The intermittent connection（IC）of the field-bus in networked manufacturing systems is a common but hard troubleshooting network problem,which may result in system level failures or safety issues.However,there is no ...The intermittent connection（IC）of the field-bus in networked manufacturing systems is a common but hard troubleshooting network problem,which may result in system level failures or safety issues.However,there is no online IC location identification method available to detect and locate the position of the problem.To tackle this problem,a novel model based online fault location identification method for localized IC problem is proposed.First,the error event patterns are identified and classified according to different node sources in each error frame.Then generalized zero inflated Poisson process（GZIP）model for each node is established by using time stamped error event sequence.Finally,the location of the IC fault is determined by testing whether the parameters of the fitted stochastic model is statistically significant or not using the confident intervals of the estimated parameters.To illustrate the proposed method,case studies are conducted on a 3-node controller area network（CAN）test-bed,in which IC induced faults are imposed on a network drop cable using computer controlled on-off switches.The experimental results show the parameters of the GZIP model for the problematic node are statistically significant（larger than 0）,and the patterns of the confident intervals of the estimated parameters are directly linked to the problematic node,which agrees with the experimental setup.The proposed online IC location identification method can successfully identify the location of the drop cable on which IC faults occurs on the CAN network.展开更多
An autonomous vehicle operates in a dynamically changing environment,where multiple sensors must work in a cooperative mode. In these scenarios reliability of the communication protocol carries a lot of importance in ...An autonomous vehicle operates in a dynamically changing environment,where multiple sensors must work in a cooperative mode. In these scenarios reliability of the communication protocol carries a lot of importance in real time data transfer. In this paper, CAN communication is used to demonstrate sensor integration using a LIDAR and a camera. Also demonstrated is a novel method for object detection, obstacle avoidance and navigation of an autonomous RC vehicle.展开更多
This paper reviews the research work done on the Reliability Analysis of Controller Area Network (CAN) based systems. During the last couple of decades, real-time researchers have extended schedulability analysis to a...This paper reviews the research work done on the Reliability Analysis of Controller Area Network (CAN) based systems. During the last couple of decades, real-time researchers have extended schedulability analysis to a mature technique which for nontrivial systems can be used to determine whether a set of tasks executing on a single CPU or in a distributed system will meet their deadlines or not [1-3]. The main focus of the real-time research community is on hard real-time systems, and the essence of analyzing such systems is to investigate if deadlines are met in a worst case scenario. Whether this worst case actually will occur during execution, or if it is likely to occur, is not normally considered. Reliability modeling, on the other hand, involves study of fault models, characterization of distribution functions of faults and development of methods and tools for composing these distributions and models in estimating an overall reliability figure for the system [4]. This paper presents the research work done on reliability analysis developed with a focus on Controller-Area-Network-based automotive systems.展开更多
在机械电源管理领域,高效的监控和控制系统是提升能效与保证设备可靠性的关键。文章详细探讨了基于控制器局域网络(Controller Area Network,CAN)总线技术的机械电源管理系统优化方法,包括数据传输与处理的高效化、智能控制算法的集成...在机械电源管理领域,高效的监控和控制系统是提升能效与保证设备可靠性的关键。文章详细探讨了基于控制器局域网络(Controller Area Network,CAN)总线技术的机械电源管理系统优化方法,包括数据传输与处理的高效化、智能控制算法的集成、故障预测与响应机制的优化以及系统可靠性与安全性的强化。通过这些策略,展示了如何通过CAN总线技术显著提高机械电源管理系统的性能和可靠性,同时详细描述了系统测试,证实了所提方法的有效性和实用性。展开更多
针对电力变电站运行设备远程运维过程中信息传输滞后与检修效率低等问题,提出一种基于控制器局域网(Controller Area Network,CAN)通信的远程运维管理系统。通过构建分层通信架构、优化报文结构与节点交互机制,实现对变电站运行状态的...针对电力变电站运行设备远程运维过程中信息传输滞后与检修效率低等问题,提出一种基于控制器局域网(Controller Area Network,CAN)通信的远程运维管理系统。通过构建分层通信架构、优化报文结构与节点交互机制,实现对变电站运行状态的高效采集与运维决策支持。测试结果表明,所设计系统可在多节点并行接入场景下维持低时延与高可靠性,为变电站智能化运维提供技术支撑。展开更多
现场总线控制系统作为新一代控制系统在电力系统尤其是在配电网自动化和变电站自动化中得到了广泛的应用。文中介绍了现场总线中一种很有影响的控制局域网络(Control Area Network, CAN)总线技术,同时介绍了嵌入式计算机的工业标准PC/10...现场总线控制系统作为新一代控制系统在电力系统尤其是在配电网自动化和变电站自动化中得到了广泛的应用。文中介绍了现场总线中一种很有影响的控制局域网络(Control Area Network, CAN)总线技术,同时介绍了嵌入式计算机的工业标准PC/104总线,设计出可用于变电站监控的基于CAN总线的嵌入式控制系统,并已在动态模拟实验室中投入运行,取得了满意效果。展开更多
基金Supported by National Natural Science Foundation of China(Grant No51005205)Science Fund for Creative Research Groups of Nationa Natural Science Foundation of China(Grant No.51221004)+1 种基金Nationa Basic Research Program of China(973 Program,Grant No.2013CB035405)Open Foundation of State Key Laboratory of Automotive Safety and Energy,Tsinghua University,China(Grant No.KF13011)
文摘The intermittent connection（IC）of the field-bus in networked manufacturing systems is a common but hard troubleshooting network problem,which may result in system level failures or safety issues.However,there is no online IC location identification method available to detect and locate the position of the problem.To tackle this problem,a novel model based online fault location identification method for localized IC problem is proposed.First,the error event patterns are identified and classified according to different node sources in each error frame.Then generalized zero inflated Poisson process（GZIP）model for each node is established by using time stamped error event sequence.Finally,the location of the IC fault is determined by testing whether the parameters of the fitted stochastic model is statistically significant or not using the confident intervals of the estimated parameters.To illustrate the proposed method,case studies are conducted on a 3-node controller area network（CAN）test-bed,in which IC induced faults are imposed on a network drop cable using computer controlled on-off switches.The experimental results show the parameters of the GZIP model for the problematic node are statistically significant（larger than 0）,and the patterns of the confident intervals of the estimated parameters are directly linked to the problematic node,which agrees with the experimental setup.The proposed online IC location identification method can successfully identify the location of the drop cable on which IC faults occurs on the CAN network.
文摘An autonomous vehicle operates in a dynamically changing environment,where multiple sensors must work in a cooperative mode. In these scenarios reliability of the communication protocol carries a lot of importance in real time data transfer. In this paper, CAN communication is used to demonstrate sensor integration using a LIDAR and a camera. Also demonstrated is a novel method for object detection, obstacle avoidance and navigation of an autonomous RC vehicle.
文摘This paper reviews the research work done on the Reliability Analysis of Controller Area Network (CAN) based systems. During the last couple of decades, real-time researchers have extended schedulability analysis to a mature technique which for nontrivial systems can be used to determine whether a set of tasks executing on a single CPU or in a distributed system will meet their deadlines or not [1-3]. The main focus of the real-time research community is on hard real-time systems, and the essence of analyzing such systems is to investigate if deadlines are met in a worst case scenario. Whether this worst case actually will occur during execution, or if it is likely to occur, is not normally considered. Reliability modeling, on the other hand, involves study of fault models, characterization of distribution functions of faults and development of methods and tools for composing these distributions and models in estimating an overall reliability figure for the system [4]. This paper presents the research work done on reliability analysis developed with a focus on Controller-Area-Network-based automotive systems.
文摘在机械电源管理领域,高效的监控和控制系统是提升能效与保证设备可靠性的关键。文章详细探讨了基于控制器局域网络(Controller Area Network,CAN)总线技术的机械电源管理系统优化方法,包括数据传输与处理的高效化、智能控制算法的集成、故障预测与响应机制的优化以及系统可靠性与安全性的强化。通过这些策略,展示了如何通过CAN总线技术显著提高机械电源管理系统的性能和可靠性,同时详细描述了系统测试,证实了所提方法的有效性和实用性。
文摘针对电力变电站运行设备远程运维过程中信息传输滞后与检修效率低等问题,提出一种基于控制器局域网(Controller Area Network,CAN)通信的远程运维管理系统。通过构建分层通信架构、优化报文结构与节点交互机制,实现对变电站运行状态的高效采集与运维决策支持。测试结果表明,所设计系统可在多节点并行接入场景下维持低时延与高可靠性,为变电站智能化运维提供技术支撑。
文摘现场总线控制系统作为新一代控制系统在电力系统尤其是在配电网自动化和变电站自动化中得到了广泛的应用。文中介绍了现场总线中一种很有影响的控制局域网络(Control Area Network, CAN)总线技术,同时介绍了嵌入式计算机的工业标准PC/104总线,设计出可用于变电站监控的基于CAN总线的嵌入式控制系统,并已在动态模拟实验室中投入运行,取得了满意效果。
