This paper proposes a rail pressure tracking controller based on a novel common rail system. A mathematical model, based on physical equations, is developed and used for feed forward control design. Rail pressure peak...This paper proposes a rail pressure tracking controller based on a novel common rail system. A mathematical model, based on physical equations, is developed and used for feed forward control design. Rail pressure peak sampling mechanism is designed to remove the disturbance of rail pressure due to fuel injection. All enhanced tracking differentiator is designed to get smooth tracking signal and exact differential signal from signal with noise. Double loop control strategy is designed to decouple the system and to improve dynamic performance of the system. Experimental results indicate that fluctuation of rail pressure is within il MPa in steady condition, while within ±3 MPa in transient condition, which verifies the effectiveness of the proposed rail pressure control strategy.展开更多
A frequency compensation control method for the opposed-piston two-stroke folded-cranktrain( OPFC) diesel engine's common rail system is presented as a result of the study of the loop-shaping theory. A common rail ...A frequency compensation control method for the opposed-piston two-stroke folded-cranktrain( OPFC) diesel engine's common rail system is presented as a result of the study of the loop-shaping theory. A common rail working process and the classical frequency control theory are combined to construct a frequency restriction of common rail pressure. A frequency compensator is utilized to improve the robustness of multiplicative perturbations and disturbance. The loop-shaping method has been applied to design the common rail pressure controller of the OPFC diesel engine. Simulation and bench test results show that in the condition of perturbation that comes from the effect of injection,multi-injection,fuel pumping of a pre-cylinder,and instantaneous pressure fluctuation,the controller indicates high precision. Compared with the original controller,this method improves the control precision by 67. 3%.展开更多
A direct injection low compression ratios diesel rotary engine is designed and studied to find the appropriate application of the electronic controlled high pressure common rail injection system. Current development f...A direct injection low compression ratios diesel rotary engine is designed and studied to find the appropriate application of the electronic controlled high pressure common rail injection system. Current development focuses on the applied fuel injection and ignition strategies, especially concerning the combustion configurations of injectors, ignition source, and combustion chamber. The prototype engine, equipped with Bosch common rail system and high performance electronic control unit (ECU), is designed correspondingly. Studies show that the integration of a common rail injection system and the main and pilot duel injectors configurations, assisted with glow plug ignition device and flexible ECU, represents a promising approach to improve the potential of the low compression ratios diesel rotary engine. Currently the engine can run at 6 kr · min^-1 steadily and the power is about 68 kW/(4 kr ·min^- 1).展开更多
The Beijing-Zhangjiakou high-speed railway starts from Beijingbei railway station and ends at Zhangjiakou station, Zhangjiakou city. Changping workshop of high-speed railway of Beijing track maintenance division has t...The Beijing-Zhangjiakou high-speed railway starts from Beijingbei railway station and ends at Zhangjiakou station, Zhangjiakou city. Changping workshop of high-speed railway of Beijing track maintenance division has the jurisdiction of about 122.3km (including Yanqing railway). According to the site situation, this paper summarizes and analyzes the problems in the use of the track control network (CPIII) in this section, and puts forward some improvement suggestions based on the experience, hoping to provide some enlightenment for the design of the high-speed railway precision measurement network in the future.展开更多
控制指令是保障列车安全、可靠、有序运行的关键要素,其安全传输对列控系统的功能安全至关重要。然而,当前列控系统广泛采用的三重数据加密标准(Triple Data Encryption Standard,3DES)算法、离线密钥分发等安全机制较为薄弱,难以应对...控制指令是保障列车安全、可靠、有序运行的关键要素,其安全传输对列控系统的功能安全至关重要。然而,当前列控系统广泛采用的三重数据加密标准(Triple Data Encryption Standard,3DES)算法、离线密钥分发等安全机制较为薄弱,难以应对日益复杂的网络攻击。特别是量子计算的快速发展对经典密码算法的安全性构成根本性威胁,使得控制指令传输面临长期安全风险。为此,系统性地分析既有列控系统的安全机制,识别其在数据安全方面存在的核心风险与需求。在此基础上,结合量子密钥分发(Quantum Key Distribution,QKD)技术的“信息论安全”优势与后量子密码(Post-Quantum Cryptography,PQC)算法的计算安全性,提出一种面向列控系统的新型密码架构。该架构从双向身份认证、在线密钥分发与管理、数据安全传输3个维度,构建了集抗量子攻击与高可用性于一体的安全增强方案,旨在有效提升列控系统的主动防御能力,为应对未来量子计算威胁、保障列控系统数据安全提供前瞻性解决方案。展开更多
在实现“双碳”目标的背景下,城市轨道交通需要实现节能低碳运行。现有牵引供电系统(traction power supply system,TPSS)采用下垂控制策略存在再生制动能量利用率低、缺乏对系统潮流主动有效控制及优化手段等问题。该文分析双向变流器...在实现“双碳”目标的背景下,城市轨道交通需要实现节能低碳运行。现有牵引供电系统(traction power supply system,TPSS)采用下垂控制策略存在再生制动能量利用率低、缺乏对系统潮流主动有效控制及优化手段等问题。该文分析双向变流器的下垂参数对系统用电量的影响,进而提出一种实现牵引负荷功率最优分配的协同控制方法,该方法对双向变流器的下垂参数实时优化和调整,促进机车再生制动能量的流动,有效提高再生制动能量利用率,显著提升系统协同控制性能。经仿真计算,采用该方法可年节约0.17亿k W·h电量,有效助力城市轨道交通牵引供电系统安全、经济运行。展开更多
为提升轨道物流系统的智能化与调度效率,提出了一种融合数字孪生技术与强化学习算法的轨道物流路径规划系统。首先,设计了一套层级分明、区域划分合理的控制系统架构,通过“分区域分层级”的混合控制网络,实现对物流机器人与轨道设施的...为提升轨道物流系统的智能化与调度效率,提出了一种融合数字孪生技术与强化学习算法的轨道物流路径规划系统。首先,设计了一套层级分明、区域划分合理的控制系统架构,通过“分区域分层级”的混合控制网络,实现对物流机器人与轨道设施的高效协同管理。其次,构建符合ISO23247标准的“四层五空间”数字孪生系统架构,确保物理系统与虚拟孪生体的高实时性与高一致性。针对多机器人路径冲突与路径规划效率问题,提出改进的双重深度Q网络算法(improved double deep Q-network,ID3QN),引入三维奖励机制(安全性、通行效率与时效性)与动作剪枝策略,有效提升路径规划的收敛性与稳定性。实验结果表明,该系统在复杂动态环境中展现出良好的调度性能,机器人平均路径时间缩短9.1%,冲突发生率降低12.3%。相关仿真与实验测试工作验证了所提方法在实际轨道物流场景中的可行性,体现了其在提升轨道物流系统智能化水平方面的应用价值。展开更多
In this paper, a new simulation approach for solving the mixed train scheduling problem on the high-speed double-track rail line is presented. Based on the discrete-time movement model, we propose control strategies f...In this paper, a new simulation approach for solving the mixed train scheduling problem on the high-speed double-track rail line is presented. Based on the discrete-time movement model, we propose control strategies for mixed train movement with different speeds on a high-speed double-track rail line, including braking strategy, priority rule, travelling strategy, and departing rule. A new detailed algorithm is also presented based on the proposed control strategies for mixed train movement. Moreover, we analyze the dynamic properties of rail traffic flow on a high-speed rail line. Using our proposed method, we can effectively simulate the mixed train schedule on a rail line. The numerical results demonstrate that an appropriate decrease of the departure interval can enhance the capacity, and a suitable increase of the distance between two adjacent stations can enhance the average speed. Meanwhile, the capacity and the average speed will be increased by appropriately enhancing the ratio of faster train number to slower train number from 1.展开更多
基金the National Natural Science Foundation of China (No. 51179102)
摘要This paper proposes a rail pressure tracking controller based on a novel common rail system. A mathematical model, based on physical equations, is developed and used for feed forward control design. Rail pressure peak sampling mechanism is designed to remove the disturbance of rail pressure due to fuel injection. All enhanced tracking differentiator is designed to get smooth tracking signal and exact differential signal from signal with noise. Double loop control strategy is designed to decouple the system and to improve dynamic performance of the system. Experimental results indicate that fluctuation of rail pressure is within il MPa in steady condition, while within ±3 MPa in transient condition, which verifies the effectiveness of the proposed rail pressure control strategy.
基金Supported by the National Natural Science Foundation of China(51406013)
摘要A frequency compensation control method for the opposed-piston two-stroke folded-cranktrain( OPFC) diesel engine's common rail system is presented as a result of the study of the loop-shaping theory. A common rail working process and the classical frequency control theory are combined to construct a frequency restriction of common rail pressure. A frequency compensator is utilized to improve the robustness of multiplicative perturbations and disturbance. The loop-shaping method has been applied to design the common rail pressure controller of the OPFC diesel engine. Simulation and bench test results show that in the condition of perturbation that comes from the effect of injection,multi-injection,fuel pumping of a pre-cylinder,and instantaneous pressure fluctuation,the controller indicates high precision. Compared with the original controller,this method improves the control precision by 67. 3%.
基金This project is supported by the Commission of Science Technology and Industry for National Defense, China(No.MKPT-02-291).
摘要A direct injection low compression ratios diesel rotary engine is designed and studied to find the appropriate application of the electronic controlled high pressure common rail injection system. Current development focuses on the applied fuel injection and ignition strategies, especially concerning the combustion configurations of injectors, ignition source, and combustion chamber. The prototype engine, equipped with Bosch common rail system and high performance electronic control unit (ECU), is designed correspondingly. Studies show that the integration of a common rail injection system and the main and pilot duel injectors configurations, assisted with glow plug ignition device and flexible ECU, represents a promising approach to improve the potential of the low compression ratios diesel rotary engine. Currently the engine can run at 6 kr · min^-1 steadily and the power is about 68 kW/(4 kr ·min^- 1).
摘要The Beijing-Zhangjiakou high-speed railway starts from Beijingbei railway station and ends at Zhangjiakou station, Zhangjiakou city. Changping workshop of high-speed railway of Beijing track maintenance division has the jurisdiction of about 122.3km (including Yanqing railway). According to the site situation, this paper summarizes and analyzes the problems in the use of the track control network (CPIII) in this section, and puts forward some improvement suggestions based on the experience, hoping to provide some enlightenment for the design of the high-speed railway precision measurement network in the future.
摘要在实现“双碳”目标的背景下,城市轨道交通需要实现节能低碳运行。现有牵引供电系统(traction power supply system,TPSS)采用下垂控制策略存在再生制动能量利用率低、缺乏对系统潮流主动有效控制及优化手段等问题。该文分析双向变流器的下垂参数对系统用电量的影响,进而提出一种实现牵引负荷功率最优分配的协同控制方法,该方法对双向变流器的下垂参数实时优化和调整,促进机车再生制动能量的流动,有效提高再生制动能量利用率,显著提升系统协同控制性能。经仿真计算,采用该方法可年节约0.17亿k W·h电量,有效助力城市轨道交通牵引供电系统安全、经济运行。
摘要为提升轨道物流系统的智能化与调度效率,提出了一种融合数字孪生技术与强化学习算法的轨道物流路径规划系统。首先,设计了一套层级分明、区域划分合理的控制系统架构,通过“分区域分层级”的混合控制网络,实现对物流机器人与轨道设施的高效协同管理。其次,构建符合ISO23247标准的“四层五空间”数字孪生系统架构,确保物理系统与虚拟孪生体的高实时性与高一致性。针对多机器人路径冲突与路径规划效率问题,提出改进的双重深度Q网络算法(improved double deep Q-network,ID3QN),引入三维奖励机制(安全性、通行效率与时效性)与动作剪枝策略,有效提升路径规划的收敛性与稳定性。实验结果表明,该系统在复杂动态环境中展现出良好的调度性能,机器人平均路径时间缩短9.1%,冲突发生率降低12.3%。相关仿真与实验测试工作验证了所提方法在实际轨道物流场景中的可行性,体现了其在提升轨道物流系统智能化水平方面的应用价值。
基金Project supported by the National Basic Research Program of China(Grant No.2012CB725400)the National Natural Science Foundation of China(Grant No.71131001-1)the Research Foundation of State Key Laboratory of Rail Traffic Control and Safety,Beijing Jiaotong University,China(Grant Nos.RCS2012ZZ001 and RCS2012ZT001)
摘要In this paper, a new simulation approach for solving the mixed train scheduling problem on the high-speed double-track rail line is presented. Based on the discrete-time movement model, we propose control strategies for mixed train movement with different speeds on a high-speed double-track rail line, including braking strategy, priority rule, travelling strategy, and departing rule. A new detailed algorithm is also presented based on the proposed control strategies for mixed train movement. Moreover, we analyze the dynamic properties of rail traffic flow on a high-speed rail line. Using our proposed method, we can effectively simulate the mixed train schedule on a rail line. The numerical results demonstrate that an appropriate decrease of the departure interval can enhance the capacity, and a suitable increase of the distance between two adjacent stations can enhance the average speed. Meanwhile, the capacity and the average speed will be increased by appropriately enhancing the ratio of faster train number to slower train number from 1.