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车辆动力系统热管理技术的创新与应用
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作者 贺宏博 《汽车与新动力》 2024年第5期86-89,共4页
基于电池组、电机及控制系统中存在的散热问题,详细探究了车辆动力系统中热管理技术的最新研究动态及其在实际工程中的应用情况。通过数值模拟与实验验证,分析了相变材料、热电冷却技术,以及纳米流体等新热管理技术在车载动力系统中的... 基于电池组、电机及控制系统中存在的散热问题,详细探究了车辆动力系统中热管理技术的最新研究动态及其在实际工程中的应用情况。通过数值模拟与实验验证,分析了相变材料、热电冷却技术,以及纳米流体等新热管理技术在车载动力系统中的应用情况。结果表明,这些技术有效提升了动力系统在温度均衡性、运行稳定度及系统使用寿命等方面的性能,也增强了电动汽车的整体效能,为车辆动力系统热管理技术的开发及应用提供了参考。 展开更多
关键词 车辆动力系统 热管理 相变材料 热电制冷 纳米流体
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面向工况信息、车辆动力系统与智能控制的能量管理研究综述
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作者 许楠 睢岩 +2 位作者 岳凤来 刘俏 孔岩 《汽车工程学报》 2023年第4期444-455,共12页
汽车产业的蓬勃发展在给人民生活带来便捷的同时,也带来了能源与环境方面的双重问题,能量管理技术凭借其在节能减排领域的突出表现成为汽车研究与开发的一个重点方向。介绍了实现能量管理技术的三大要素,工况信息、车辆动力系统和能量... 汽车产业的蓬勃发展在给人民生活带来便捷的同时,也带来了能源与环境方面的双重问题,能量管理技术凭借其在节能减排领域的突出表现成为汽车研究与开发的一个重点方向。介绍了实现能量管理技术的三大要素,工况信息、车辆动力系统和能量分配策略,并总结了它们之间的关系,从这3个角度出发,对汽车能量管理研究进行分类介绍。提出了能量管理研究在区域交通调度、电网负荷调节等领域的发展方向,为今后的研究提供参考。 展开更多
关键词 能量管理 工况信息 车辆动力系统 能量分配策略
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改进NSGA-Ⅱ算法的液压混合动力车辆动力系统参数优化 被引量:3
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作者 陈有权 范丽丹 +1 位作者 张国福 杨丹 《机械设计与制造》 北大核心 2020年第11期179-182,187,共5页
在重载液压混合动力车辆动力系统中,存在参数匹配精度低、动力系统动力性能较差等问题,提出改进NSGA-Ⅱ算法的液压混合动力车辆动力系统参数优化方法。根据前置并联式液压混合动力系统的构型和传统发动机的特点,合理匹配液压二次元件参... 在重载液压混合动力车辆动力系统中,存在参数匹配精度低、动力系统动力性能较差等问题,提出改进NSGA-Ⅱ算法的液压混合动力车辆动力系统参数优化方法。根据前置并联式液压混合动力系统的构型和传统发动机的特点,合理匹配液压二次元件参数,构建重载液压混合动力车辆的动力系统环境。联合NSGA-Ⅱ约束条件,引入正态分布交叉算子和差分进化变异算子,将其差分向量与NSGA-Ⅱ算法结合,改进NSGA-Ⅱ算法的局限性,实现动力系统参数优化。实验结果表明:在相同工况下,采用改进NSGA-Ⅱ算法优化混合动力车辆动力系统参数效果较好,混合动力车辆的动力系统参数匹配精度最高可达89%,且混合动力车辆的燃油消耗损失率最低为3.5%,提高了混合动力车辆的动力性能,为该领域的研究奠定基础。 展开更多
关键词 改进NSGA-Ⅱ算法 液压混合动力 车辆动力系统 参数优化 液压二次元件 目标函数 动力算子
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基于键合图的混合动力汽车建模与仿真
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作者 王涛 王凯 +2 位作者 林秋丰 庄宗宪 李志远 《河北大学学报(自然科学版)》 CAS 北大核心 2017年第4期419-425,共7页
针对一套应用逆向差速器作为动力耦合机构的混合动力系统进行了研究,该系统结合了电机低速性能佳、低噪音的优点与发动机高速性能佳、能源供应链完整的特点,依据车辆在不同行驶工况下的功率需求以及驾驶员的不同车速需求,规划了混合动... 针对一套应用逆向差速器作为动力耦合机构的混合动力系统进行了研究,该系统结合了电机低速性能佳、低噪音的优点与发动机高速性能佳、能源供应链完整的特点,依据车辆在不同行驶工况下的功率需求以及驾驶员的不同车速需求,规划了混合动力系统的能量管理模式.本文重点分析了混动模式下的运动情形,采用功率键合图方法进行建模并推导其系统动态方程式,应用Matab进行仿真.仿真结果显示:依据BSFC将发动机设置在最佳经济转速内运行,控制HEV各动力组件的动态参数在高效率范围内运行,逆向差速器动力耦合机构满足车辆后轮需求功率,可实现低污染、低能耗的目标;应用功率键合图方法可准确地模拟车辆在NEDC2000行车模式下发动机、电机/发电机的性能变化曲线,该方法在混合动力驱动系统中多能量耦合的动态建模具有一定的优势. 展开更多
关键词 逆向差速器 混合车辆动力系统 键合图 建模 仿真
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某高速铁路路基动力响应研究 被引量:3
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作者 尹壮飞 曾鹏毅 《路基工程》 2016年第2期76-80,共5页
针对某高速铁路上的一处典型路基,基于车辆—轨道—路基大耦合系统,并在考虑轨道不平顺性的前提下,利用Fortran语言对列车荷载作用下高速铁路路基的动力响应进行深入的研究,同时开展了相关的参数研究,从土体深度、列车速度以及轴重等方... 针对某高速铁路上的一处典型路基,基于车辆—轨道—路基大耦合系统,并在考虑轨道不平顺性的前提下,利用Fortran语言对列车荷载作用下高速铁路路基的动力响应进行深入的研究,同时开展了相关的参数研究,从土体深度、列车速度以及轴重等方面对高速铁路路基的动应力相应进行研究。 展开更多
关键词 高速铁路 车辆—轨道—路基大耦合动力系统 路基 动力响应 有限元分析
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快速公交车辆选型分析 被引量:1
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作者 王静思 韩艳龙 《交通世界》 2017年第1期242-243,共2页
通过对车辆各部分尺寸、形式的比选,选择适合本设计路段运行的车辆,采用18m长铰接公交车辆能够满足路段的客流需求;动力系统采用技术成熟的柴油发动机提供动力;此外车辆还需配备左侧开门,以适应中央岛式车站的布设。车辆其他配置的选择... 通过对车辆各部分尺寸、形式的比选,选择适合本设计路段运行的车辆,采用18m长铰接公交车辆能够满足路段的客流需求;动力系统采用技术成熟的柴油发动机提供动力;此外车辆还需配备左侧开门,以适应中央岛式车站的布设。车辆其他配置的选择,也应根据现状选择合适的车型。 展开更多
关键词 车辆类型 车辆尺寸 车辆地板动力系统
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基于电池循环寿命的纯电动汽车变速器传动比的优化研究 被引量:3
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作者 郭海龙 张永栋 +1 位作者 张胜宾 王巍 《森林工程》 2017年第5期108-112,共5页
针对目前纯电动汽车电池寿命衰减快导致其使用成本高的问题,分析目前常规纯电动汽车动力系统参数匹配的方法和不足,以及电池循环寿命的影响因素,在此基础上,提出基于电池循环寿命的纯电动汽车动力系统参数匹配方法,该方法在保证纯电动... 针对目前纯电动汽车电池寿命衰减快导致其使用成本高的问题,分析目前常规纯电动汽车动力系统参数匹配的方法和不足,以及电池循环寿命的影响因素,在此基础上,提出基于电池循环寿命的纯电动汽车动力系统参数匹配方法,该方法在保证纯电动汽车动力性和经济性的基础上,以动力电池容量衰减率最低为目标对纯电动汽车动力参数进行匹配。以某款纯电动汽车为研究对象,运用ADVISOR仿真软件,结合电池寿命理论模型,建立纯电动汽车整车仿真模型,运用所提出的方法确定该车的动力系统参数。研究结果表明,运用基于电池循环寿命的纯电动汽车动力系统参数匹配方法所设计的纯电动汽车动力系统,在一个NEDC循环工况下动力电池容量衰减率降低了2.41%,从而降低了电动汽车使用成本。 展开更多
关键词 纯电动汽车 动力电池 循环寿命 车辆动力系统 参数匹配
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Dynamic behaviors and mitigation measures of a train passing through windbreak transitions from ground to cutting 被引量:2
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作者 CHEN Zheng-wei LIU Tang-hong +3 位作者 GUO Zi-jian HUO Xiao-shuai LIWen-hui XIAYu-tao 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第8期2675-2689,共15页
In this paper,the effects of a right-angle windbreak transition(RWT)from the flat ground to cutting on train aerodynamic and dynamic responses were investigated,then a mitigation measure,an oblique structure transitio... In this paper,the effects of a right-angle windbreak transition(RWT)from the flat ground to cutting on train aerodynamic and dynamic responses were investigated,then a mitigation measure,an oblique structure transition(OST)was proposed to reduce the impact of RWT on the train aerodynamic and dynamic performance.The results showed that in the RWT region,the airflow was divided into two parts.One part of the airflow induced a strong backflow in the flat ground position,and the other part of the airflow induced a strong backflow in the cutting position.Therefore,there were two lateral impacts on the train.For the head car with the OST,the drop ratios of the peak-to-peak values compared with RWT were 47%,40%,and 52%for the side force coefficient C_(Fy),lift force coefficient C_(Fz) and overturning moment coefficient C_(Mx),respectively.For the peak-to-peak value of the dynamic parameters,the drop ratios of OST compared with RWT were all larger than 50%.The maximum dynamic overturning coefficients for RWT and OST were 0.75 and 0.3,respectively. 展开更多
关键词 high-speed train windbreak wall CROSSWIND CFD train aerodynamics vehicle system dynamics
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Wear characteristics and prediction of wheel profiles in high-speed trains
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作者 韩鹏 张卫华 李艳 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第8期3232-3238,共7页
Wheel/rail relationship is a fundamental problem of railway system. Wear of wheel profiles has great effect on vehicle performance. Thus, it is important not just for the analysis of wear characteristics but for its p... Wheel/rail relationship is a fundamental problem of railway system. Wear of wheel profiles has great effect on vehicle performance. Thus, it is important not just for the analysis of wear characteristics but for its prediction. Actual wheel profiles of the high-speed trains on service were measured in the high-speed line and the wear characteristics were analyzed which came to the following results. The wear location was centralized from-15 mm to 25 mm. The maximum wear value appeared at the area of 5 mm from tread center far from wheel flange and it was less than 1.5 mm. Then, wheel wear was fitted to get the polynomial functions on different locations and operation mileages. A binary numerical prediction model was raised to predict wheel wear. The prediction model was proved by vehicle system dynamics and wheel/rail contact geometry. The results show that the prediction model can reflect wear characteristics of measured profiles and vehicle performances. 展开更多
关键词 high-speed trains wheel wear wear characteristics wear prediction vehicle system dynamics
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Comparison of the Overall CO_(2) Emissions of Different Powertrain Systems Depending on the Energy Sector Emissions
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作者 Tobias STOLL Hans-Jürgen BERNER AndréCASAL KULZER 《同济大学学报(自然科学版)》 EI CAS 2024年第S01期46-50,共5页
A circular and sustainable economy for the private transport sector requires a holistic view of the emitted CO_(2) emissions.Looking at the energy supplied to the vehicle in terms of a circular economy leads to defoss... A circular and sustainable economy for the private transport sector requires a holistic view of the emitted CO_(2) emissions.Looking at the energy supplied to the vehicle in terms of a circular economy leads to defossilisation.The remaining energy sources or forms are renewable electric energy,green hydrogen and renewable fuels.A holistic view of the CO_(2) emissions of these energy sources and forms and the resulting powertrain technologies must take into account all cradle-to-grave emissions for both the vehicle and the energy supply.In order to compare the different forms of energy,the three most relevant forms of powertrain technology are considered and a configuration is chosen that allows for an appropriate comparison.For this purpose,data from the FVV project“Powertrain 2040”are used[1]and combined with research data on the energy supply chain for passenger cars.The three comparable powertrain configurations are a battery electric vehicle,a fuel cell electric vehicle and an internal combustion engine hybrid vehicle fueled with electric fuel.First,the three selected powertrain configurations are presented in terms of their performance,weight,technology and other characteristics.A comparative analysis is carried out for different CO_(2) emissions of the electricity mix.The electricity mix is used for both the production of the vehicle and the energy.The results are presented in the form of cradle-to-wheel emissions,which consider the total CO_(2) emissions of the vehicle over its life cycle.Finally,the results are analyzed and discussed to determine which powertrain technology fits best into which energy sector CO_(2) emissions window. 展开更多
关键词 vehicles energy supply power system carbon emission
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Multi-objective optimization design method of the high-speed train head 被引量:22
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作者 Meng-ge YU Ji-ye ZHANG Wei-hua ZHANG 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2013年第9期631-641,共11页
With the continuous improvement of the train speed, the dynamic environment of trains turns out to be aerodynamic domination. Solving the aerodynamic problems has become one of the key factors of the high-speed train ... With the continuous improvement of the train speed, the dynamic environment of trains turns out to be aerodynamic domination. Solving the aerodynamic problems has become one of the key factors of the high-speed train head design. Given that the aerodynamic drag is a significant factor that restrains train speed and energy conservation, reducing the aerodynamic drag is thus an important consideration of the high-speed train head design. However, the reduction of the aerodynamic drag may increase other aerodynamic forces (moments), possibly deteriorating the operational safety of the train. The multi-objective optimization design method of the high-speed train head was proposed in this paper, and the aerodynamic drag and load reduction factor were set to be optimization objectives. The automatic multi-objective optimization design of the high-speed train head can be achieved by integrating a series of procedures into the multi-objective optimization algorithm, such as the establishment of 3D parametric model, the aerodynamic mesh generation, the calculation of the flow field around the train, and the vehicle system dynamics. The correlation between the optimization objectives and optimization variables was analyzed to obtain the most important optimization variables, and a further analysis of the nonlinear relationship between the key optimization variables and the optimization objectives was obtained. After optimization, the aerodynamic drag of optimized train was reduced by up to 4.15%, and the load reduction factor was reduced by up to 1.72%. 展开更多
关键词 High-speed train Multi-objective optimization Parametric model Aerodynamic drag Load reduction factor
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Research on dynamics of a class of heavy vehicle-tire-road coupling system 被引量:6
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作者 LU YongJie YANG ShaoPu LI ShaoHua 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第8期2054-2063,共10页
The dynamic tire force of heavy vehicle is a primary reason for road damage. This paper presents a mathematic model to restore the interacting process of vehicle-tire-road system and tries to find out the mechanics of... The dynamic tire force of heavy vehicle is a primary reason for road damage. This paper presents a mathematic model to restore the interacting process of vehicle-tire-road system and tries to find out the mechanics of interaction. A nonlinear tri-axle vehicle model with IBS (integral balanced suspension) is firstly proposed based on the detailed analysis of structural features of a heavy vehicle (DFL1250). The results indicate that the nonlinearities in the vehicle suspension contribute to improvement of ride comfort and to the reduction of dynamic tire force. Furthermore, an FRC (flexible rolling contact) tire model with the enveloping characteristics is added into the IBS model. The tire model considers both the tire contact history with rough road profile and the uneven distribution characteristics of vertical load. The FRC model is able to remove medium and high vibration components from uneven road profile due to its filtering feature. It is expected that these results could supply a new idea for vehicle-road interaction research. 展开更多
关键词 heavy vehicle balanced suspension enveloping property nonlinear coupling system stochastic road excitation
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Trajectory planning and yaw rate tracking control for lane changing of intelligent vehicle on curved road 被引量:25
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作者 REN DianBo ZHANG JiYe +1 位作者 ZHANG JingMing CUI ShengMin 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第3期630-642,共13页
The lateral control for lane changing of intelligent vehicle on curved road in automatic highway systems was studied. Based on trapezoidal acceleration profile, considering the curvature difference between starting la... The lateral control for lane changing of intelligent vehicle on curved road in automatic highway systems was studied. Based on trapezoidal acceleration profile, considering the curvature difference between starting lane and target lane, a new virtual trajectory planning method for lane changing on curved road was presented, and the calculating formulas for ideal states of vehicle in the inertial coordinate system during a lane changing maneuver were established. Applying the predetermined trajectory, the reference yaw angle and yaw rate for lane changing were generated. On the assumption that the information on yaw rate of vehicle can be measured with on-board sensors and based on the lateral dynamical model of vehicle, the yaw-rate-tracking control law was designed by applying nonsingular terminal sliding mode technology. Based on Lyapunov function method, the finite-time convergence property of the system was obtained from the phase-plane analysis. Simulation results showed that if the curvature difference between starting lane and target lane was not considered, then at the finishing time of lane changing, it was impossible to avoid the deviation of the virtual trajectory panned from the target lane, which increased with the decrease of curvature radius. With the trajectory planning method and yaw rate-tracking control law proposed in this paper and considering the curvature difference between the starting lane and target lane, the desired virtual trajectory for lane changing without deviation was obtained and the expected tracking performance was also verified by the simulation. 展开更多
关键词 intelligent vehicle lane changing trajectory planning yaw rate-tracking
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Vehicle height control of electronic air suspension system based on mixed logical dynamical modelling 被引量:10
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作者 SUN XiaoQiang CHEN Long +1 位作者 WANG ShaoHua XU Xing 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2015年第11期1894-1904,共11页
Due to the coexistence and coupling of continuous variables and discrete events, the vehicle height adjustment process of electronic air suspension system can be regarded as a typical hybrid system. Therefore, the hyb... Due to the coexistence and coupling of continuous variables and discrete events, the vehicle height adjustment process of electronic air suspension system can be regarded as a typical hybrid system. Therefore, the hybrid system theory was applied to design a novel vehicle height control strategy in this paper. A nonlinear mechanism model of the vehicle height adjustment system was established based on vehicle system dynamics and thermodynamic theory for variable-mass gas charge/discharge system. In order to model both the continuous/discrete dynamics of vehicle height adjustment process and the on-off statuses switching of solenoid valves, the framework of mixed logical dynamical(MLD) modelling was used. On the basis of the vehicle height adjustment control strategy, the MLD model of the adjustment process was built by introducing auxiliary logical variables and auxiliary continuous variables. Then, the co-simulation of the nonlinear mechanism model and the MLD model was conducted based on the compiling of HYSDEL. The simulation and experimental results show that the proposed control strategy can not only adjust the vehicle height effectively, but also achieve the on-off statuses direct control of solenoid valves. 展开更多
关键词 electronic air suspension system vehicle height adjustment hybrid system mixed logical dynamical EXPERIMENT
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Development of performance and combustion system of Atkinson cycle internal combustion engine 被引量:7
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作者 LIU FuShui SUN BaiGang +4 位作者 ZHU HuaRong HU TieGang DU Wei LI XiangRong ZHANG Zheng 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第3期471-479,共9页
The application of hybrid vehicle is a practical technical solution to the energy shortage and the environmental pollution.The internal combustion engine(ICE)plays a key role in the development of the hybrid vehicle.B... The application of hybrid vehicle is a practical technical solution to the energy shortage and the environmental pollution.The internal combustion engine(ICE)plays a key role in the development of the hybrid vehicle.Based on the requirements of the hybrid vehicle and the characteristic of Atkinson cycle,a set of designing methods for the Atkinson cycle gasoline engine is presented through the analysis of the optimized matching for the compression ratio,valve timing and the combustion chamber.The designing method has been verified by the bench test and the results show that the fuel consumption can be improved by12%–15%with the reduction of the low speed torque by 10%,and the low fuel consumption region in the fuel map extends significantly with the rated power almost keeping constant.It may be of great reference for the development of hybrid vehicle technology in China. 展开更多
关键词 hybrid vehicle Atkinson cycle compression ratio valve timing combustion chamber
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