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，需要保持汽车自动变速箱的传动比，以扩大驱动轮的扭矩和速度的更自然的变化范围，从而满足各种行驶条件下不断变化的需求。在不改变汽车发动机工作方向的情况下，汽车可以在反向行驶中良好地行驶。

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，当我们处于空档时，如果需要中断电源以传输能量，以便发动机可以正常启动和怠速，并且变速箱在换档或执行时可以输出动力。

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.

由于现代发动机不成熟的性能，汽车自动变速箱应运而生。它在不同的工况下采用不同的传动比，使车辆和发动机在各种工况下都能发挥良好的动态性能。因此，在正常使用期间，应定期维护和清洁，以免发生维修事件。

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.