The more gears the automatic transmission has, the smoother the driving is, the better the acceleration is, and the higher the fuel efficiency is. In addition to providing a relaxed and comfortable driving experience, it also has insurmountable disadvantages. The following is a simple understanding of the general automotive automatic transmission has which several functions.

首先，需要保持汽車自動變速箱的傳動比，以擴大驅動輪的扭矩和速度的更自然的變化范圍，從而滿足各種行駛條件下不斷變化的需求。在不改變汽車發動機工作方向的情況下，汽車可以在反向行駛中良好地行駛。

First of all, it is necessary to maintain the transmission ratio of the automatic transmission in order to expand the more natural variation range of the torque and speed of the driving wheel, so as to meet the changing needs under various driving conditions. Without changing the working direction of the engine, the car can run well in the reverse direction.

在道路上，當我們處于空檔時，如果需要中斷電源以傳輸能量，以便發動機可以正常啟動和怠速，并且變速箱在換檔或執行時可以輸出動力。

On the road, when we are in neutral, if we need to interrupt the power supply to transmit energy, so that the engine can start and idle normally, and the transmission can output power when shifting or executing.

由于現代發動機不成熟的性能，汽車自動變速箱應運而生。它在不同的工況下采用不同的傳動比，使車輛和發動機在各種工況下都能發揮良好的動態性能。因此，在正常使用期間，應定期維護和清潔，以免發生維修事件。

Due to the immature performance of modern engine, automatic transmission of automobile arises at the historic moment. It adopts different transmission ratio under different working conditions, so that the vehicle and engine can play a good dynamic performance under various working conditions. Therefore, regular maintenance and cleaning should be carried out during normal use to avoid maintenance incidents.