汽车电动门锁干扰脉冲的形成与抑制

结合工程实践中发现的门锁电动机产生干扰脉冲导致电子模块内部芯片烧毁的故障,对门锁电动机传导瞬态发射的形成机理进行分析,解释搭铁线上脉冲产生的原因,并提出解决方案,对电动门锁驱动电路的设计具有一定的指导意义。     

某型纯电动客车电机异常抖动分析

针对某型纯电动客车电动机振动大、舒适性差的问题进行故障诊断,最终确定引发故障的原因是电动机悬置软垫刚度偏低。采用电机主动防抖策略和提高电动机悬置软垫刚度两种减振方案,并通过有限元仿真,对优化后的模型的位移和加速度响应进行计算,最终获得较好的减振效果。     

断路器跳合闸线圈烧毁原因分析及二次改进

针对大岭变电站10kV开关柜跳、合闸线圈经常性烧毁的现状,分析了断路器在合闸过程中出现的由于辅助开关触点DL不能正常切断(跳)合闸回路,使得(跳)合闸线圈或(跳)合闸保持继电器线圈长期励磁、最终烧毁的原因,主要从二次方面考虑提出了三种可供选择的解决方案,避免跳、合闸线圈烧毁的发生,保证电网的安全、可靠运行。     

刮水电动机回位装置的利用

在论述汽车用刮水电动机回位装置工作原理的基础上，根据回位装置的结构特点，提出了利用回位装置对刮水电动机良数和测速的设想。利用回位装置的计数器，对刮水电动机输出齿轮的旋转圈数进行计数，可用于１２Ｖ和２４Ｖ电动机的寿命试验；利用回位装置测速，对刮水电动机齿轮轴转速进行测量，可用于生产线的最终检测，为提高的产品质量创造条件。     

50 kW直流发电机组滤波电路设计和优化

本文主要叙述了50 kW直流发电机组在运行的过程中出现滤波用电容板烧毁,经过分析和验证,找出了电容器板烧毁的原因,并对滤波电路进行了优化设计。     

汽车电动车窗防夹设计探究

介绍电动车窗的组成;通过建立防夹电动机的机械特性和电气特性模型并进行参数运算,研究了防夹模型的理论基础,得到电动机阻力和电流的关系以及车窗位置D的计算关系等;最后分析了防夹系统的硬件设计和软件设计。为电动车窗的设计提供最优化的方法。     

整流器管芯容量及结温降额设计在发电机中的应用

通过理论分析寻求经济可靠的办法，解决整流器管芯烧毁的现象，提高整流器的可靠性。     

基于人车最终距离的碰撞车速估算模型

人车碰撞事故的仿真再现须先估算碰撞车速,而当碰撞位置未知时,基于行人抛距与车辆后制动距离的车速估算方法无法采用。但由于注意到碰撞后人、车最终距离是可测的,故本文中利用它来估算碰撞车速。基于经典力学理论和若干假设,研究了行人抛距与车辆后制动距离间的关系,并据此建立了基于人车最终距离的碰撞车速估算模型,并对模型计算结果进行各种验证。结果表明,基于人车最终距离的碰撞车速估算模型的计算结果与PC-Crash的仿真结果及文献中的试验和典型案例数据都很吻合。     

军用混合驱动汽车的新探索

混合驱动汽车是一种采用混合电力驱动系统(简称混合驱动系统)的汽车。该系统由一台普通内燃机(柴油机)或燃料电池、一台发电机、一个电池组及若干电动机组成。发电机在内燃机驱动下向电池组充电,电池组则将电能供给电动机,由电动机驱动车辆行驶。与用普通内燃机及全电动车辆相比,混合驱动车辆具有以下优点:车辆燃油消耗量减少,效率提高;有害气体排放量减少;车辆动力性增加;     

基于博弈理论的新型HEV能量控制策略

对混合动力汽车（HEV）的能量管理提出了一种新的方法,主要是将HEV的行驶过程看作是发动机和电动机之间的合作博弈,发动机增大燃油利用率和减小排放量,电动机在稳定的范围内维持SOC值,使整车的效益达到最大化,采用博弈理论,引进数学表达式,合理地对汽车的能量进行管理。     

基于直接转矩驱动的电动车动态特性分析

根据异步电机直接转矩控制原理,在Matlab/Simulink软件环境下建立了电动汽车用异步电机的仿真模型和定子磁场定向下的DTC控制系统模型.以实际电动汽车用电机为例,对电动汽车的几个典型工况进行仿真分析.仿真结果表明,该电机及控制模型具有良好的稳态、动态性能,是一个很好的电动车驱动选择方案.     

Thermal anaysis of an electric water pump for internal combustion engine vehicles

An electric water pump for engine cooling system has an advantage which particularly in the cold start, the use of the electric water pump saves fuel and leads to a corresponding reduction in emissions. However, the electric water pump for internal combustion engine generates much more heat loss than that for hybrid electric vehicle or electric vehicle since it is operated by electric power of high current and low voltage. In this study, the fluid flow and thermal characteristics of the canned type electric water pump with an inverter integrated has been investigated under the effects of heat generation. The analysis conditions such as outdoor air temperature of 125°C, water pump speed of 6000 rpm, coolant temperature of 106°C and coolant flow rate of 120 L/min were used as a standard condition. Therefore, the thermal performance of the canned type electric water pump’s motor and inverter was evaluated by comparison with that of mechanical seal type. In the motor, the temperature reduced by over 10°C, and in the inverter, the amount of temperature decrease equaled to the maximum temperature difference, about 18.7°C. Also, canned type electric water pumps of variable materials were compared for the evaluation of thermal transfer performance for variable thermal conductivity of a can. The motor and inverter were cooled lower to 42°C at motor and about 40°C at inverter for reasonable selection of can’s thermal conductivity.     

脉冲路面下轮毂电机偏心对电动汽车平顺性影响

为了分析脉冲路面下轮毂电机偏心对电动汽车平顺性的影响,给出了脉冲路面车轮激励和开关磁阻电机激励的表示。建立了考虑轮毂电机质量和轮毂电机激励的电动汽车平面4自由度振动模型,推导出相应的状态方程和输出向量,确定了脉冲路面平顺性评价指标。实现了脉冲路面车轮激励和轮毂电机激励的仿真,在脉冲路面下进行了4种工况的平顺性仿真和比较。结果表明,脉冲路面下轮毂电机偏心对电动汽车平顺性有着不可忽视的影响,设计电动汽车时需要考虑轮毂电机偏心带来的负效应。     

结构-电磁激励下某电驱总成噪声控制

针对某电动汽车电驱总成的噪声问题，依据电驱总成车内噪声产生机理，进行整车状态声振特性测试，运用不同工况组合下的频谱特征和阶次特征等分析方法，识别出该电驱总成噪声问题为结构共振和电磁激励所致。针对结构共振问题，考虑电驱总成结构耦合特性、电机材料复杂多样性和线圈绕组质量，建立电驱总成有限元分析模型，求解出电驱总成的模态和振动响应，并通过敲击法模态试验得到模态参数进而对有限元模型进行验证，在此基础上以模态应变能为依据对电驱总成结构的局部刚度进行优化，提升结构共振频率，降低共振风险。针对电磁激励问题，以电驱总成中的永磁同步电机为研究对象，建立电磁仿真分析模型，以影响磁通密度的转子槽口的槽形、槽宽、槽深和槽间角度4个因素建立正交试验设计表，通过极差值得到各因素对齿槽转矩和输出转矩的影响水平，最后以降低齿槽转矩、加工工艺简单和对输出转矩影响小为目标，运用16组具有代表性的电磁方案，完成256个参数组合的寻优，并对优化方案进行了数值仿真计算。研究结果表明：优化方案的改善效果较显著；研究可为电动汽车车内噪声改善提供试验技术支持，并为电驱总成的结构共振噪声和电磁噪声控制提供方法参考。     

Dynamics characteristics analysis and control of FWID EV

Compared with internal combustion engine (ICE) vehicles, four-wheel-independently-drive electric vehicles (FWID EV) have significant advantages, such as more controlled degree of freedom (DOF), higher energy efficiency and faster torque response of an electric motor. The influence of these advantages and other characteristics on vehicle dynamics control need to be evaluated in detail. This paper firstly analyzed the dynamics characteristics of FWID EV, including the feasible region of vehicle global force, the improvement of powertrain energy efficiency and the time-delays of electric motor torque in the direct yaw moment feedback control system. In this way, the influence of electric motor output power limit, road friction coefficient and the wheel torque response on the stability control, as well as the impact of motor idle loss on the torque distribution method were illustrated clearly. Then a vehicle dynamics control method based on the vehicle stability state was proposed. In normal driving condition, the powertrain energy efficiency can be improved by torque distribution between front and rear wheels. In extreme driving condition, the electric motors combined with the electro-hydraulic braking system were employed as actuators for direct yaw moment control. Simulation results show that dynamics control which take full advantages of the more controlled freedom and the motor torque response characteristics improve the vehicle stability better than the control based on the hydraulic braking system of conventional vehicle. Furthermore, some road tests in a real vehicle were conducted to evaluate the performance of proposed control method.     

Cooperative control of the motor and the electric booster brake to improve the stability of an in-wheel electric vehicle

A cooperative control algorithm for an in-wheel motor and an electric booster brake is proposed to improve the stability of an in-wheel electric vehicle. The in-wheel system was modeled by dividing it into motor and mechanical parts, and the electric booster brake was modeled through tests. In addition, the response characteristics of the in-wheel system and the electric booster brake were compared through a frequency response analysis. In the cooperative control, the road friction coefficient was estimated using the wheel speed, motor torque, and braking torque of each wheel, and the torque limit of the wheel to the road was determined using the estimated road friction coefficient. Based on the estimated road friction coefficient and torque limit, a cooperative algorithm to control the motor and the electric booster brake was proposed to improve the stability of the in-wheel electric vehicle. The performance of the proposed cooperative control algorithm was evaluated through a hardware-in-the-loop simulation (HILS). Furthermore, to verify the performance of the proposed cooperative control algorithm, a test environment was constructed for the anti-lock braking system (ABS) hydraulic module hardware, and the performance of the cooperative control algorithm was compared with that of the ABS by means of a HILS test.     

Hydraulic control system design for a PHEV considering motor thermal management

In this paper, a design method for a PHEV hydraulic control system was proposed considering motor thermal management. Dynamic models of the target PHEV were developed including the hydraulic system, which consists of one mechanical and one electric oil pump. The required motor cooling flow was designed based on the motor temperature, which was obtained from a one-dimensional thermal equivalent circuit model including the heat source and oil spray cooling. Combining the PHEV powertrain model, hydraulic control system model, and the motor thermal model including the cooling system, an integrated simulator was developed for the target PHEV. Using the integrated simulator, the temperatures of MG1 and MG2 were investigated for various motor cooling flow rates when the PHEV underwent a highway driving cycle. The energy consumption of the hydraulic control system was also evaluated. It was found from the simulation results that a hydraulic control system of the target PHEV could be designed that satisfied the required flow for the motor cooling, lubrication and brake control using the design procedure proposed in this study.     

考虑弹性支撑边界条件的电动汽车-路面系统机电耦合振动特性分析

轮毂电机驱动电动汽车的簧下质量大导致轮胎动载荷增加,并且电机电磁力和转矩波动对车轮造成电机激励,进一步加剧车轮振动引起垂向振动负效应的问题。鉴于此,考虑电机的电磁激励,建立了电动汽车-路面系统的机电耦合动力学模型,推导了弹性支撑边界条件下路面结构的模态频率和振型表达式,以及路面振动引起的二次激励。计算了简支与弹性支撑边界条件下的路面模态频率,根据频率分布进行了截断阶数选取,并分析了边界条件、电机激励和车速对路面响应的影响。在此基础上,研究了不同行驶速度、路基反应模量及路面不平顺幅值下,激励形式对汽车车身加速度、悬架动挠度和轮胎动载荷的影响。结果表明：路面不平顺幅值越小,弹性支撑对路面响应的影响越大,弹性支撑边界条件下的路面响应较小,电机激励会引起路面响应的增加;弹性支撑边界条件下,路面不平顺幅值和路基反应模量越小,考虑路面不平顺、路面二次激励和电机激励的三重综合激励对电动汽车响应的影响越大,激励形式对轮胎动载荷的影响最大,对车身加速度的影响次之,对悬架动挠度的影响最小;电机激励导致轮胎动载荷增加,对路面破坏和寿命产生的负效应不容忽视。所建电动汽车-路面系统机电耦合模型及研究思路可为电动汽车垂向动力学分析提供参考与理论支持。     

基于功能安全的分布式驱动电动汽车前轮失效补偿控制

分布式驱动电动汽车可以实现四轮转矩分配和差动转向,提升整车的动力学控制性能和经济性,但是四轮转矩独立可控的特点也对功能安全提出挑战.当前轮单侧电机出现执行器故障失效情况时,不仅会产生附加横摆力矩降低车辆安全性,差动转向功能的存在还会使车辆严重偏航.基于此,在设计分布式驱动-线控转向一体化底盘的基础上,基于功能安全提出一...     

电动清扫车作业电机的转速和转矩的模糊控制

根据电动清扫车作业电机的工作特点,利用MATLAB软件中的模糊逻辑工具箱设计一个作业电机的模糊控制器。研究结果表明,电动清扫车的作业电机运用模糊控制器得到了良好的控制效果,能够很好地满足清扫车作业的需要。