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A continuously variable transmission, or CVT, is a type of automatic transmission that provides more useable power, better fuel economy and a smoother driving experience than a traditional automatic.[.p] Driving a car with a CVT The controls for a CVT are the same as an automatic: Two pedals (no clutch) and a P-R-N-D-L-style shift pattern. But while an automatic transmission has a set number of gear ratios (a.k.a. speeds), usually 4, 5 or 6, the CVT can constantly change the relationship of engine speed to car speed. When driving a car with a CVT, you never hear or feel the transmission shift -- it simply raises and lowers the engine speed as needed, calling up higher engine speeds (or RPMs) for better acceleration and lower RPMs for better fuel economy while cruising. Many people find the CVT disconcerting at first because of the way cars with CVTs sound. When you step on the accelerator, the engine races as it would with a slipping clutch or a failing automatic transmission. This is normal -- the CVT is adjusting the engine speed to provide optimal power for acceleration. How the CVT works Traditional transmissions use a gearset that provides a given number of ratios (or speeds). The transmission (or the driver) shifts gears to provide the most appropriate ratio for a given situation: Lowest gears for starting out, middle gears for acceleration and passing, and higher gears for fuel-efficient cruising. Though there are several types of CVTs, most cars use a pair of variable-diameter pulleys, each shaped like a pair of opposing cones, with a metal belt or chain running between them. One pulley is connected to the engine (input shaft), the other to the drive wheels (output shaft). The halves of each pulley are moveable; as the pulley halves come closer together the belt is forced to ride higher on the pulley, effectively making the pulleys diameter larger. Changing the diameter of the pulleys varies the transmissions ratio (the number of times the output shaft revolves for each revolution of the engine), in the same way that a 10-speed bike routes the chain over larger or smaller gears to change the ratio. Making the input pulley smaller and the output pulley larger gives a low ratio (a large number of engine revolutions producing a small number of output revolutions) for better low-speed acceleration. As the car accelerates, the pulleys vary their diameter to lower the engine speed as car speed rises. This is the same thing a conventional automatic or manual transmission does, but while a conventional transmission changes the ratio in stages by shifting gears, the CVT continuously varies the ratio -- hence its name. History of the CVT Leonardo DaVinci sketched the first CVT in 1490. Dutch automaker DAF first started using CVTs in their cars in the late 1950s, but technology limitations made CVTs unsuitable for engines with more than around 100 horsepower. In the late 80s and early 90s, Subaru offered a CVT in their Justy mini-car, while Honda used one in the high-mileage Honda Civic HX of the late 90s. Improved CVTs capable of handling more powerful engines were developed in the late 90s and 2000s, and CVTs can now be found in cars from Nissan, Audi, Honda, Ford, GM, and other automakers.: 問提問者：網友 | 2017-03-21

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連續可變變速器，或稱CVT，是能夠比傳統汽車變速箱提供更有效動力、更高燃油經濟性、更順暢駕駛感受的一種汽車變速箱。駕駛一輛帶CVT的汽車 CVT的控制機構與傳統變速箱相同：兩個踏板（不帶離合）和一個帶P-R-N-D-L檔位的波箱。傳統變速箱有一整套齒輪速比（用多少速來表示），通常是4速，5速或6速，而CVT能夠持續地改變發動機速度與汽車速度的比率。駕駛一輛帶CVT的汽車時，你不會聽到或感覺到變速箱的換檔－－它只是簡單地按需要提高和降低發動機速度，為了得到更好的加速而提升發動機速度（或轉速），在巡航時為了得到更好的燃油經濟性而降低轉速。許多人開始使用CVT時都有些手足無措，因為汽車帶CVT后感覺不同。當你踩上油門時，發動機象帶上空轉的離合器或損壞的汽車變速箱一樣轉動。而這是正常的－－CVT正在調節發動機速度，以便為加速提供最佳動力。 CVT如何工作傳統變速箱使用提供既定比率（或速度）的整套齒輪。變速箱（或傳動箱）變換齒輪，對既定的情況提供最適當的比率：最低的齒輪用于起步，中間的齒輪用于加速和超車，更高的齒輪用于省油的巡航。雖然有幾種CVT型號，大部分汽車都是使用一對可變徑滑輪，形狀象一對相向的圓錐，而且在兩者之間有一條金屬帶或鏈在運轉。一個滑輪連接著發動機（輸入軸），另一個連接著驅動輪（輸出軸）。每個滑輪的半部都是可移動的：當滑輪的兩個半部相互移近時，傳動帶被推向滑輪上更高的地方，從而有效增大滑輪的直徑。滑輪直徑的變換，改變了變速箱的比率（隨著時間的推移，輸出軸隨著發動機的轉動而轉動），就像十速自行車將車鏈放在更大或更小的齒輪上以改變比率。將輸入滑輪變小和輸出滑輪變大，可以提供低比率（發動機的大量轉動帶動少量輸出轉動）以得到更好的低速加速度。當汽車加速時，滑輪改變直徑，以便在汽車速度提升時降低發動機速度。這與傳統變速箱或手動變速箱的工作相同，但是傳統變速箱是通過變換齒輪、按檔位改變比率時，而CVT不斷地改變比率－－正如其名。 CVT的歷史萊昂納多.達芬奇于1490年設計出第一個CVT。在50年代末，荷蘭汽車制造商達夫最早在他們的汽車中使用CVT。但受到當時技術的限制，CVT對超過100馬力的發動機不適用。到了80年代末90年代初，斯巴魯在他們的約斯帝微車中提供了CVT。而本田于90年代末，在其高里程的本田思域HX中提供了一款CVT。90年代末21世紀初，研究出了能夠操縱更強勁發動機的改良過的CVT。現在，在日產、奧迪、本田、福特、通用和其它汽車制造商的汽車中，都可以找到CVT。: 回答者：網友

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