共查询到20条相似文献,搜索用时 250 毫秒
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轻度混合动力AMT系统换挡品质控制 总被引:4,自引:1,他引:3
具有固定传动比的机械自动变速器(Automatic manual transmission,AMT)车辆,在换挡过程中,传动比会发生改变,造成离合器主、从动盘产生转速差,会使车辆在换挡过程中不可避免地出现换挡冲击.装备AMT的启动/发电一体化电机(Integrated startergenerator,ISG)型轻度混合动力系统,在换挡过程中,可利用ISG电动机的辅助动力作用,快速控制动力源,提高换档品质.在传统AMT车辆换挡过程分析的基础上,结合轻度混合动力车辆的特点,建立了动力源控制模型,提出了ISG电动机、发动机和离合器联合控制的换挡品质控制策略,在换挡过程中控制动力源转矩和转速,减小了轻度混合动力AMT车辆换挡冲击和动力中断时间.台架试验结果表明,装备AMT的轻度混合动力系统采用所提出的控制策略较传统控制策略能更有效地提高换挡品质. 相似文献
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目前越来越多的车辆配备自动变速器,人们对乘车舒适性要求也越来越高,车辆在换挡过程中会引起乘员的不舒适性,因此对换挡品质进行研究具有重要意义。建立了自动变速器换挡过程的简化动力学模型,推导出在换挡过程中不同阶段的离合器传递扭矩与变速器输出轴的转矩,研究换挡冲击度与滑磨功变化规律。在Simulation X中建立了自动变速器动力学仿真模型,并对换挡过程进行分析。分析了结合元件不同油压变化规律对换挡冲击度与滑磨功的影响,获得提高换挡品质的有益结论。 相似文献
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电控自动变速器换挡过程自适应控制策略 总被引:7,自引:1,他引:6
为研究自动变速器换挡过渡过程,改善换挡品质,通过分析自动变速器换挡系统,建立行星自动变速器动力学模型,并应用此模型对换挡过程进行详细分析,得到换挡过渡过程的变化规律,同时对离合器充放油规律进行研究.研究表明,采用分阶段不同的控制策略可改善换挡过渡过程的品质,即得出采取分阶段自适应控制策略的必要性.分阶段控制过程即在换挡过程中先后采取:初始充放油自适应控制、开环自适应控制和闭环自适应控制.通过与理想参考模型进行比较,对控制参数进行实时在线修改,并将参数保存到电可擦除只读存储器(Electrically erasable programmable read-only memory,E2PROM),在下次换挡开始前提取修正后的参数,逐步改善换挡品质.通过试验,分别对离合器充放油过程、开环控制过程以及闭环自适应过程进行研究.结果表明,运用此控制策略可改善换挡品质. 相似文献
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双离合器式自动变速器传动系统的建模及换挡特性 总被引:9,自引:1,他引:8
分析双离合器式自动变速器(DCT)换挡过程中离合器的工作特性,建立换挡过程中的动力学模型。基于发动机的试验数据,利用神经网络建立发动机的数值模型。依据整车的各项参数,制定变速器的换挡规律,在此基础上提出各挡同步器的接合规律,制定变速器换挡及同步器接合的控制逻辑。基于Matlab/Simulink/Stateflow软件平台,建立DCT传动系统的仿真模型,依据仿真模型对车辆换挡过程的动态性能进行仿真。利用正交试验设计方法,分析换挡过程中离合器接合时刻及转矩变化对换挡品质的影响,提出实车试验优化换挡品质的方法。 相似文献
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笔者介绍了4L80-E自动变速器换挡品质液压控制系统的组成,分析了该自动变速器换档品质的液压控制原理。 相似文献
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为提高自相关过程的统计过程控制方法的灵敏度与可靠性,提出利用Hopfield网络来检测自相关过程的均值渐进型漂移.首先将质量特性观测值分解为原形与背景噪声,通过动态编码将原形存储于网络;而后采用"相对增加"和"大于均值"原则对观测值编码,再利用网络的联想学习功能滤去背景噪声,提取原形,并判断均值是否发生渐进型漂移.研究表明,所提方法适用于具有不同参数的自相关过程,既无需过程统计模型,也无需大量的历史样本进行权值训练,具有较高的灵敏度与可靠性. 相似文献
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针对过程均值偏移随机的情况,提出一种统计经济最优的指数加权移动平均控制图优化设计方法。该方法将过程受控、失控未检出、失控被检出并进行恢复这三个阶段定义为一个周期,分析了三个阶段的平均时长及质量成本构成,通过计算产品质量特性超出规格界限的概率量化缺陷产品所造成的质量损失,以单位时间内期望成本最小为目标建立指数加权移动平均控制图优化模型并设计了遗传算法,优化了样本容量、采样间隔、平滑界限和控制界限等参数。通过与休哈特均值控制图、传统指数加权移动平均控制图等进行对比验证了该模型的优越性。 相似文献
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基于提高换档品质的AMT换档规律研究 总被引:2,自引:0,他引:2
通过在Matlab/Simulink环境下使用该换档规律对车辆性能的控制仿真说明了该换档规律明显优于熟练驾驶员手动换档.该换档规律的研究结果丰富了车辆自动操纵理论,对提高AMT车辆的换档品质具有应用推广价值. 相似文献
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Multispeed transmissions can enhance the dynamics and economic performance of electric vehicles (EVs), but the coordinated control of the drive motor and gear shift mechanism during gear shifting is still a difficult challenge because gear shifting may cause discomfort to the occupants. To improve the swiftness of gear shifting, this paper proposes a coordinated shift control method based on the dynamic tooth alignment (DTA) algorithm for nonsynchronizer automated mechanical transmissions (NSAMTs) of EVs. After the speed difference between the sleeve (SL) and target dog gear is reduced to a certain value by speed synchronization, angle synchronization is adopted to synchronize the SL quickly to the target tooth slot’s angular position predicted by the DTA. A two-speed planetary NSAMT is taken as an example to carry out comparative simulations and bench experiments. Results show that gear shifting duration and maximum jerk are reduced under the shift control with the proposed method, which proves the effectiveness of the proposed coordinated shift control method with DTA. 相似文献
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We calculate the electrostatic potential generated by a charged conducting sphere located at some distance over a conducting substrate by means of two complementary approaches. The potential is then projected along the electron beam direction yielding the electron-optical phase shift. The scenario is compared with a uniformly charged sphere over the same substrate, a model that has been widely employed to interpret phase images of charged particles. We illustrate the implications of our findings in the context of transmission electron microscopy experiments performed on metallic nanoparticles, where this classical analysis can be considered as a useful and insightful starting point towards more accurate, yet more complicate, quantum mechanical approaches. 相似文献
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E. M. M. Manders 《Journal of microscopy》1997,185(3):321-328
Multicolour confocal microscopy has proven to be a successful technique for the analysis of the spatial relationship between different biological structures in the same preparation. However, when the positions of objects are compared, e.g. co-localization and distance measurements, any positional shift that arises between the colour components is clearly unacceptable. This paper presents a simple technique for measuring with high accuracy the positional shifts that occur between the colour components of an image. Multi-labelled microbeads were scanned using two or three different detection channels. The position of each microbead was calculated separately for each detection channel. In general, the two calculated positions of the same microbead (one for each channel) are slightly different. This difference is a measure of the positional shift between the colours. This method enables the measurement of shift with a high accuracy (20 nm), and it has been applied to images from several experiments. The results of these experiments will give the reader an impression of typical contributions of different effects (such as chromatic aberration, misalignment of optical components and inaccuracy of the scanning unit) on the amount of positional shift. 相似文献
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