中英文文献翻译—双离合式自动变速器介绍
DSG双离合器变速器简介
DSG双离合器变速器简介(DCT）2008-08-01 11:28:30 来源:网络收集整理作者: 【大中小】浏览:103次评论:0条DSG的英文全称是Direct-Shift Gearbox，中文意思为“直接换挡变速器”，又叫双离合系统变速器(DCT)。
优点：装配DSG的目的是可以比自动变速器更加平顺地换档，不会有迟滞现象。
以奥迪推出的6挡“DSG”变速器为例DSG双离合器变速器结构及工作原理：这台6挡变速器内布置了3根轴和2个多片式离合器，一个多片式离合器连接1、3、5挡和倒车挡，另一个连接的是2、4、6挡，再加上灵敏的电液控制，两组传动装置可以同时工作。
这样当车子在正常运转的时候，一个传动系统保持运转，而另一个传动系统已经将齿轮啮合到更高的挡位。
当接近下一个换挡点时，控制在高挡位齿轮的多片式离合器就会被激活，同时关闭另一个离合器，两个多片式离合器的一合一闭几乎保持在同一时间内完成，就像是接力赛一样，这是解决顿挫感的关键所在，而整个过程往往只需要0.2秒的时间。
采用技术的主要车型：新奥迪TT和新奥迪A3，布加迪EB16.4 Veyron（威龙）DSG变速器的特点新一代DSG变速器采用了2个离合器和6个前进档的传统齿轮变速器作为动力的传送部件，这是目前世界上最先进的、具有革命性的自动变速器。
DSG变速器没有变矩器，也没有离合器踏板。
DSG变速器在传动过程中的能耗损失非常有限，大大提高了车辆的燃油经济性。
DSG变速器的反应非常灵敏，具有很好的驾驶乐趣。
车辆在加速过程中不会有动力中断的感觉，使车辆的加速更加强劲、圆滑。
百公里加速时间比传统手动变速器还短。
DSG变速器的动力传送部件是一台三轴式6前进档的传统齿轮变速器，增加了速比的分配。
DSG变速器的多片湿式双离合器是由电子液压控制系统来操控的。
双离合器的使用，可以使变速器同时有两个档位啮合，使换档操作更加快捷。
DSG变速器也有手动和自动2种控制模式，除了排档杆可以控制外，方向盘上还配备有手动控制的换档按钮，在行驶中，2种控制模式之间可以随时切换。
双离合器式自动变速器DCT
一、DCT系统的结构特点：
9. 故障率低和使用寿命长的原因？有三： （1）离合器与齿轮组前后布局，相距较远， 滑磨热影响量小，比传统的行星齿轮式合理。 （2）少了液力变矩器，简化了系统结构，提 高了传动效率，ATF油温低。 （3）省略了多个换档用的制动器和离合器， 减少了密封件和漏油点。
一、DCT系统的结构特点：
7. 变速手柄的档位排列方式，仍是：P、R、N、 D、S传统方式。有的车系还加装了手动换档 开关，在D档位时，手柄也可利用手动通道 上下微动，手动依次升档或降档行驶。
一、DCT系统的结构特点：
8. 两个不同尺寸的离合器，同轴心的套装在一起，以 相同的摩擦力矩Mc，交替传递发动机的转矩。 因离合器的最大摩擦力矩Mc为下式： Mc=ZPμRc （n.m） Z—摩擦面数；P—压盘上的油压作用力； μ—摩擦系数；Rc—摩擦片的平均摩擦半径。
四、DCT系统各档工作过程：
1. 一档—C1充油接合，同步器A1向前接合， 动力从Z1齿轮组输出，其他齿轮空转。
四、DCT系统各档工作过程：
2. 二档—C2充油接合，同步器A3向前接合，动 力从Z2齿轮组输出，其他齿轮空转。
四、DCT系统各档工作过程：
3. 三档—C1充油接合，同步器A1向后接合， 动力从Z3齿轮组输出，其他齿轮空转。
例如：
Golf-R32轿车性能参数比较表如下： 大众公司对Golf-R32分别装用手动变速器MT 与DCT自动变速器进行了性能对比试验，结 果证明：DCT式自动变速器，具有优良的燃 油经济性和动力性能。
汽车新技术论文双离合变速器重点讲义资料
双离合变速器谢强11204050327一、双离合变速器的概述DCT双离合变速器起源Dual Clutch Transmission(以下简称DCT)中文的表面意思是直接换挡变速器，DCT有别于一般的半自动变速箱系统，它是基于手动变速箱而不是自动变速箱，因此，它是AMT（机械式半自动变速器的一员）。
双离合变速器由法国人阿道夫·凯各雷斯（Adoiphe Kegresse）于第二次世界大战前发明，但他未能成功制造出顺利运行的型号。
直到1980年，英国人哈里·韦伯斯特（Harry Webster）才将它应用于福特Fiesta MK1、福特Ranger和标致205的原型之上。
1980年代，保时捷在Porsche 962C赛车上使用双离合变速器获得成功，式双离合变速器重新获得注意。
但因为变速器的可靠性和控制系统缺陷，直到2000年代才在民用车市场得到推广。
技术甚至被移植到摩托车之上。
DCT的发展就如其他汽车高科技一样，其设计都来自赛车运动，因此DCT变速器十分能够满足驾驶员对操控的需求，同时在民用量产是，有余它的基于手动变速箱这一本质，使得车辆较为节油，实现了现代社会汽车消费者的操控和节油并存的需求，也为喜欢手动变速器的驾驶者提供了最佳的选择。
DCT双离合变速器优势DCT带来低油耗的同时，车辆性能方面没有任何损失，同样具有出色的加速性的最高时速性，并且与传统自动变速去一样可以实现顺畅换挡，不影响牵引力。
配备了DCT的发动机，有余快速的齿轮能够马上产生牵引力和更大的灵活性，加速时间比手动变速器更加迅捷。
可以说，DCT变速器是目前世界上最先进的变速器系统之一。
DCT双离合变速器工作状态DCT通过与变速箱控制模块项链的电磁阀来调节控制双离合器的结合压力。
发动机动力通过曲轴和一个双质量的飞轮传递到双离合器。
离合器1负责控制奇数挡，离合器2负责控制偶数挡。
相当于将两套变速系统合二为一。
DCT变速系统所包含的智能电子液压换挡系统，双离合器，双动力输入轴和三个轴共同完成复杂的换挡操作。
双离合器式自动变速器简介
双离合器式自动变速器简介吉林大学牛铭奎葛安林金伦杭州依维柯汽车变速器有限公司徐彩琪【Abstract】In the paper, a type of automatic transmission with two wet clutches，that is based on the traditional parallel manual shift transmission，is introduced. It could shift without power off and improve the automobile’s power performance and fuel economy. This paper details its principle.【摘要】本文介绍了一种由双湿式离合器构成的自动变速器，它是基于传统的平行轴式手动变速器发展而来的，可以实现不中断动力换档，极大的提高了车辆的动力性与经济性。
本文在此详细的介绍了它的工作原理。
Topic words: Automatic transmission, Dual clutch, Wet clutch主题词：自动变速器双离合器湿式离合器1、前言目前，随着车辆操纵自动化的快速发展，汽车自动变速器正呈现蓬勃发展的趋势。
现在的汽车自动变速器主要有液力机械式自动变速器，即AT（Automatic Transmission）；无级变速器，即CVT（Continuously Variable Transmission）；以及近几年国内外正在花大力气研究的电控机械式自动变速器，即AMT （Automated Manual Transmission）。
特别是电控机械式自动变速器的发展，由于其具有目前汽车工业发展所要求的高燃油经济性、低排放和保护现有手动变速器生产投资的优点，正受到了各大汽车厂的重视。
电控机械式自动变速器的产生是基于传统的平行轴式手动变速器发展而来的，它研究的出发点是将现有的手动变速器自动化。
自动变速器中英文对照外文翻译文献
中英文对照外文翻译文献(文档含英文原文和中文翻译)How Automatic Transmissions WorkIf you have ever driven a car with an automatic transmission, then you know that there are two big differences between an automatic transmission and a manual transmission:There is no clutch pedal in an automatic transmission car.There is no gear shift in an automatic transmission car. Once you put the transmission into drive, everything else is automatic.Both the automatic transmission (plus its torque converter) and a manual transmission (with its clutch) accomplish exactly the same thing, but they do it in totally different ways. It turns out that the way an automatic transmission does it is absolutely amazing!In this article, we'll work our way through an automatic transmission. We'll start with the key to the whole system: planetary gear sets. Thenwe'll see how the transmission is put together, learn how the controls work and discuss some of the intricacies involved in controlling a transmission.Some BasicsJust like that of a manual transmission, the automatic transmission's primary job is to allow the engine to operate in its narrow range of speeds while providing a wide range of output speeds.Without a transmission, cars would be limited to one gear ratio, and that ratio would have to be selected to allow the car to travel at the desired top speed. If you wanted a top speed of 80 mph, then the gear ratio would be similar to third gear in most manual transmission cars.You've probably never tried driving a manual transmission car using only third gear. If you did, you'd quickly find out that you had almost no acceleration when starting out, and at high speeds, the engine would be screaming along near the red-line. A car like this would wear out very quickly and would be nearly undrive able.So the transmission uses gears to make more effective use of the engine's torque, and to keep the engine operating at an appropriate speed.The key difference between a manual and an automatic transmission is that the manual transmission locks and unlocks different sets of gears to the output shaft to achieve the various gear ratios, while in an automatic transmission, the same set of gears produces all of the different gear ratios. The planetary gear set is the device that makes this possible in an automatic transmission.GearsThis automatic transmission uses a set of gears, called a compound planetary gear set, that looks like a single planetary gear set butactually behaves like two planetary gear sets combined. It has one ring gear that is always the output of the transmission, but it has two sun gears and two sets of planets.Let's look at some of the parts:First GearIn first gear, the smaller sun gear is driven clockwise by the turbine in the torque converter. The planet carrier tries to spin counterclockwise,but is held still by the one-way clutch (which only allows rotation in the clockwise direction) and the ring gear turns the output. The small gear has 30 teeth and the ring gear has 72, so the gear ratio is:Ratio = -R/S = - 72/30 = -2.4:1So the rotation is negative 2.4:1, which means that the output direction would be opposite the input direction. But the output direction is reallythe same as the input direction -- this is where the trick with the twosets of planets comes in. The first set of planets engages the second set, and the second set turns the ring gear; this combination reverses the direction. You can see that this would also cause the bigger sun gear to spin; but because that clutch is released, the bigger sun gear is free to spin in the opposite direction of the turbineSecond GearThis transmission does something really neat in order to get the ratio needed for second gear. It acts like two planetary gear sets connected to each other with a common planet carrier.The first stage of the planet carrier actually uses the larger sun gearas the ring gear. So the first stage consists of the sun (the smaller sun gear), the planet carrier, and the ring (the larger sun gear).The input is the small sun gear; the ring gear (large sun gear) is held stationary by the band, and the output is the planet carrier. so theformula is:1 + R/S = 1 + 36/30 = 2.2:1The planet carrier turns 2.2 times for each rotation of the small sun gear. At the second stage, the planet carrier acts as the input for the second planetary gear set, the larger sun gear (which is held stationary) acts as the sun, and the ring gear acts as the output, so the gear ratio is:1 / (1 + S/R) = 1 / (1 + 36/72) = 0.67:1To get the overall reduction for second gear, we multiply the first stage by the second, 2.2 x 0.67, to get a 1.47:1 reduction. This may sound wacky, but it works.Third GearMost automatic transmissions have a 1:1 ratio in third gear. You'll remember from the previous section that all we have to do to get a 1:1output is lock together any two of the three parts of the planetary gear. With the arrangement in this gear set it is even easier -- all we have todo is engage the clutches that lock each of the sun gears to the turbine.If both sun gears turn in the same direction, the planet gears lockup because they can only spin in opposite directions. This locks the ring gear to the planets and causes everything to spin as a unit, producing a 1:1 ratio. OverdriveBy definition, an overdrive has a faster output speed than input speed.It's a speed increase. In this transmission, engaging the overdrive accomplishes two things at once. If you read How Torque Converters Work,you learned about lockup torque converters. In order to improve efficiency, some cars have a mechanism that locks up the torque converter so that the output of the engine goes straight to the transmission.In this transmission, when overdrive is engaged, a shaft that is attached to the housing of the torque converter (which is bolted to the flywheel of the engine) is connected by clutch to the planet carrier. The small sungear freewheels, and the larger sun gear is held by the overdrive band. Nothing is connected to the turbine; the only input comes from theconverter housing. Let's go back to our chart again, this time with the planet carrier for input, the sun gear fixed and the ring gear for output.Ratio = 1 / (1 + S/R) = 1 / ( 1 + 36/72) = 0.67:1So the output spins once for every two-thirds of a rotation of the engine. If the engine is turning at 2000 rotations per minute (RPM), the outputspeed is 3000 RPM. This allows cars to drive at freeway speed while the engine speed stays nice and slow.ReverseReverse is very similar to first gear, except that instead of the small sun gear being driven by the torque converter turbine, the bigger sun gear is driven, and the small one freewheels in the opposite direction. The planet carrier is held by the reverse band to the housing. So, according to our equations from the last page, we have:Ratio = -R/S = 72/36 = 2.0:1So the ratio in reverse is a little less than first gear in this transmission. Gear RatiosThis transmission has four forward gears and one reverse gear. Let's summarize the gear ratios, inputs and outputs:Gear Input Output FixedGear Ratio1st 30-tooth sun72-toothringPlanetcarrier2.4:12nd30-tooth sunPlanetcarrier36-toothring2.2:1Planetcarrier72-toothring36-toothsun0.67:1Total 2nd 1.47:13rd30- and 36-tooth suns72-toothring1.0:1OD Planet 72-tooth 36-tooth 0.67:1carrier ring sunRever se 36-tooth sun72-toothringPlanetcarrier-2.0:1Hydraulic SystemThe automatic transmission in your car has to do numerous tasks. You may not realize how many different ways it operates. For instance, here are some of the features of an automatic transmission:If the car is in overdrive (on a four-speed transmission), the transmission will automatically select the gear based on vehicle speed and throttle pedal position.If you accelerate gently, shifts will occur at lower speeds than if you accelerate at full throttle.If you floor the gas pedal, the transmission will downshift to the next lower gear.If you move the shift selector to a lower gear, the transmission will downshift unless the car is going too fast for that gear. If the car is going too fast, it will wait until the car slows down and then downshift.If you put the transmission in second gear, it will never downshift or up shift out of second, even from a complete stop, unless you move the shift lever.You've probably seen something that looks like this before. It isreally the brain of the automatic transmission, managing all of these functions and more. The passageways you can see route fluid to all the different components in the transmission. Passageways molded into the metal are an efficient way to route fluid; without them, many hoses would be needed to connect the various parts of the transmission. First, we'll discuss the key components of the hydraulic system; then we'll see how they work together.The PumpAutomatic transmissions have a neat pump, called a gear pump. The pump is usually located in the cover of the transmission. It draws fluid from a sump in the bottom of the transmission and feeds it to the hydraulic system. It also feeds the transmission cooler and the torque converter.The inner gear of the pump hooks up to the housing of the torque converter, so it spins at the same speed as the engine. The outer gear is turned by the inner gear, and as the gears rotate, fluid is drawn up fromthe sump on one side of the crescent and forced out into the hydraulic system on the other side.The GovernorThe governor is a clever valve that tells the transmission how fast thecar is going. It is connected to the output, so the faster the car moves,the faster the governor spins. Inside the governor is a spring-loaded valve that opens in proportion to how fast the governor is spinning -- the faster the governor spins, the more the valve opens. Fluid from the pump is fed to the governor through the output shaft.The faster the car goes, the more the governor valve opens and the higher the pressure of the fluid it lets through.Valves and ModulatorsThrottle Valve or ModulatorTo shift properly, the automatic transmission has to know how hard the engine is working. There are two different ways that this is done. Somecars have a simple cable linkage connected to a throttle valve in the transmission. The further the gas pedal is pressed, the more pressure isput on the throttle valve. Other cars use a vacuum modulator to apply pressure to the throttle valve. The modulator senses the manifold pressure, which drops when the engine is under a greater load.Manual ValveThe manual valve is what the shift lever hooks up to. Depending on which gear is selected, the manual valve feeds hydraulic circuits that inhibitcertain gears. For instance, if the shift lever is in third gear, it feedsa circuit that prevents overdrive from engaging.Shift ValvesShift valves supply hydraulic pressure to the clutches and bands to engage each gear. The valve body of the transmission contains several shift valves. The shift valve determines when to shift from one gear to the next. For instance, the 1 to 2 shift valve determines when to shift from first to second gear. The shift valve is pressurized with fluid from the governor on one side, and the throttle valve on the other. They are supplied with fluid by the pump, and they route that fluid to one of two circuits to control which gear the car runs in.The shift valve will delay a shift if the car is accelerating quickly. If the car accelerates gently, the shift will occur at a lower speed. Let's discuss what happens when the car accelerates gently.As car speed increases, the pressure from the governor builds. Thisforces the shift valve over until the first gear circuit is closed, and the second gear circuit opens. Since the car is accelerating at light throttle, the throttle valve does not apply much pressure against the shift valve.When the car accelerates quickly, the throttle valve applies morepressure against the shift valve. This means that the pressure from the governor has to be higher (and therefore the vehicle speed has to be faster) before the shift valve moves over far enough to engage second gear.Each shift valve responds to a particular pressure range; so when the car is going faster, the 2-to-3 shift valve will take over, because thepressure from the governor is high enough to trigger that valve.Electronic ControlsElectronically controlled transmissions, which appear on some newer cars, still use hydraulics to actuate the clutches and bands, but each hydraulic circuit is controlled by an electric solenoid. This simplifies the plumbing on the transmission and allows for more advanced control schemes.自动变速器如何工作如果你曾经驾驶过一辆带着自动变速器的车, 那么你就知道自动变速器和手动变速器之间有很大的不同:在一个带着自动变速器的汽车中没有离合器踏板。
双离合变速器论文
DCT双离合器式自动变速器原理及其解析摘要：文章详细地介绍了汽车新技术一双离合器自动变速器的结构、工作原理及工作特点．并分析了其在国内的应用前景。
关键词：双离合器；自动变速器；结构特点；应用前景1 .产生背景DCT的英文全称是double clutch transmission，中文意思是双离合器变速箱，提到双离合变速箱，大多数车友首先想到的是大众的DSG双离合变速器技术。
因为大众对该技术应用较早，也比较广泛，而且把其称为DSG(Direct-Shift Gearbox)。
确实，大众汽车的DSG 是当今车坛使用最为普遍也是最先适用于量产的双离合变速器技术，它采用了6个或者7个前进档的传统齿轮变速箱作为动力的传送部件，主要与具有高扭矩平台的发动机配合使用。
其实除了这两种叫法还有很多，比方三菱的SST，保时捷叫PDK，宝马叫DKG、福特、沃尔沃的Powershift，奥迪的S-Tronic等等。
1997年大众公司与博格华纳合作研发，率先将DCT应用在普通轿车上。
经过不懈努力，终于在2003年9月形成批量装车，至今已经生产了几百万辆DCT 版轿车。
目前大众旗下4个品牌共10款车型，如奥迪、高尔夫、途安等，均有DCT版本。
DCT是在手动变速器基础上开发的，其生产成本要低于自动变速器，目前售价与普通AT相当，但性能要好得多。
2.DCT的组成及工作原理DCT的总体结构，大致分为5个部分：动力输入装置双离合器传动轴从动轴和动力输出端。
双离合器是最重要的部件之一，根据离合器类DCT型的不同，可分为湿式多片双离合器和干式双离合器两大类，湿式双离合器是靠液压控制实现起步和换档操作的，因此，对液压系统控制精度要求非常高，湿式用的变速箱油比较多，体积较大，可以承受较大的扭力。
干式用的变速箱油较少，体积更小，更紧凑，效率更高，适合小型车，但能承受的扭力不如湿式大，干式双离合器的散热和摩擦片的，磨损补偿问题是控制的关键。
双离合自动变速器基于手动变速箱基础之上。
双离合是什么意思
双离合是什么意思双离合是什么意思双离合是什么意思？双离合变速箱简称DCT，英文全称为Dual Clutch Transmission，中文翻译过来应该为“直接换挡变速器”，因为其有两组离合器，所以也有不少人干脆就叫它双离合变速器。
双离合变速器有别于一般的自动变速器系统，它基于手动变速器而又属于自动变速器，除了拥有手动变速器的灵活性及自动变速器的舒适性外，还能提供无间断的动力输出。
而传统的手动变速器使用一台离合器，当换挡时，驾驶员须踩下离合器踏板，使不同挡的齿轮做出啮合动作，而动力就在换挡期间出现间断，令输出表现有所断续。
双离合的起源：双离合器变速箱由法国人在二战前发明，计划用于配备充满传奇色彩的雪铁龙Traction，但当时的市场状况并不适合商业应用。
双离合器变速箱在等待了半个世纪后才开始配备民用车。
双离合分类：双离合器分为干式和湿式两种，他们的区别就是湿式的离合器里面是有散热用的油，而干式的没有。
1、干式双离合器干式的离合器并不是不好，干式的离合器的摩擦力更大，带来的动力传递更直接，结构也更加简单，体积也可以做得更小。
大众在2007年底推出的新的7速DSG就是采用的干式离合器。
2、湿式双离合器湿式的离合相对比较先进，因为离合器里面的离合器片在换挡的时候会产生摩擦，湿式的离合器更有助于控制温度。
双离合变速器工作原理：双离合自动变速器（简称DCT）基于手动变速箱基础之上。
而与手动变速箱所不同的是，DCT中的两幅离合器与二根输入轴相连，换挡和离合操作都是通过一集成电子和液压元件的机械电子模块来实现。
而不再通过离合器踏板操作。
就像tiptronic液力自动变速器一样，驾驶员可以手动换挡或将变速杆处于全自动D挡（舒适型，在发动机低速运行时换挡）或S挡（任务型，在发动机高速运行时换挡）模式。
此种模式下的换挡通常由挡位和离合执行器实现。
两幅离合器各自与不同的输入轴相连。
如果离合器1通过实心轴与挡位1、3、5相连，那么离合器2则通过空心轴与挡位2、4、6和倒挡相连。
中英文文献翻译—双离合器变速箱
附 录A双离合器变速箱(Dual Clutch Transmission ，以下简称DCT)是当前发展最迅速的新型变速箱，它以传统手动变速箱为基础加入双离合器和电控组件，获得优异的性能表现和良好的燃油经济性。
已经成为继可变气门正时、可变气门升程、涡轮增压和缸内直喷之后的又一个技术亮点。
简单说来DCT 是两个传统手动变速箱的集合体(分别为奇数和偶数挡)，拥有两个离合器，两根输入轴，但仅有一根输出轴。
离合器的分离与接合，以及挡位切换都在电脑的掌控下通过液压机构进行控制，因此也能提供手动换挡模式。
动力传递效率高(意味着油耗低)、挡位切换迅速和成本低于传统自动变速箱是双离合器变速箱的三大优势，因此得到越来越广泛的应用。
双离合器变速箱由法国人Adolphe K égresse 在二战前发明，计划用于配备充满传奇色彩的雪铁龙Traction ，但当时的市场状况并不适合商业应用。
双离合器变速箱在等待了半个世纪后才开始配备民用车。
上世纪80年代初，保时捷自行研发了全球首台双离合器变速箱，利用电控系统将双离合器变速箱的结构变得足够紧凑，称为Doppelkupplungsgetriebe(德语，简称PDK)。
首款PDK 双离合器变速箱抢先配备956和962勒芒赛车，以及奥迪Sport Quattro S1拉力赛车，并获得不俗战绩。
并获得不俗战绩。
但赛场与市场毕竟存在不小的距离，但赛场与市场毕竟存在不小的距离，但赛场与市场毕竟存在不小的距离，双离合器又花费了双离合器又花费了二十年降低成本和提升耐用度才成功实现商用。
大众于2002年为高尔夫R32(第四代高尔夫，PQ34平台，2003款)配备DSG(Direct-Shift Gearbox)双离合器变速箱，这是双离合器变速箱首次配备量产车。
这是双离合器变速箱首次配备量产车。
与传统自动变速箱相比，与传统自动变速箱相比，与传统自动变速箱相比，大众的这台大众的这台DSG 省去了液力变矩器和行星齿轮组，取而代之的是湿式双离合器和简单的斜齿轮。
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附录附录A 外文文献原文Introduce dual-clutch automatic transmission The clutch is located in engine and transmission between engine and transmission power transfer "switch", it is a kind already can transmit power, and can cut off power transmission mechanism. Its major functions is to guarantee the car can smooth start, variable speed change Block transmission gears when reduce the impact load and prevent transmission overload. In general bus, auto shift by clutch separation and joints when, in separation and realize between mating have power transfer temporary interruption phenomenon. In the ordinary bus no effect, but the clock in your car, if the clutch master bad power behind the speed will slow, affect scores.In order to solve this problem, the early 1980s, the automotive engineering will make a double clutch system transmission, abbreviation vehicles.the (English name: Direct Shift Gearbox), assembly on the car, can eliminate shifting clutch of power transfer stagnation phenomenon. For example BuJiaDi EBl6.4 Veyron new 7 speed transmission is the device for double clutch, from a gear change to another gear, time can't exceed 0.2 seconds. Now, the double clutch has been applied to general from racing cars. Audi car company's new audi TT sports car and the new audi A3 have device the vehicles.the. These car assembly vehicles.the purpose is can more smoothly than automatic transmission gear shift, won't have hysteresis phenomenon.Double on-off gearbox (DCT) also called directly shift gearbox (vehicles.the). Count down it also has the nearly 70 years of history, but for a very long time and this gearbox are unknown, and the genuine used in mass production car is not long ago things. Double on-off gearbox advantages obviously, but its internal structure by comparison is very complicated. First of all it has two clutches respectively by electronic control and push by hydraulic system, and two clutches corresponding two groups of planetary gear transmission, so also corresponding complex is divided into two parts, the center of solid shaft is responsible for aset of gear, and hollow shaft responsible for another group. Visible double re-rotating the internal structure of the almost overturned thoroughly traditional gearbox form.The working principle of double on-off gearbox can be simple understanding for a clutch corresponding odd block, another clutch corresponding even block. When the vehicle hangs in a block, another clutch and corresponding next shift has been located in preparation condition, when Former gears separation is immediately jointing next shift gearbox, accordingly double on-off shift speed than the average gearbox even manual gearbox faster. Besides double on-off gearbox although internal complex, but the actual volume and weight compared with automatic transmission character and not how much more than manual gearbox, therefore equipment double on-off gearbox models not smooth too burdensome for himself.At present domestic in the sale equipment double on-off gearbox models numbered, representative is public its Wallace GTI, EOS leaps, and still cool and equipped with double on-off gearbox soar team and loungyee will also listed in the near future. In addition S40 also have double V olvo re-rotating version. And many of the cars are porsche adopted dual on-off gearbox.Audi the double clutch system transmission is a whole, there have been six gear, clutch and transmission assembly at the same facility, two clutch cooperate each other work. This good metaphor a car had two sets of clutch, are driver control a set, vice driver control another set. Are the driver hang 1 file loosen clutch pedal started, the deputy drivers advance hang pot 2 but trample clutch pedal, When the speed up ready to shift and are driver trample clutch pedal while vice driver namely loosen clutch pedal, second gear began to work. Thus omitted rotary-switching empty flash, continuous power transfer, and a bit like the relay race. Double clutch system two sets of clutch transmission system, through computer control coordination work.When the automobile driving in a normal, a clutch and transmission of a gear are linked together, the engine power transfer to the drive wheels, Computer based on the speed and speed for driver shifting intention judgement, foresight to control another clutch with another gear gears connected, but only is in the ready state, has not yet connected withengine power. Shift when first clutch disconnect, at the same time the first 2 clutch will have connected gears and engine joint. Besides, a clutch except gap is closed, another clutch is in the open.Two root transmission shaft respectively by first and second clutch to control and engine power connection and disconnected, are respectively responsible for 1, 3, 5 files and 2, 4 and 6 shifting gear transform. Considering the parts service life, the designer chose tanker diaphragm type clutch, clutch action by the hydraulic system to control.Vehicles.the transmission is mainly to consumer demand for driving sensation and vehicle fuel-efficient double request, for manual transmission drivers like provides the best choice. Equipped with vehicles.the engine because of fast gear conversion can arise immediately traction and greater flexibility, acceleration time than manual transmission more quick.Advantages:Power transmission coherent with higher efficiency and Editor this section,faults:Complex structure present and manufacturing cost is higher.附录B 外文文献中文翻译双离合式自动变速器介绍离合器位于发动机与变速器之间，是发动机与变速器动力传递的“开关”，它是一种既能传递动力，又能切断动力的传动机构。