共查询到17条相似文献,搜索用时 625 毫秒
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轿车液力变矩器的改进设计方法研究 总被引:2,自引:0,他引:2
由于工作介质流动状况复杂,难以形成准确、可靠的轿车液力变矩器设计方法,本文建立了液力变矩器内流场的计算模型,得到了正确,可信的轿车液力变矩器内流场计算结果,在分析后,本文认为泵轮流道入口处的径向扩张影响了液力变矩器的性能,依此,本文成功地改进了该液力变矩器。 相似文献
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液力变矩器是一种以液体为介质的叶片机械,它能将发动机的机械能平稳地传到车轮,使车辆实现无级传动。介绍了如何在液力变矩器的研制中运用CAD/CAM一体化技术。由于新技术的采用,保证了液力变矩器的制造精度。 相似文献
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自动变速器(三):—液力变矩器的闭锁与滑差控制 总被引:2,自引:1,他引:2
1 概述液力变矩器(TC)的性能优越,但最大的缺陷是效率低,为了降低装用液力变矩器汽车的油耗,而采用了闭锁(LU),它是指在液力变矩器的泵轮与涡轮之间,安装一个可控制的离合器,当汽车的行驶工况达到设定目标时,控制离合器将泵轮与涡轮锁成一体,液力变矩器随之变为刚性机械传动,其目的是:a. 提高传动效率。闭锁后消除了液力变矩器高速比工况时效率的下降,理论上闭锁工况效率为1,从而使高速比工况效率大大提高(见图1阴线区)。图1 液力变矩器特性与闭锁b. 闭锁后功率利用好,也提高了汽车的动力性。c. 由于效率的提高,液力变矩器… 相似文献
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本文推导了适合于液力变矩器叶片设计的S_1流面改进流线曲率法计算方程,提出了流场判别准则和环量分配原则。在此基础上,提出了用多个S_1流面积叠进行变矩器叶片设计的准三维方法,以及在传统的叶片设计方法中加入流场计算环节的叶片设计新途径。并把利用本文提出的设计方法和利用传统的设计方法所设计出来的YB300变矩器进行了特性试验对比,结果表明:新提出的设计方法与传统方法所设计出的变矩器相比,最高效率提高了1.80%,而其它性能基本相同。 相似文献
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Performance estimation model of a torque converter part I: Correlation between the internal flow field and energy loss coefficient 总被引:3,自引:0,他引:3
B. S. Kim S. B. Ha W. S. Lim S. W. Cha 《International Journal of Automotive Technology》2008,9(2):141-148
The objective of this paper is to improve the performance estimation model of the internal flow field of a torque converter.
Compared with performance experiment results, the converter based on the one-dimensional model does not satisfy the performance
requirements demanded in practice. Therefore, we need to develop more predictable and reliable performance estimation models.
In order to obtain shape information on three-dimensional blade geometry, a process of reverse engineering conducts a torque
converter assembly, impeller, turbine and stator. In addition, a CFD simulation including mesh generation and post-processing
was carried out to extract equivalent parameters from the internal flow field. The internal flow field can be explained by
analyze the correlation between a performance estimation model and CFD analysis. The equivalent performance model adopts the
variation of energy loss coefficients for a given operating condition according to the application of a changing energy loss
coefficient by the least mean squares method. The estimated equivalent model improves the agreement in performance between
experiments and the theoretical model. This model can reduce the error to within about 3 percent. Furthermore, this procedure
for predicted performance achieves eminence in the estimation of the capacity factor. 相似文献
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本文对外分流液力机械变矩器的多种方案作了分析,确定FB_2-323变矩器为原型变矩器。同时,计及行星传动中能量损失,进行了SPFB_2-323变矩器的特性计算,并且成功地研制出这种新型变矩器的样品。 相似文献
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为改变工程车辆传统设计计算与绘图的繁复和难以形式化的不足及其设计、制造囿于二维工程图的落后现状,进行了工程车辆行走机构计算机辅助仿真设计研究。运用实体参数化设计软件Pro/Engineer,结合ZL50C轮式装载机驱动桥零部件结构图样,完成了装载机行走机构零件的三维实体造型仿真设计、部件及总成的虚拟装配设计。这种设计方法有效缩短了设计周期,降低了研制费用,提高了设计水平,为工程车辆零部件及总体的各种技术分析和无纸自动化设计与制造奠定了基础。 相似文献
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自动变速器技术的最新动态和发展趋势 总被引:7,自引:0,他引:7
随着车辆自动变速器理论与设计制造技术的不断完善,其应用范围越来越广泛。文中指出,自动变速器技术的发展方向是多挡化、电控化,液力变矩器自锁区域的低速化以及其传动部件的小型化、大容量化和高强度化;而无级变速器技术的发展则呈现轻量小型化、大容量化和控制最佳化的趋势。 相似文献
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以一个轻型客车为例,介绍客车车身造型中计算机辅助概念设计、三维建模、车身主图板制作以及造型动画演示设计的方法和过程。 相似文献
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Nonlinear Robust Control of Torque Converter Clutch Slip System for Passenger Vehicles Using Advanced Torque Estimation Algorithms 总被引:3,自引:0,他引:3
Jin-Oh Hahn Kyo-Il Lee 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2002,37(3):175-192
In this paper, a torque-estimation-based robust controller for passenger car torque converter clutch slip system is presented. The proposed robust controller uses only the measurements available from inexpensive sensors that are installed in current passenger vehicles for torque estimation and feedback control. A conventional full state observer along with a neural-network-based open-loop hydraulic actuator observer is designed to estimate the unknown driving load, and a neural-network-based turbine torque estimator considering the temperature of oil circulating the torque converter is developed for improved turbine torque estimation accuracy. The stability of the internal dynamics is also investigated, and the performance and robustness of the robust controller is validated by simulation studies. 相似文献