共查询到20条相似文献,搜索用时 140 毫秒
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A Simulation Study on the Speed Ratio Variation Characteristics of Motor Controlled Metal V-belt CVT
建立了电机控制的金属带式无级变速器的动力学模型,并通过仿真,研究了其速比变化率对车辆性能的影响.为某车型装备此类CVT提供了控制电机转速范围选择的依据. 相似文献
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奥迪Multitronic无级变速器 总被引:3,自引:0,他引:3
奥迪公司装备在A62.8轿车上的Multitronic无级变速器是无级变速器技术上的一大突破,它在动力性、经济性、舒适性方面都比传统无级变速技术有很大进步。章介绍了Multitronic CVT的工作原理、基本结构、系统组成以及与同类车型的性能比较。 相似文献
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梅赛德斯-奔驰轿车首次在前轮驱动车辆上装备722.8无级变速自动变速器(CVT,图1)。过去在W169/W245车型系列上使用的前置自动变速器(FAT)被无级变速变速器(CVT)取代,CVT也成为了所有车辆的选装装备。 相似文献
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随着消费者对于驾乘舒适性与低油耗要求的日益强烈,作为无级变速器的代表,CVT无级变速器越来越多地出现在主流家轿的产品线当中,尤其是小排量车型,CVT的使用将令其燃油经济性优势进一步突出。现今大家所熟悉的CVT无级变速器多为钢带(链)式变速机构(图I),而在2010中国汽车变速器大会上,一个叫做GIF(吉孚)的德国企业带来了自己的另一种CVT无级变速器,他们称之为KRG——锥环式无级变速器(Cone-Ring Transmission,图2)。KRG锥环式无级变速器对于大多数人而言可能是个陌生的名词,不过, 相似文献
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日产(NISSAN)是目前唯一在各车型中主推CVT(无级变速器)的汽车生产厂商,目前有2款CVT使用比较广泛,即用于大排量(3.5 L)发动机的RE0F09A(变速器制造厂JACTO称为JF010E)无级变速器和用于2.5 L排量以下发动机的RE0F10A(变速器制造厂JACTO称为JF011E)无级变速器。大家比较熟悉的装备3.5 L发动机的日 相似文献
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2004年末,福特公司的Montego轿车即将上市.该车搭载了ZF公司最新开发的CVT无级变速器,成为首批搭载这种CVT无级变速器的美国轿车。这种新型的CVT.型号为CFT30,它是第一台采用链条传动的CVT.为了达到良好的性能.CFT30同时装有一个液力变矩器。CFT30能与扭矩高达310Nm的发动机相匹配.其性能和燃油经济性超过了目前4档自动变速器和最新开发的6档自动变速器。 相似文献
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Heeyun Lee Juyean Sung Hyeokjun Lee Chunhua Zheng Wonsik Lim Suk Won Cha 《International Journal of Automotive Technology》2018,19(4):687-694
In this study, a model-based integrated control method for engines and continuous variable transmissions (CVTs) is developed. CVT refers to a type of transmission which allows an engine to be operated independently with respect to the vehicle speed, with the engine torque and CVT gear ratio controlled in an integrated manner. In the proposed integrated control scheme, engine operating points which minimize the rate of instantaneous fuel consumption are calculated, and the engine target torque and target gear ratio are determined in an integrated manner based on the results of the calculations. Unlike the previous map-based control method, the method introduced in this study does not require an engine torque map or a CVT ratio map for tuning, and the engine torque and CVT ratio are controlled to minimize the amount of fuel used while satisfying the level of acceleration demand from the driver. The control scheme is based on the powertrain model, and the CVT response lag and transmission loss are also considered in the integrated control processes. The algorithm is simulated with various driving cycles, with the simulation results showing that the fuel economy performance of the vehicle system is improved with the newly suggested engine-CVT integrated control algorithm. 相似文献
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《JSAE Review》1999,20(2):281-287
A new belt-drive continuously variable transmission (CVT) has been developed and installed in a 2-liter class vehicle for the first time in the world. This paper describes the technical features of this high torque capacity transmission, the need for a torque converter, the importance of electronic control and the driving modes achieved. This new CVT provides better driving performance and fuel economy than current CVTs and 4-speed automatic transmissions. 相似文献
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A modified CVT ratio map is proposed to obtain the improved fuel economy for a metal belt CVT. Since the CVT system loss,
which occupies most of the drivetrain loss, depends on the engine speed, input torque, primary and secondary actuator pressure,
a modified CVT ratio map is produced to realize the highest engine-CVT overall efficiency through the consideration of CVT
system loss. The modified CVT ratio map is constructed with respect to the demanded vehicle power and present vehicle speed
based on the steady state CVT system loss. Using the modified CVT ratio map, performance simulations are carried out using
the dynamic models of the CVT powertrain. The simulation results indicate that the modified CVT ratio control provides improved
engine-CVT overall system efficiency, and improves the fuel economy of the federal urban driving schedule by 4.9 percent. 相似文献
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《JSAE Review》1995,16(3):251-256
We have developed a continuously variable transmission (CVT) which has superior transfer efficiency, by thoroughly reducing transfer loss by means of using a dry hybrid belt, using no lubrication composition system around the belt, and using an electric control system of a DC motor.The fuel efficiency and driveability of the prototype vehicle equiped with the CVT were proven equivalent or even superior to a 5 speed manual transmission. 相似文献
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为了使机电控制无级变速器(CVT)能够可靠地传递转矩,快速地调节速比,结合某车型的结构性能参数,对机电控制CVT电控电动执行机构的设计方法进行研究。首先,对机电控制CVT电控电动执行机构的结构和工作原理进行分析,说明电控电动执行机构对CVT速比和从动带轮夹紧力的调节方法,从运动学和动力学的角度研究从金属带式无级变速器的传动机理,获得速比与主动带轮可动盘位移的关系以及保证主、从动带轮可靠传递转矩所需要的夹紧力;然后,根据整车的结构性能参数,明确汽车对机电控制CVT的功能需求和性能要求,以电控电动执行机构中直流电动机的负载转矩最小为目标,设计确定各碟形弹簧的参数和组合形式,在此基础上确定电控电动执行机构中电动机械传动系统的结构性能参数;最后,为验证所设计电控电动执行机构参数的正确性,利用所建立的机电控制CVT传动系统模型在ECE工况下对电控电动执行机构的性能进行仿真分析。结果表明:相对传统CVT液压执行机构,在ECE工况下机电控制CVT电控电动执行机构消耗的能量减少52.2%,同时设计的电控电动执行机构在ECE工况下能够实现实际夹紧力和速比对目标值的良好跟随。 相似文献