汽车自动变速箱常见的有四种型式，分别是液力自动变速箱(简称AT)、机械无级自动变速箱(简称CVT)、电控机械自动变速箱(简称AMT)、DCT（双离合自动变速箱Dual Clutch Transmission）。

　　There are four common types of automatic transmissions for automobiles, namely hydraulic automatic transmission (AT), mechanical continuously variable transmission (CVT), electronically controlled mechanical automatic transmission (AMT), and DCT (Dual Clutch Transmission).

　　AT不用离合器换档，档位少变化大，连接平稳，因此操作容易，既给开车人带来方便，也给坐车人带来舒适。但缺点也多，一是对速度变化反应较慢，没有手动变速箱灵敏;二是费油不经济，传动效率低变矩范围有限。

　　AT does not require a clutch to shift gears, with minimal gear changes and smooth connections, making it easy to operate and providing both convenience and comfort for drivers and passengers. But there are also many disadvantages. Firstly, it has a slow response to speed changes and is not as sensitive as a manual gearbox; Secondly, fuel consumption is uneconomical, with low transmission efficiency and limited torque range.

　　机械式无级自动变速箱的特点是变速比不是间断的点，而是一系列连续的值，从而能更好地协调车辆外界行驶条件与发动机负载，可充分发挥发动机潜力，提高整车燃料经济性，它使汽车具有没有漏洞的牵引性能，从而显著地提高整车性能。

　　The characteristic of a mechanical continuously variable automatic transmission is that the transmission ratio is not a discontinuous point, but a series of continuous values, which can better coordinate the external driving conditions and engine load of the vehicle, fully tap the potential of the engine, improve the fuel economy of the whole vehicle, and make the car have flawless traction performance, thereby significantly improving the overall performance of the vehicle.

　　电控机械自动变速箱在传统的手动齿轮式变速器基础上改进而来的，是综合合了 AT(自动) 和 MT(手动)两者优点的机电液一体化自动变速器;AMT既具有液力自动变速器自动变速的优点，又保留了原手动变速器齿轮传动的效率高、成本低、结构简单、易制造的长处。

　　The electronic mechanical automatic transmission is an improved version of the traditional manual gear transmission, which combines the advantages of both AT (automatic) and MT (manual) in an electromechanical hydraulic integrated automatic transmission; AMT not only has the advantages of automatic transmission of hydraulic automatic transmission, but also retains the high efficiency, low cost, simple structure, and easy manufacturing advantages of the original manual transmission gear transmission.

　　双离合器自动变速箱采用两套离合器，通过两套离合器的相互交替工作，来到达无间隙换挡的效果。DCT综合了AT和AMT的优点，传动效率高、结构简单、生产成本较低，不仅保证了汽车的动力性和经济性，而且极大地改善了汽车运行的舒适性。

　　The dual clutch automatic transmission adopts two sets of clutches, which work alternately to achieve seamless shifting. DCT combines the advantages of AT and AMT, with high transmission efficiency, simple structure, and low production cost. It not only ensures the power and economy of the car, but also greatly improves the comfort of car operation.

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