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文章针对电动汽车电机控制器散热问题进行了分析,旨在使其工作在合适温度。建立了电动汽车电机控制器冷却器的三维模型,应用CFD(计算流体力学)方法对冷却器和功率模块的温度场进行了分析。分析结果描述了冷却器板、功率模块及水道在各入口水压下的温度场,并根据分析结果对水道进行了结构改进。改进后的分析结果表明,功率模块的温升有明显降低,这为控制器高效工作和延长其使用寿命提供了保证。 相似文献
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本文简述纯电动汽车驱动电机系统控制原理,并针对某纯电动汽车在连续颠簸路面驱动电机系统过流故障进行分析,基于永磁同步电机矢量控制的电压前馈补偿型电流调节器,提出了优化转速滤波的方案,通过实际路况验证,有效解决了连续颠簸路面驱动电机系统过流故障。 相似文献
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为了研究四轮毂电机驱动电动汽车电机功率在各轴之间的匹配与回收能量多少之间的关系,采用理论分析和仿真相结合的方法,对不同匹配方案下的能量回收效果进行了对比分析。基于相关标准要求,确定了整车和动力性参数,计算整车额定功率、峰值需求功率和轮毂电机额定转速、峰值转速等,并建立了整车需求功率的二次再分模型。该模型对整车需求功率先在前/后轴之间按一定比例分配,再将各轴需求功率在左右车轮间平均分配。通过对整车制动动力学的分析,对前/后轴制动力按照理想制动力分配策略的情况,提出了电机功率在各轴之间匹配的推荐方案。基于Matlab/Simulink和CarSim软件搭建四轮毂电机驱动电动汽车联合仿真模型,采用分层取样得到多个前/后轴轮毂电机功率分配方案,研究在理想制动力分配策略下,制动强度分别为0.1,0.2和0.3,以及新欧洲运行循环(NEDC)、中国城市乘用车工况(CCDC)和纽约城市运行循环(NYCC)3种典型循环工况下不同分配方案时制动回收能量的差异,得到前/后轴轮毂电机功率最优匹配,并对最优方案动力性进行了验证。理论和仿真结果表明:当前/后轴轮毂电机功率分配比与前/后轴静态垂直载荷比相近时,电动汽车将获得最好的能量回收效果。 相似文献
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驱动电机的控制技术是电动汽车的关键技术之一,对整车性能有决定性的影响。文中针对电动汽车的要求对直流驱动电机的控制系统进行研究,完成了控制系统软硬件设计。采用智能功率模块IPM作为强电回路的主要功率器件,设计中采用软件滤波和光电隔离的措施以提高系统的抗干扰能力,采用模糊PI调节对电枢电流和励磁电流进行闭环控制。试验表明,所设计的控制系统能够满足电动汽车的行驶要求,为进一步进行电动汽车的研究奠定了基础,积累了一定的技术经验。 相似文献
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在石油开采过度和环境污染等问题愈来愈严重的情况下,世界各国政府和汽车生产商加大了对电动汽车的研发力度。目前,轮毂电机驱动电动汽车作为一种比较新的电动汽车形式,正受到世界各国汽车生产商的青睐。为了提高电动汽车整车控制性能,往往是采用普通机械式传感器的方法来获取轮毂电机的转子位置信息,来对轮毂电机进行矢量控制,这种方法不利于汽车的轻量化且容易发生故障。为了实现轮毂电机的矢量控制,对永磁轮毂电机全速度范围无位置传感器控制方法进行了重点分析,并对电动汽车永磁同步轮毂电机无位置传感器控制技术发展进行了展望,认为信号注入法的改进、参数敏感问题及切换算法的改进是未来的研究方向和发展趋势。 相似文献
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设计一种纯电动汽车电机控制器直流母线电流采样电路,在此基础上提出一种电流采样故障的故障处理方法,该方法根据驱动系统当前状态实现了对电机控制器输入端直流母线电流的有效估算。当发生电机控制器直流母线电流采样回路故障后,利用估算值继续保证整车控制逻辑的正常执行,在保证安全行车的前提下,尽可能对驾驶员的驾驶感受进行保护。最后通过实车对该采样电路及故障机制进行验证。 相似文献
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重点阐述电动汽车用三相异步感应电动机的各种转矩与机械特性,通过公式分析得知转矩与电源电压和绕组电阻等的相互关系,从而为如何选配合理的电动汽车电机提供帮助。 相似文献
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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. 相似文献
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As more electrical equipment is installed and larger currents are required in vehicles, the automotive ground system becomes
more important to guarantee the stable operation of the equipment and efficient power consumption. In this paper, an automotive
ground system is analyzed in a steady-state condition, and a simulation model for estimating its ground voltage distribution
is described. The automotive ground system is divided into an engine compartment ground and a body ground, and it is modeled
as an equivalent resistor network, which is suitable for simulation. By using the developed model, ground voltages are simulated
and measurements are taken with a real car. A comparison of the simulation and measurement results shows good agreement, and
the validity of the model is confirmed. Then, the factors that dominate the ground voltage level are discussed. 相似文献
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目前,电动汽车研制的难点之一是传统电动机的转矩不够大,不得不使用变速机械来满足电动汽车起动和爬大坡的大转矩需求。本技术方案就是使用高于传统电动机常规电压的宽范围系列阶梯电压来驱动特制的轮毂电机车轮动力系统,以彻底解决当前研制电动汽车的这一难点,从而使现代电动汽车能早日大量使用,造福于人类。 相似文献
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介绍电动助力转向系统中永磁同步电机的故障诊断方法。重点对初始电机开路诊断法、电流失控诊断法和电压估算诊断法3种电机诊断方法进行了分析。 相似文献
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为更好地使用和调试DA阀的泵控系统,确保DA控制系统在工程机械上运用的灵活性,做到不同工况设备都能自动处在最佳状态工作,通过分析DA阀和DA泵的构造原理及测试曲线,论证DA泵的3个主要功能: 1)发动机转速控制排量功能,即操纵发动机油门踏板就可以改变泵的排量,从而改变车速的自动驾驶功能; 2)恒功率功能,即通过调节并锁定泵的设定,使泵有稳定的功率输出,以适应原动机的功率; 3)压力切断功能,即当泵的压力达到设定的最大极限压力时,控制泵的排量接近为0,以防发动机因负载过大而熄火。通过对具体设备液压系统主要参数的设定和调试,给出DA泵系统的调试方法与调试过程,以实现DA泵转矩与发动机转矩的最佳匹配,减小发动机功率损耗和防止发动机因负载过大而熄火,同时也减轻操作者的疲劳和负担。 相似文献
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S. B. Choi 《International Journal of Automotive Technology》2011,12(2):207-212
An adaptive control algorithm was developed for the sensorless speed control of a permanent-magnet DC motor directly connected
to the hydraulic pump of an antilock brake system. Due to the severe cost and reliability constraints of the application,
the motor speed was controlled by a very simple on-off switching method, in which the only measurement required is the voltage
across the control switch. The motor speed was calculated solely from the back-EMF voltage during the period of the control
cycle when the switching controller is in the switch-off mode. The stability of the developed adaptiveswitching control algorithm
was proven mathematically and confirmed experimentally in several vehicle tests over a wide range of target speeds and pump-load
conditions. The accuracy and the response time of the controller can easily be tuned by adjusting a single tuning parameter.
The switching frequency of the controller can also easily be tuned by adjusting the over-and undershoot thresholds independently
from the accuracy of the speed-tracking control. 相似文献
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J. Hur 《International Journal of Automotive Technology》2010,11(4):593-600
Motorization in vehicles is expanding rapidly for fuel efficiency, customer comfort, convenience, and safety features. These
new electric loads represent an increase in the required electric power. This has generated interest in new, higher power
systems such as the 42V Power Net. The electro-hydraulic power steering (EHPS) system is one of these systems. This paper
presents the development of the electric motor-driven pump unit for the EHPS system using a 42V power-Net. The interior type
permanent magnet synchronous motor (IPMSM) can be applied to this system with more power density per volume for compactness
of the EHPS. In order to improve the system, the IPMSM and its control method was optimized for improved torque characteristics
and electric power consumption. The performances of both the pump unit and the IPMSM have been verified by experimental results.
Finally, all in one type the electric motor-driven pump unit are developed from the experiment verification. 相似文献