济南自动变速箱核心原理揭秘，换挡逻辑+类型解析一看就懂

　　The core principle of Jinan automatic transmission is revealed, and the shifting logic and type analysis are easy to understand at a glance

　　在济南汽车市场，随着2025年国产乘用车占比达57.14%、纯电渗透率突破28.94%，自动变速箱已成为绝大多数车辆的核心配置，但不少车主仍存在认知误区——认为自动变速箱与差速器作用相同，均是给发动机变速，甚至不清楚自动挡是否需要换挡。作为深耕汽车维修与科普领域的从业者，今天就结合济南本地市场现状，拆解济南自动变速箱的核心作用、工作原理及主流类型，用通俗且专业的表述，帮车主彻底搞懂自动变速箱，避开认知误区。

　　In the Jinan automobile market, with the domestic passenger car market accounting for 57.14% and pure electric penetration rate exceeding 28.94% by 2025, automatic transmission has become the core configuration of the vast majority of vehicles. However, many car owners still have misconceptions - they believe that automatic transmission and differential have the same function, both of which are to shift the engine, and they are even unclear whether automatic transmission needs to shift gears. As a practitioner deeply involved in the fields of automotive maintenance and science popularization, today we will combine the current situation of the local market in Jinan to dismantle the core role, working principle, and mainstream types of automatic transmissions in Jinan. Using simple and professional expressions, we will help car owners thoroughly understand automatic transmissions and avoid cognitive errors.

　　首先明确核心误区：自动变速箱与差速器作用并非一致，二者虽均依赖齿轮传动，但功能截然不同。差速器的核心作用是调节车辆转弯时左右车轮的转速差，避免转弯跑偏；而自动变速箱的核心功能有两个——改变发动机的转速和运行方向，通过调节转速实现车速控制，通过改变方向实现前进与倒车切换，这也是车辆能灵活调速、自由换向的核心原因。

　　Firstly, clarify the core misconception: automatic transmissions and differentials do not have the same function, and although both rely on gear transmission, their functions are completely different. The core function of the differential is to adjust the speed difference between the left and right wheels of the vehicle during turning, in order to avoid deviation during turning; The core functions of an automatic transmission are twofold - to change the engine speed and direction of operation, to control the vehicle speed by adjusting the speed, and to switch between forward and reverse by changing the direction. This is also the core reason why vehicles can flexibly adjust speed and freely change direction.

　　自动变速箱的变速原理，本质是通过不同大小的齿轮组合切换，改变传动比，进而调节转速。其核心逻辑与手动挡一致，均依靠“小齿轮驱动大齿轮减速、大齿轮驱动小齿轮加速”，只是换挡动作由电脑或机械装置自动完成。比如一档采用“小主动轮+大被动轮”组合，小齿轮转动4圈，被动轮仅转动1圈，实现大幅减速，适配起步、爬坡等低速高扭矩场景；二档则增大主动轮、减小被动轮，传动比发生变化，车速比一档提升15%-20%；以此类推，档位越高，主动轮与被动轮的尺寸差距越小，车速越快，其中五档多为直接档，发动机与传动轴直接连接，车速与发动机转速基本一致，是最快档位。

　　The shifting principle of an automatic transmission is essentially to switch through different sizes of gear combinations, change the transmission ratio, and then adjust the speed. Its core logic is consistent with manual transmission, relying on "small gears driving large gears for deceleration and large gears driving small gears for acceleration", except that the shifting action is automatically completed by a computer or mechanical device. For example, the first gear adopts a combination of "small driving wheel+large passive wheel", with the small gear rotating 4 turns and the passive wheel rotating only 1 turn, achieving significant deceleration and adapting to low-speed and high torque scenarios such as starting and climbing; In second gear, the driving wheel is increased and the passive wheel is decreased, resulting in a change in transmission ratio and a 15% -20% increase in vehicle speed compared to first gear; Similarly, the higher the gear, the smaller the size difference between the active and passive wheels, and the faster the vehicle speed. Among them, the fifth gear is mostly a direct gear, and the engine is directly connected to the transmission shaft. The speed and engine speed are basically the same, making it the fastest gear.

　　很多济南车主疑惑“自动挡到底要不要换挡”，答案是肯定的——所有变速箱都需要换挡，区别仅在于换挡方式。手动挡需车主手动拨动档位、踩离合切换；而自动挡只需将档位设置为前进（D档）或倒车（R档），其余换挡动作均由变速箱电脑自动完成，无需车主干预，这也是自动挡便捷性的核心体现。

　　Many car owners in Jinan are puzzled about whether automatic transmission should shift gears, and the answer is yes - all transmissions need to shift gears, the only difference being the shifting method. Manual transmission requires the owner to manually shift the gear and press the clutch to switch; The automatic transmission only requires setting the gear to forward (D gear) or reverse (R gear), and the rest of the shifting actions are automatically completed by the transmission computer without the intervention of the owner, which is also the core manifestation of the convenience of automatic transmission.

　　结合济南汽车市场主流车型，目前常见的自动变速箱主要有三类，工作原理各有不同。第一类是双离合变速箱（DCT），本质是在手动挡基础上加装自动换挡和离合装置，通过4个电机分别控制5个前进档和1个倒档，同时搭配电机控制离合器，由控制器统筹电机运行，实现自动换挡，适配多数家用轿车，在济南国产乘用车中占比不低。第二类是AT自动变速箱，通过制动器与离合器的配合工作，由电脑控制油路的接通与切断，实现档位切换，稳定性强，适配SUV、商用车等多种车型，济南货车等商用车中应用广泛。第三类是CVT变速箱，通过控制两个链轮的大小变化，实现无顿挫换挡，在济南进口车市场占比达20.2%，主打平顺性，适合城市通勤。

　　Based on the mainstream models in the Jinan automobile market, there are currently three common types of automatic transmissions with different working principles. The first type is dual clutch transmission (DCT), which essentially adds automatic shifting and clutch devices on the basis of manual transmission. It controls 5 forward gears and 1 reverse gear through 4 motors, and is equipped with a motor to control the clutch. The controller coordinates the operation of the motor to achieve automatic shifting, which is suitable for most family cars and accounts for a considerable proportion of domestic passenger cars in Jinan. The second type is the AT automatic transmission, which works in conjunction with the brake and clutch, and is controlled by the computer to switch gears. It has strong stability and is suitable for various vehicle models such as SUVs and commercial vehicles. It is widely used in commercial vehicles such as Jinan trucks. The third type is CVT gearbox, which achieves seamless shifting by controlling the size changes of two sprockets. It accounts for 20.2% of the imported car market in Jinan and focuses on smoothness, suitable for urban commuting.

　　倒车档的工作原理也十分简单，与前进档相比，仅增加了一组反向齿轮，切换倒档时，齿轮传动方向改变，传动轴运行方向与发动机相反，进而带动轮胎反向转动，实现倒车。值得注意的是，自动变速箱的换挡逻辑与车速、发动机转速精准匹配，比如起步时自动切换至一档，车速提升后逐步升档，减速时自动降档，既保证动力输出，又兼顾燃油经济性。

　　The working principle of reverse gear is also very simple. Compared with forward gear, it only adds a set of reverse gears. When switching reverse gear, the direction of gear transmission changes, and the running direction of the transmission shaft is opposite to the engine, which in turn drives the tires to rotate in the opposite direction, achieving reverse. It is worth noting that the shifting logic of an automatic transmission is precisely matched with the vehicle speed and engine speed. For example, it automatically switches to first gear when starting, gradually upshifts as the vehicle speed increases, and automatically downshifts when decelerating, ensuring both power output and fuel economy.

　　随着济南汽车市场向多元化动力转型，自动变速箱的应用愈发广泛，其性能直接影响车辆的驾驶体验、动力输出和使用寿命。厘清自动变速箱的核心原理与认知误区，不仅能帮助济南车主更好地操作车辆、延长变速箱使用寿命，也能在车辆维修保养时更具针对性，避免被误导。未来，随着新能源汽车的普及，自动变速箱技术也将持续迭代，进一步适配济南车主的驾驶需求，为车主带来更便捷、平顺的驾驶体验。

　　With the diversified power transformation of Jinan's automobile market, the application of automatic transmissions is becoming increasingly widespread, and their performance directly affects the driving experience, power output, and service life of vehicles. Clarifying the core principles and cognitive misconceptions of automatic transmissions can not only help Jinan car owners better operate their vehicles and extend the service life of their transmissions, but also provide more targeted maintenance and repair services to avoid being misled. In the future, with the popularization of new energy vehicles, automatic transmission technology will continue to iterate, further adapting to the driving needs of Jinan car owners and bringing them a more convenient and smooth driving experience.

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