共查询到20条相似文献，搜索用时 359 毫秒
1.
针对电动汽车动力锂电池,提出一种能够在恒流及变流放电工况下修正SOC估算误差的方法.首先以双阻容并联网络RC作为锂电池等效电路模型,采用最小二乘法对模型参数进行估计,再依据模型及实验数据构建锂电池非线性状态方程,对锂电池开路电压与SOC的关系进行拟合,最后结合EKF算法与安时积分算法估算锂电池SOC,并采用脉冲放电实验... 相似文献
2.
In this paper, an efficient model structure composed of a second-order resistance-capacitance network and a simply analytical
open circuit voltage versus state of charge (SOC) map is applied to characterize the voltage behavior of a lithium iron phosphate
battery for electric vehicles (EVs). As a result, the overpotentials of the battery can be depicted using a second-order circuit
network and the model parameterization can be realized under any battery loading profile, without a special characterization
experiment. In order to ensure good robustness, extended Kalman filtering is adopted to recursively implement the calibration
process. The linearization involved in the calibration algorithm is realized through recurrent derivatives in a recursive
form. Validation results show that the recursively calibrated battery model can accurately delineate the battery voltage behavior
under two different transient power operating conditions. A comparison with a first-order model indicates that the recursively
calibrated second-order model has a comparable accuracy in a major part of the battery SOC range and a better performance
when the SOC is relatively low. 相似文献
3.
何跃军 《深圳职业技术学院学报》2014,(5):8-12
介绍一种基于主从控制方式、采用无刷直流电动机驱动、中型电动车驱动控制器的设计方案,以及驱动系统的总体构成、主电路与驱动电路的设计原理、参数设计方法和主、从控制板通信原理.阐述了系统母线电流检测电路、蓄电池电压检测电路的设计原理,以及系统母线电流保护电路、蓄电池电压保护电路、启动加速预警保护等多种保护电路的设计方法.试验表明,该驱动控制系统制造成本低、调速控制性能好,保护措施完善,达到了设计目的. 相似文献
4.
为了提高电动车铅酸蓄电池的电池荷电状态(SOC)预测精度,将粒子优化算法(PSO)引入到支持向量机(SVM)中,建立了PSO-SVM电动车铅酸蓄电池SOC预测模型,模型输入量为电池的电压和电流,输出量为SOC。采用PSO算法对SVM的惩罚因子C和径向基函数宽度σ寻优,降低了SVM参数取值的盲目性,提高了预测精度。设计了铅酸蓄电池数据智能采集系统,并进行了实际运行车辆电池数据采集。在advisor2002软件中获取的电池数据和实际车辆电池运行数据的基础上,进行了模型训练和预测。结果表明,PSO-SVM预测模型相对传统的BP、RBF和SVM预测模型具有更好的精度和推广能力,满足了"SOC估算精度小于5%"的要求,从而表明该模型是有效的、可行的,并具有较好的工程实用价值。 相似文献
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6.
Chang-wen Zheng Shi-yao Zhou Zi-qiang Chen Yun-long Ge De-yang Huang Jian Liu Qi Yang 《浙江大学学报(A卷英文版)》2018,19(10):774-785
A lithium-ion polymer battery cell is an ideal energy source for underwater vehicles due to its high energy density and small volume. However, the performance of lithium-ion batteries in a 10 000 m deep sea is still unknown and is of particular concern in the design of 10 000 m autonomous remote vehicles (ARVs). In this paper, we explore how the external characterizing parameters of a LiFePO4 polymer battery during discharge are affected by a high pressure of 100 MPa and low temperature of 3 °C for simulating the conditions experienced in a 10 000 m deep sea environment. An unscented Kalman filter (UKF) algorithm is applied to estimate the state of charge (SoC) of a battery to investigate the influence of high hydrostatic pressure on SoC estimation due to changes in parameters. The results indicate that the LiFePO4 polymer battery works under 100 MPa hydrostatic pressure, but its parameters change obviously and influence SoC estimation. SoC estimation accuracy was improved through compensating the functions of open circuit voltage (OCV) versus the state of charge (OCV-SoC) of the battery in a 100 MPa hydrostatic pressure and a low temperature environment. 相似文献
7.
动力电池的荷电状态(State of Charge,SOC)是预估电动汽车剩余有效行驶里程的重要参数之一。为提高锂电池SOC 的估算精度,考虑了温度对锂电池特性的影响。通过实验得到温度对电池容量的关系曲线,以及得到OCV-SOC-T 的函数映射关系,基于二阶RC 等效电路模型,利用带遗忘因子递推最小二乘法(Forgetting Factor Recursive Least Square, FFRLS)对模型进行实时在线参数辨识。在不同温度和工况条件下,采用扩展卡尔曼滤波(Extended Kalman filter,EKF)和无迹卡尔曼滤波( Un-scented Kalman filter, UKF)算法对锂电池的SOC 进行估算并对比验证,结果表明,EKF 在动态压力测试工况(DST)和美国联邦城市运行工况(FUDS) 的均方根误差分别在4.93%和4.69%以内,UKF 在DST 和FUDS 工况下的均方根误差分别在1.47%和1.49%以内。研究结果表明,FFRLS联合EKF和UKF都可以实时估算SOC,且在不同温度和不同工况条件下,UKF算法相较于EKF算法,抗干扰能力更强,估算精度更高,收敛性更好。 相似文献
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9.
荷电状态(SOC)是电动汽车动力电池的核心性能指标。为了进一步提高锂离子电池组单体电池荷电状态预测精度,提出一种基于改进PNGV模型的电池内阻辨识与SOC预测。根据锂离子动力电池的特性分析,建立改进型PNGV模型。利用实验采集的数据和最小二乘算法实现内阻的在线识别。通过该内阻辨识算法,更加准确地反映电池的当前电压。根据预测更加准确的电压,从而提出基于数据融合PHM法预测电池的SOC,该方法基于实验数据和灰色预测模型来估算电池的荷电状态。仿真和实验结果表明,基于内阻辨识的SOC预测更准确,具有较强的工程实用性。 相似文献
10.
河蟹养殖自动作业船在作业过程中,准确估算蓄电池剩余电量是作业状态调整的关键因素之一。单一静态的蓄电池剩余电量估算算法难以满足特定系统下的需求,基于特定应用场合的复合型算法逐渐成为研究主流。以作业船蓄电池剩余电量估算为研究目标,基于二阶 RC 电路模型,结合扩展卡尔曼滤波算法,提出一种基于作业船实时工作特性的蓄电池剩余电量估算策略。通过模拟作业船实时工作条件,验证该算法的可用性。实验结果表明,该算法所获估计值相比理论值的平均误差为 3.35%,能够满足作业船蓄电池剩余电量估算要求,对水产养殖作业船电能管理具有一定现实意义。 相似文献
11.
如今电动汽车的发展十分迅速,其动力电池荷电状态SOC关系到锂电池及整车系统的安全、可靠运行,因为SOC表明了电池剩余电量。由于SOC是一个不可直接测量的非线性变量,因此设计一种精度高、可行性强的算法具有十分重要的意义。提出一种最优自适应增益非线性观测器（OAGNO）,用差分进化算法（DE）对观测器参数进行寻优。为了验证该方法的先进性,对型号为NCR18650GA的三元锂电池进行工况实验,结果表明,相比无迹卡尔曼滤波（UKF）,最优自适应非线性状态观测器具有更高的精度,误差在3%左右。 相似文献
12.
为了智能测量和研究直流稳压电源、蓄电池等电源的负载特性,设计了一台以TI公司的16位超低功耗单片机MSP430F169为中心控制的直流电子负载。外置16位D/A转化芯片ADS1115实时高精度采样电源电压和电流信号,经过单片机程序控制,单片机内置12位D/A转换电路输出一个直流信号并经过运放放大后驱动功率MOS管工作。MOS管作为功率消耗元件,整个电路构成了电压和电流闭环调节系统,可工作于恒压和恒流2种模式。被测电源的输出电压、输出电流和负载调整率可以实时测量并显示在图形液晶显示屏上,电流和电压的测量精度可达（0.02%±0.02%FS）。电子负载人机交互友好,测量精度高,单片机外围电路简单,可靠性高,扩充性好,具有很强的实用价值。 相似文献
13.
在大量先验数据的基础上,根据电池管理系统的采样数据,结合安时积分法和开路电压法,对电池SOC进行估算,同时考虑温度及单体电池的不一致性对电池性能的影响,根据不同温度与电池SOC之间的修正数据关系对上述算法进行高低端修正,实验结果表明此方法能够降低安时积分法估计电池SOC的累积误差,准确估算电池SOC,且具有较强的实用性和可靠性。 相似文献
14.
A model-based estimator design and implementation is described in this paper to undertake combined estimation of vehicle states
and tire-road friction coefficients. The estimator is designed based on a vehicle model with three degrees of freedom (3-DOF)
and the dual extended Kalman filter (DEKF) technique is employed. Effectiveness of the estimation is examined and validated
by comparing the outputs of the estimator with the responses of the vehicle model in CarSim in three typical road adhesion
conditions (high-friction, low-friction, and joint-friction roads). Simulation results demonstrate that the DEKF estimator
algorithm designed is able to obtain vehicle states (e.g., yaw rate and roll angle) as well as road friction coefficients
with reasonable accuracy. 相似文献
15.
孟琳君 《绵阳师范学院学报》2007,26(11):28-31
提出了OFDM系统中一种新的基于软信息迭代处理的信道估计算法。该算法将面向判决最小二乘估计算法和盲估计算法相结合,在估计器中构造了一种新的置信度量函数,根据解码和软映射重构的反馈信号置信度大小在两种估计算法中自适应选择,这样估计的信道频响可以有效提高软信息迭代接收性能,大大降低信道估计训练开销。仿真结果表明,该文提出的算法能有效跟踪信道时变,限制传统面向判决估计的错误传播,达到好的系统性能。 相似文献
16.
为了更加精确地估算锂电池荷电状态,建立能够反映电池动态工作特性的二阶RC等效模型。在模型参数辨识的基础上,先用数学分析、电路模型构建相关状态方程与观测方程,再结合扩展卡尔曼滤波算法,针对状态噪声与观测噪声的不确定干扰,提出一种自适应调整方案。通过锂电池放电实验,结合MATLAB仿真分析,验证了自适应调整后的卡尔曼滤波算法可更精确地预估锂电池荷电状态,与扩展卡尔曼滤波算法相比,该算法降低了约2.31%的误差。 相似文献
17.
Robert Henson Jonathan Templin Jeffrey Douglas 《Journal of Educational Measurement》2007,44(4):361-376
Consider test data, a specified set of dichotomous skills measured by the test, and an IRT cognitive diagnosis model (ICDM). Statistical estimation of the data set using the ICDM can provide examinee estimates of mastery for these skills, referred to generally as attributes. With such detailed information about each examinee, future instruction can be tailored specifically for each student, often referred to as formative assessment. However, use of such cognitive diagnosis models to estimate skills in classrooms can require computationally intensive and complicated statistical estimation algorithms, which can diminish the breadth of applications of attribute level diagnosis. We explore the use of sum-scores (each attribute measured by a sum-score) combined with estimated model-based sum-score mastery/nonmastery cutoffs as an easy-to-use and intuitive method to estimate attribute mastery in classrooms and other settings where simple skills diagnostic approaches are desirable. Using a simulation study of skills diagnosis test settings and assuming a test consisting of a model-based calibrated set of items, correct classification rates (CCRs) are compared among four model-based approaches for estimating attribute mastery, namely using full model-based estimation and three different methods of computing sum-scores (simple sum-scores, complex sum-scores, and weighted complex sum-scores) combined with model-based mastery sum-score cutoffs. In summary, the results suggest that model-based sum-scores and mastery cutoffs can be used to estimate examinee attribute mastery with only moderate reductions in CCRs in comparison with the full model-based estimation approach. Certain topics are mentioned that are currently being investigated, especially applications in classroom and textbook settings. 相似文献
18.
指数遗忘的最小的二乘法(RLS)用于受到时变方差扰动的ARMAX模型的参数估计时,存在严重的参数发散问题。本文针对此类恶劣情况(Worst case),通过引入外部激励,以改善估计参数的收敛性能,从而提高估计器的鲁棒性。对引入激励的抗噪声作用进行了理论推导和仿真研究。结果表明,所用方法能提高估计器能忍受的噪信比,加速估计器的收敛。 相似文献
19.
基于单片机SPCE061A控制电路,研制了一种电动车用智能充电器。详细叙述了硬件电路的工作原理、SMBus通信线路以及软件实现。实验结果表明：该充电器能正确监控和测量蓄电池状态,充电效果好,性能可靠,能减少充电损耗,延长蓄电池的使用寿命。 相似文献
20.
Luquire et al.'s impedance change model of a rectangular cross section probe coil above a structure with an arbitrary number of parallel layers was used to study the principle of measuring thicknesses of multi-layered structures in terms of eddy current testing voltage measurements. An experimental system for multi-layered thickness measurement was developed and several fitting models to formulate the relationships between detected impedance/voltage measurements and thickness are put forward using least square method. The determination of multi-layered thicknesses was investigated after inversing the voltage outputs of the detecting system. The best fitting and inversion models are presented. 相似文献