA IN THE JINGLINXI CATCHMENT, CHINA

《农业科学与工程前沿（英文）》 2023年第10卷第4期页码 607-626 doi: 10.15302/J-FASE-2023517

摘要：

As the common features of agroecosystems, ditches and ponds benefit the irrigation and drainage, as well as intercepting non-point source pollutants. However, most ditch-pond studies have been conducted in lowland areas. To test this source-sink assumption in upland areas, this study made observations on the ecological function of the ditch and pond system in a typical catchment in China. First, the changes in ponds in the catchment were analyzed using high-resolution remote sensing data. Then, the migration of agricultural pollutants in ditches and ponds were analyzed by field sampling and laboratory detection. The results showed that over the past 15 years the length of ditches in the catchment and the number of small ponds (< 500 m²) have increased by 32% and 75%, respectively. The rate of change in nutrient concentrations in the ditches and ponds were mostly from −20% to 20%, indicating ditches and ponds can be both sources and sinks for agricultural pollutants. Lastly, the contributing factors were explored and it was found that ditches and ponds are important sinks in dry season. However, during the rainy season, ditches and ponds become sources of pollutants, with the rapid drainage of ditches and the overflow of ponds in upland areas. The results of this study revealed that the ditches and ponds could be used for ecological engineering in upland catchments to balance drainage and intercept pollutants.

关键词： ditches ponds non-point source pollution mountainous areas nitrogen phosphorus

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智能阀门定位系统的设计

吴爱国,王立石

《中国工程科学》 2005年第7卷第4期页码 69-73

摘要：其中应用Philips公司的带CAN总线接口的ARM控制器作为系统的控制核心，既满足了现场实时数据的采集、计算和处理，又可以通过CAN总线使得阀门控制器和控制中心保持实时通信；控制策略采用带智能积分的自学习模糊控制算法

关键词： ARM 控制器 CAN总线智能积分自学习模糊控制

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Can floor-area-ratio incentive promote low impact development in a highly urbanized area?

Ming Cheng, Huapeng Qin, Kangmao He, Hongliang Xu

《环境科学与工程前沿（英文）》 2018年第12卷第2期 doi: 10.1007/s11783-017-1002-y

摘要： As an environmental friendly measure for surface runoff reduction, low impact development (LID) has been applied successfully in urban areas. However, due to high price of land and additional expense for LID construction in highly urbanized areas, the developers of real estate would not like to proceed LID exploitation. Floor area ratio (FAR) refers to “the ratio of a building’s total floor area to the size of the piece of land upon which it is built.” Increasing FAR indicates that the developers can construct higher buildings and earn more money. By means of awarding FAR, the developers may be willing to practice LID construction. In this study, a new residential district is selected as a case study to analyze the trade-off between the runoff reduction goal achieving by LID practices and the incentive of awarding FAR to promote LID construction. The System for Urban Stormwater Treatment and Analysis IntegratioN (SUSTAIN) model is applied to simulate the runoff reduction under various LID designs and then derive the Pareto-optimal solutions to achieve urban runoff reduction goals based on cost efficiency. The results indicates that the maximum surface runoff reduction is 20.5%. Under the extremity scenarios, the government has options to award FAR of 0.028, 0.038 and 0.047 and the net benefits developers gain are 0 CNY, one million CNY and two million CNY, respectively. The results provide a LID construction guideline related to awarding FAR, which supports incentive policy making for promoting LID practices in the highly urbanized areas.

关键词： Low impact development Runoff reduction Incentive Floor area ratio SUSTAIN(System for Urban Stormwater Treatment and Analysis IntegratioN)

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EAP-FAST在公共无线局域网安全接入控制中的研究及实现

曹萍,裴文江

《中国工程科学》 2005年第7卷第12期页码 78-82

摘要：

Cisco公司于2004年提出基于隧道的灵活认证协议（EAP-FAST）以替代存在安全漏洞的LEAP认证协议，该协议具有安全性和易部署性的特点。文章论述了基于802.1x协议的EAP-FAST认证协议及其实现技术，并在公共无线局域网(PWLAN)综合实验平台上实现了EAP-FAST认证的客户端、认证者、认证服务器端功能。

关键词：公共无线局域网端口访问控制协议（802.1x）基于隧道的灵活认证协议（EAP-FAST）

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Performance investigation of artificial intelligence based controller for three phase four leg shunt

J. JAYACHANDRAN,R. MURALI SACHITHANANDAM

《能源前沿（英文）》 2015年第9卷第4期页码 446-460 doi: 10.1007/s11708-015-0378-2

摘要： In this paper, the choice of power quality compensator is a DSTATCOM which constitutes a three phase four leg voltage source converter (VSC) with a DC capacitor. The control strategy proposed for the DSTATCOM is a neural network based one cycle control (OCC). This control strategy involves neural network block, digital circuits and linear elements, which eliminates the sensors required for sensing the load current and coupling inductor current in addition to the multiplier employed in the conventional method. The calculation of harmonic and reactive currents for the reference current generation is also eliminated, thus minimizing the complexity in the control strategy. The control strategy mitigates harmonic/reactive currents, ensures balanced and sinusoidal source current from the supply mains that are nearly in phase with the supply voltage, compensates neutral current, and maintains voltage across the capacitor under unbalanced source and load conditions. The performance of the DSTATCOM with the proposed artificial neural network (ANN) controllers is validated and investigated through simulations using Matlab software. The simulation results prove the efficacy of the proposed neural network based control strategy under varying source and load conditions.

关键词： neural network DSTATCOM neutral current mitigation total harmonic distortion (THD) three phase four wire distribution system unbalanced and/or distorted source

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Simulation model based on Monte Carlo method for traffic assignment in local area road network

Yuchuan DU, Yuanjing GENG, Lijun SUN

《结构与土木工程前沿（英文）》 2009年第3卷第2期页码 195-203 doi: 10.1007/s11709-009-0032-3

摘要： For a local area road network, the available traffic data of traveling are the flow volumes in the key intersections, not the complete OD matrix. Considering the circumstance characteristic and the data availability of a local area road network, a new model for traffic assignment based on Monte Carlo simulation of intersection turning movement is provided in this paper. For good stability in temporal sequence, turning ratio is adopted as the important parameter of this model. The formulation for local area road network assignment problems is proposed on the assumption of random turning behavior. The traffic assignment model based on the Monte Carlo method has been used in traffic analysis for an actual urban road network. The results comparing surveying traffic flow data and determining flow data by the previous model verify the applicability and validity of the proposed methodology.

关键词： traffic assignment local area road network turning ratio Monte Carlo method

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基于神经网络与遗传算法耦合的煤与瓦斯突出区域预测研究

施式亮,伍爱友

《中国工程科学》 2009年第11卷第9期页码 91-96

摘要：

煤与瓦斯突出是煤矿地下开采过程中的一种动力现象，剧烈的动力效应可导致矿井重大的财产损失和人员伤亡，因此，实现煤与瓦斯突出的有效预测对煤炭工业安全生产具有重要意义。文章以煤与瓦斯突出的自然条件及地质构造特征为基础，针对神经网络易陷入局部极小而引起预测指标权值分布不合理的缺陷，提出了基于神经网络和遗传算法耦合的煤与瓦斯突出区域预测模型，并进行了实例验证。研究结果证明了该模型的合理性，对煤矿实现煤与瓦斯突出区域的预测具有较大的指导价值。

关键词：煤与瓦斯突出区域预测神经网络遗传算法突出等值线

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基于自适应网络模糊推理系统的移动机器人导航控制器 Research Article

Panati SUBBASH, Kil To CHONG

《信息与电子工程前沿（英文）》 2019年第20卷第2期页码 141-151 doi: 10.1631/FITEE.1700206

摘要：在障碍物高度杂乱的未知环境中自主导航是移动机器人研究的一个基本问题。提出一种基于自适应网络模糊推理系统（ANFIS）的差分驱动移动机器人导航控制器，用超声波传感器捕捉移动机器人周围的环境信息。设计了一个基于模糊逻辑的导航控制器，用于获取数据集训练ANFIS控制器。在移动机器人导航过程中，考虑到环境噪声对传感器读数的影响，将加性高斯白噪声添加到传感器读数中并反馈给已训练的ANFIS控制器。在3种不同环境下对移动机器人进行导航，评价该导航控制器的鲁棒性。通过与已有移动机器人导航控制器（如神经网络、模糊逻辑）比较行程长度、行程效率、弯曲能量，验证ANFIS控制器性能。仿真结果表明，与其他控制器相比，ANFIS控制器具有更好性能，能够在不同环境中顺利导航且不与障碍物发生碰撞。

关键词：自适应网络模糊推理系统；加性高斯白噪声；自主导航；移动机器人

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标题作者时间类型操作

Efficient controller area network data compression for automobile applications

Yu-jing WU,Jin-Gyun CHUNG

期刊论文

基于可观测节点信息的控制器局域网节点可靠性评估

Lei-ming ZHANG, Long-hao TANG, Yong LEI

期刊论文

控制器局域网在错误状态下的报文延时分布研究

Lei-ming ZHANG, Yi-chao SUN, Yong LEI

期刊论文

Distributed monitoring and diagnosis system for hydraulic system of construction machinery

Xiaohu CHEN, Wenfeng WU, Hangong WANG, Yongtao ZHOU,

期刊论文

混合动力挖掘机电动回转系统通信错误状态下的分布式容错策略

Da-hui GAO, Qing-feng WANG, Yong LEI

期刊论文

CAN总线时间触发机制的实现

吕伟杰,,刘鲁源,王毅新

期刊论文

Impact of wind power generating system integration on frequency stabilization in multi-area power systemwith fuzzy logic controller in deregulated environment

Y. K. BHATESHVAR,H. D. MATHUR,H. SIGUERDIDJANE

期刊论文

DITCHES AND PONDS CAN BE THE SOURCES OR SINKS OF NON-POINT SOURCE POLLUTION: OBSERVATIONS IN AN UPLANDAREA IN THE JINGLINXI CATCHMENT, CHINA

期刊论文

智能阀门定位系统的设计

吴爱国,王立石

期刊论文

Can floor-area-ratio incentive promote low impact development in a highly urbanized area?

Ming Cheng, Huapeng Qin, Kangmao He, Hongliang Xu

期刊论文

EAP-FAST在公共无线局域网安全接入控制中的研究及实现

曹萍,裴文江