共查询到18条相似文献,搜索用时 218 毫秒
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为了准确快速地预测钣金型液力变矩器在工作负载下壳体的膨胀变形、提高液力变矩器性能、减少由于整体轴向刚体位移导致与周围零件的干涉,借助三坐标测量仪及UG软件平台建立并简化了变矩器内流道模型和变矩器壳体模型;利用仿真软件Gambit,Fluent对内流道模型进行分析,得出了壳体所受油压面力和轴向力;最后,借助软件MSC.Patran和MSC.Nastran对液力变矩器壳体的膨胀变形进行模拟仿真预测,并通过试验对仿真的结果进行验证.试验结果表明:试验与仿真分析的结果基本吻合;液力变矩器的轴向位移与油压大小呈线性关系;最大应力出现在壳体循环圆曲率发生突变最大的部分;最大应变出现在泵轮出口面和涡轮进口面所对应的壳体上. 相似文献
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本文综述了液力控制自动变速器的液压控制系统管路压力的调节过程,由油泵建立起的管路油压经初级油压调节成为控制系统的工作油压,又经次级油压调节成为变矩器油压和润滑油压,但换档信号系统又对管路油压进行微调,由此提高自动变速器的工作稳定性。 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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(二)液力变矩器的结构与工作原理
液力变矩器是液力传动中的又一种型式,是构成液力自动变速器不可缺少的重要组成部分之一。它装置在发动机的飞轮上,其作用是将发动机的动力传递给自动变速器中的齿轮机构,并具有一定的自动变速功能。自动变速器的传动效率主要取决于变矩器的结构和性能。 相似文献
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④变矩器减压阀:变矩器减压阀的作用是把通向变矩器的压力油2调节后供给变矩器控制阀,使变矩器工作油压21保持在规定的范围内。如图218所示,被压力调节阀调节后的变矩器压力油2经过节流孔和变矩器减压阀后成为变矩器压力油21,它推动变矩器减压阀向右运动,变矩器压力油21排出,使变矩器油压21降低,直至达到与滑阀右侧的弹簧力达到平衡,使变矩器油压21的压力保持在规定范围内。 相似文献
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根据液力变矩器的工作原理及闭锁条件,制定液力变矩器控制策略。利用Simulink建立液力变矩器控制模型,并利用Cruise和Simulink进行联合仿真,验证控制策略的可行性。仿真结果表明,液力变矩器控制模型正确,闭锁离合器能够准确按照闭锁条件闭锁,并且可以显著改善车辆的燃油经济性和排放性能。本文的研究可以为液力变矩器的闭锁研究提供一定的理论依据。 相似文献
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D. M. Chun J. C. Lee J. C. Yeo S. H. Ahn S. S. Hong J. D. Jang 《International Journal of Automotive Technology》2011,12(2):273-280
In new slim torque converters, lock-up clutches are used to provide high fuel efficiency at low speed. However, the slimness
of the converters causes difficulty in heat dissipation, which may damage the friction material and shorten its life span.
A cooling hole in the lock-up piston reduces the heat but also reduces the torque because oil flows through the hole due to
the pressure difference between the two faces of the piston. In the early stages of the development of this type of torque
converter, designers must consider the minimum flow rate required to cool the friction material and the minimum torque capacity
required to transmit the engine torque. This research explored two methods of estimating these parameters. In the first method,
an estimation equation was derived by combining the response surface method with physical properties such as the centrifugal
force, a sudden expansion, a sudden contraction, and the steady flow energy equation. The second method involved the use of
an artificial neural network. The feasibility of the estimates based on statistics and on the artificial neural network were
confirmed in the design stage by comparing experimental and estimated data. An estimation program was created using the C#.Net
language and has been used for actual torque converter designs by the Korea Powertrain Company. 相似文献
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C. Szczepaniak A. Kesy Z. Kesy 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1991,20(5):283-295
In this work three first-order nonlinear, nonstationary differential equations describing a hydraulic torque converter in a power transmission system are used.
A linear model is obtained on the basis of these equations. This model is verified both theoretically and by an experimental test. On the basis of the calculations the torsional damping was determined. This permitted the damping performance of a power transmission system with a hydraulic torque converter to be defined and established. 相似文献
A linear model is obtained on the basis of these equations. This model is verified both theoretically and by an experimental test. On the basis of the calculations the torsional damping was determined. This permitted the damping performance of a power transmission system with a hydraulic torque converter to be defined and established. 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
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(5):283-295
Abstract In this work three first-order nonlinear, nonstationary differential equations describing a hydraulic torque converter in a power transmission system are used. A linear model is obtained on the basis of these equations. This model is verified both theoretically and by an experimental test. On the basis of the calculations the torsional damping was determined. This permitted the damping performance of a power transmission system with a hydraulic torque converter to be defined and established. 相似文献
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液力变矩器流场计算的压力修正法 总被引:5,自引:0,他引:5
本文通过建立流体流动通用方程的有限差分方程,使用交错网格和非正交适休坐标,采用速度—压力耦合的压力修正法求解液力变矩器内三维粘性流动,并将计算结果进行了验证。 相似文献
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J. Schoeftner W. Ebner 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2017,55(12):1865-1883
Automated and manual transmissions are the main link between engine and powertrain. The technical term when the transmission provides the desired torque during all possible driving conditions is denoted as powertrain matching. Recent developments in the last years show that double-clutch-transmissions (DCTs) are a reasonable compromise in terms of production costs, shifting quality, drivability and fuel efficiency. They have several advantages compared to other automatic transmissions (AT). Most DCTs nowadays consist of a hydraulic actuation control unit, which controls the clutches of the gearbox in order to induce a desired drivetrain torque into the driveline. The main functions of hydraulic systems are manifold: they initiate gear shifts, they provide sufficient oil for lubrication and they control the shift quality by suitably providing a desired oil flow or pressure for the clutch actuation. In this paper, a mathematical model of a passenger car equipped with a DCT is presented. The objective of this contribution is to get an increased understanding for the dynamics of the hydraulic circuit and its coupling to the vehicle drivetrain. The simulation model consists of a hydraulic and a mechanical domain: the hydraulic actuation circuit is described by nonlinear differential equations and includes the dynamics of the line pressure and the proportional valve, as well as the influence of the pressure reducing valve, pipe resistances and accumulator dynamics. The drivetrain with its gear ratios, moments of inertia, torsional stiffness of the rotating shafts and a simple longitudinal vehicle model represent the mechanical domain. The link between hydraulic and mechanical domain is given by the clutch, which combines hydraulic equations and Newton's laws. The presented mathematical model may not only be used as a simulation model for developing the transmission control software, it may also serve as a virtual layout for the design process phase. At the end of this contribution a parametric study shows the influence of the mechanical components, the accumulator and the temperature of the oil. 相似文献