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基于线控制动的分布式驱动电动汽车制动俯仰角舒适控制研究

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机械工程学报 2024年第10期60卷 463-475页

作者：张雷王祺王震坡丁晓林孙逢春北京理工大学电动车辆国家工程研究中心北京100081 北京电动车辆协同创新中心北京100081

车辆制动时车身俯仰角变化,尤其是停车前的“制动点头”现象,是造成制动舒适性下降的主要原因之一,显著影响车辆乘坐舒适性。以配备线控制动系统的分布式驱动电动汽车为研究对象,提出一种基于线控制动系统的制动俯仰角舒适控制策略。首... 详细信息

车辆制动时车身俯仰角变化,尤其是停车前的“制动点头”现象,是造成制动舒适性下降的主要原因之一,显著影响车辆乘坐舒适性。以配备线控制动系统的分布式驱动电动汽车为研究对象,提出一种基于线控制动系统的制动俯仰角舒适控制策略。首先根据驾驶员输入与车速参数判断制动意图。然后根据制动意图与车辆参数,设计制动模式切换流程;然后,在舒适制动模式下,设计基于模型预测控制的前后轴制动力控制算法;另外,设计双闭环反馈电液复合制动力平顺切换控制算法;最后,通过Simulink-Carsim联合仿真平台在轻度制动、正弦信号制动等多种工况下进行仿真验证。结果表明,所提出的控制策略能够在保证制动性能的前提下,明显减小制动过程中的车身俯仰角、角速度、角加加速度,且制动距离增加不超过20 cm,显著改善了制动舒适性。

关键词：线控制动制动舒适性制动意图分布式驱动电动汽车复合制动

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新能源汽车碳减排潜力分析

北京理工大学学报 2024年第2期44卷 111-122页

作者：王震坡詹炜鹏孙逢春邓钧君崔丁松黎小慧北京理工大学机械与车辆学院电动车辆国家工程研究中心北京100081

在“碳达峰、碳中和”双碳目标驱动下,新能源汽车凭借其碳减排优势受到了广泛关注.旨在促进新能源汽车碳减排潜力评估的相关研究,从新能源汽车碳排放计量与分析、车网协同优化低碳运行、车辆碳排放总量态势预测等三个方面进行分析与综述... 详细信息

在“碳达峰、碳中和”双碳目标驱动下,新能源汽车凭借其碳减排优势受到了广泛关注.旨在促进新能源汽车碳减排潜力评估的相关研究,从新能源汽车碳排放计量与分析、车网协同优化低碳运行、车辆碳排放总量态势预测等三个方面进行分析与综述,归纳了相关领域最新研究成果,总结各类建模方法优缺点,重点阐述了汽车节能减排核算体系与行业碳排放管理体系等相关成果,并提出新能源汽车碳减排潜力分析研究的发展趋势及未来研究方向.

关键词：新能源汽车碳排放减排潜力

Understanding the boundary and mechanism of gas-induced explosion for lithium-ion cells:Experimental and theoretical analysis

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Journal of Energy Chemistry 2023年第11期86卷 546-558,I0012页

作者： Tongxin Shan Xiaoqing Zhu zhenpo wang National Engineering Research Center of Electric Vehicles Beijing Institute of TechnologyBeijing 100081China Key Laboratory of Power Station Energy Transfer Conversion and System of Ministry of Education School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing 102206China

Thermal runaway(TR)of lithium-ion(Li-ion)batteries(LIBs)involves multiple forms of hazards,such as gas venting/jetting,fire,or even ***,as the most extreme case,is caused by the generated flammable gases,and a deflagration to detonation transition(DDT)may occur in this ***,overheat-to-TR tests and the corresponding outgas-induced explosion tests were conducted on 42 Ah Li-ion cells with Li[Ni_(1/3)Co_(1/3)Mn_(1/3)]*** sum of CO_(2),H_(2),C_(2)H_(4),CO,and CH4accounted for more than 90%of the ***/upper explosion limits(LEL/UEL),laminar flame speed,and ideal stable detonation pressure were calculated to interpret the explosion characteristics and *** turned out that shockwave was easily to be compressed and accelerated under higher state of charge(SOC)***,Li-ion cells explosion may evolve into unstable detonation in encapsulated battery pack and its evolution mechanism was explained,which provides a new idea for explosion-proof design of LIBs ***,a comprehensive assessment method was developed to intuitively characterize TR *** of explosion presented an upward trend with the increase of SOC while the sensitivity was not the *** study provides a further anatomy of TR,which is instructive to the safety of power battery systems.

关键词： Lithium-ion battery Thermal runaway Gas explosion Evolution mechanism Safety

Intelligent decision support platform of new energy vehicles

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Journal of Systems Engineering and Electronics 2022年第4期33卷 785-791页

作者： wang zhenpo SUN Zhenyu LIU Peng wang Shuo ZHANG Zhaosheng Collaborative Innovation Center for Electric Vehicles&National Engineering Laboratory for Electric Vehicles Beijing Institute of TechnologyBeijing 100081China Chongqing Innovation Center Beijing Institute of TechnologyChongqing 401135China

New energy vehicles(NEVs) are gaining wider acceptance as the transportation sector is developing more environmentally friendly and sustainable technology. To solve problems of complex application scenarios and multi-sources heterogenous data for new energy vehicles and weak platform scalability,the framework of an intelligent decision support platform is proposed in this paper. The principle of software and hardware system is introduced. Hadoop is adopted as the software system architecture of the platform. Master-standby redundancy and dual-line redundancy ensure the reliability of the hardware system. In addition, the applications on the intelligent decision support platform in usage patterns recognition, energy consumption, battery state of health and battery safety analysis are also described.

关键词： new energy vehicle(NEV) intelligent decision support platform software system data platform application

Post-Impact Motion Planning and Tracking Control for Autonomous Vehicles

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Chinese Journal of Mechanical Engineering 2022年第5期35卷 315-332页

作者： Cong wang zhenpo wang Lei Zhang Huilong Yu Dongpu Cao National Engineering Research Center for Electric Vehicles Beijing Institute of TechnologyBeijing 100081China School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China School of Vehicle and Mobility Tsinghua UniversityBeijing 100080China

There is an increasing awareness of the need to reduce traffic accidents and fatality due to vehicle ***-impact hazards can be more serious as the driver may fail to maintain effective control after *** avoid subsequent crash events and to stabilize the vehicle,this paper proposes a post-impact motion planning and stability control method for autonomous *** enabling motion planning method is proposed for post-impact situations by combining the polynomial curve and artificial potential field while considering obstacle avoidance.A hierarchical controller that consists of an upper and a lower controller is then developed to track the planned *** the upper controller,a time-varying linear quadratic regulator is presented to calculate the desired generalized *** the lower controller,a nonlinear-optimization-based torque allocation algorithm is proposed to optimally coordinate the actuators to realize the desired generalized *** proposed scheme is verified under comprehensive driving scenarios through hardware-in-loop tests.

关键词： Active safety Post-impact control Motion planning Vehicle dynamics control

Magnetic Coupler Robust Optimization Design for Electric Vehicle Wireless Charger Based on Improved Simulated Annealing Algorithm

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Automotive Innovation 2022年第1期5卷 29-42页

作者： zhenpo wang Lantian Li Junjun Deng Baokun Zhang Shuo wang School of Mechanical Engineering Beijing Institute of TechnologyNO.5 Zhongguancun StreetBeijingChina Collaborative Innovation Center of Electric Vehicles in Beijing NO.5 Zhongguancun StreetBeijingChina

Fleets of autonomous vehicles including shuttle buses,freight trucks,and road sweepers will be deployed in the Olympic Vil-lage during Beijing 2022 Winter *** requires intelligent charging infrastructure based on wireless power transfer technology to be *** increase the misalignment tolerance of a high-power wireless charger,the robustness of the magnetic coupler should be *** paper presents a new type of unipolar coupler,which is composed of three con-nected coils in *** dimensional configuration of the coils is analyzed by the finite element *** characteristic parameters of the coil are identified with their influence on the self-inductance and coupling *** expert model is built,whose feasibility can be verified in the aimed design *** with the expert model,an improved simulated annealing algorithm with a backtracking mechanism is *** primary coil can reach the expected characteristics from any starting parameter combination through the proposed optimization *** the same conditions in terms of external circuit parameters,ferrite usage,and aluminum shielding,the offset sensitivity of the magnetic coupler can be reduced from 58.79%to 18.89%.A prototype is established,validating the feasibility of the proposed coil structure with the optimized parameter algorithm.

关键词： Wireless power transfer Magnetic coupler Simulated annealing algorithm Robust optimization

Explosion behavior investigation and safety assessment of large-format lithium-ion pouch cells

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Journal of Energy Chemistry 2022年第9期31卷 241-257,I0007页

作者： Tongxin Shan zhenpo wang Xiaoqing Zhu Hsin wang Yangjie Zhou Yituo wang Jinghan Zhang Zhiwei Sun National Engineering Research Center of Electric Vehicles Beijing Institute of TechnologyBeijing 100081China Materials Science and Technology Division Oak Ridge National LaboratoryOak RidgeTN 37831United States State-assigned Electric Vehicle Power Battery Testing Center China North Vehicle Research InstituteBeijing 100072China

Large-format lithium-ion(Li-ion) batteries with high energy density for electric vehicles are prone to thermal runaway(or even explosion) under abusive conditions. In this study, overcharge induced explosion behaviors of large-format Li-ion pouch cells with Li[NiCoMn]Ocathode at different current rates(C-rates)(0.5C, 1C, 2C) were investigated. The explosion characteristics of the cells were elucidated by discussing the evolution of the cell voltage, the surface temperature and the shock wave ***, the whole overcharge process could be divided into four stages according to the evolution of several key parameters and the overcharge behaviors;the overcharge C-rate has a great influence on cells’ thermal behaviors. The experimental results showed that the thermal runaway process of Liion cells caused by overcharging consisted of two kinds of explosions, physical explosion and chemical explosion. The existence of observable negative pressure zone in the pressure curves indicated that the Li-ion cells are not a self-supplying oxygen system during the explosion. Further, the explosion dynamics parameters were matched. An explosion TNT-equivalent conversion strategy that depended on the pressure of the shock wave was utilized to evaluate the released energy and its hazards. In addition, with respect to the overcharge of Li-ion pouch cells, a safety assessment method and a safety management method were proposed based on the explosion behaviors. From the perspective of battery safety, this study is of great significance for the safety design of Li-ion cells and can provide guidance for engineers to optimize the safety function of battery packs.

关键词： Lithium-ion battery Overcharge Explosion behavior Safety Explosion dynamics

Thermal Property Measurements of a Large Prismatic Lithium-ion Battery for Electric Vehicles

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Journal of Thermal Science 2021年第2期30卷 477-492页

作者： CHENG Ximing TANG Yu wang zhenpo National Engineering Lab for Electric Vehicles Department of Vehicular EngineeringBeijing Institute of TechnologyBeijing 100081China

Because of the high cost of measuring the specific heat capacity and the difficulty in measuring the thermal conductivity of prismatic lithium-ion batteries,two devices with a sandwiched core of the sample-electric heating film-sample were designed and developed to measure the thermal properties of the batteries based on Fourier's thermal *** to electrical circuit modeling,two equivalent thermal circuits were constructed to model the heat loss of the self-made devices,one thermal-resistance steady circuit for the purpose of measuring the thermal conductivity,the other thermal-resistance-capacitance dynamic circuit for the purpose of measuring the specific heat *** the analytic method and recursive least squares,the lumped model parameters of these two thermal circuits were extracted to estimate the heat loss and correct the measured values of the self-made *** to the standard values of the reference samples of the glass and steel plates,the measured values were corrected to improve the measurement accuracies beyond 95% through steady thermal-circuit *** to the measured value of the specific heat capacity of the battery sample at 50% state of charge using the calorimeter,the measured value using the self-made device was corrected in order to elevate the measurement accuracy by about 90% through dynamic thermal-circuit *** verified through the experiments,it was reliable,convenient,and low cost for the proposed methodology to measure the thermal properties of prismatic lithium-ion batteries.

关键词： lithium-ion battery specific heat capacity thermal conductivity equivalent thermal circuit measurement

Overcharge-to-thermal-runaway behavior and safety assessment of commercial lithium-ion cells with different cathode materials:A comparison study

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Journal of Energy Chemistry 2021年第4期30卷 484-498页

作者： zhenpo wang Jing Yuan Xiaoqing Zhu Hsin wang Lvwei Huang Yituo wang Shiqi Xu National Engineering Laboratory for Electric Vehicles Beijing Institute of TechnologyBeijing 100081China Collaborative Innovation Center for Electric Vehicles in Beijing Beijing 100081China Materials Science and Technology Division Oak Ridge National LaboratoryOak Ridge 37831TNUSA Shanghai Jieneng Automotive Technology Co. Ltd.Shanghai 201804China State-assigned Electric Vehicle Power Battery Testing Center China North Vehicle Research InstituteBeijing 100072China

In this paper,overcharge behaviors and thermal runaway(TR)features of large format lithium-ion(Liion)cells with different cathode materials(LiFePO4(LFP),Li[Ni_(1/3)Co_(1/3)Mn_(1/3)]O_(2)(NCM111),Li[Ni_(0.6)Co_(0.2)Mn_(0.2)]O_(2)(NCM622)and Li[Ni_(0.8)Co_(0.1)Mn_(0.1)]O_(2)(NCM811))were *** results showed that,under the same overcharge condition,the TR of LFP Li-ion cell occurred earlier compared with the NCM Li-ion cells,indicating its poor overcharge tolerance and high TR ***,when TR occurred,LFP Li-ion cell exhibited lower maximum temperature and mild TR *** NCM Liion cells caught fire or exploded during TR,while the LFP Li-ion cell only released a large amount of smoke without *** to the overcharge behaviors and TR features,a safety assessment score system was proposed to evaluate the safety of the *** short,NCM Li-ion cells have better performance in energy density and overcharge tolerance(or low TR risk),while LFP Li-ion cell showed less severe response to overcharging(or less TR hazards).For NCM Li-ion cells,as the ratio of nickel in cathode material increases,the thermal stability of the cathode materials becomes poorer,and the TR hazards *** a comparison study on large format Li-ion cells with different cathode materials can provide deeper insights into the overcharge behaviors and TR features,and provide guidance for engineers to reasonably choose battery materials in automotive applications.

关键词： Lithium-ion battery Cathode materials Overcharge Thermal runaway Overcharge tolerance Safety assessment