1.Reliable and durable automatic transmission(AT)

Working principle: Power transmission through hydraulic torque changer, and relying on planetary gear sets to achieve different gear switching, complex and precise structure.

Advantages:

• High reliability: mature technology, global popularity for decades, perfect maintenance system, low probability of failure.

• Strong torque bearing: It can withstand the high torque output of a high-horsepower engine and is often used in hardcore off-road and performance vehicles.

• Good driving experience: There is a slight sense of jerkiness when changing gears, but it allows the driver to perceive the change of power, and the sense of control is more direct.

• Strong adaptability: In complex road conditions such as steep slopes and muddy slopes, the gear can be manually locked to avoid slipping, with excellent stability.

Disadvantages:

• Low transmission efficiency: The hydraulic torque reducer has power loss and relatively high fuel consumption.

• High cost: The complex structure leads to high manufacturing costs and high maintenance costs.

• Slow response speed: Compared with the double clutch, the downshift speed is slower, and there is a delay in rapid acceleration.

2.Smooth and fuel-saving stepless gearbox(CVT)

Working principle: There is no traditional gear, and the transmission ratio is continuously changed through two sets of variable-diameter pulleys and steel belts (or chains).

Advantages:

• Extremely smooth: no gear switching, the driving process is very smooth, especially suitable for urban traffic jams.

•Good fuel economy: It can keep the engine in the best speed range at all times, and the fuel-saving effect is remarkable.

• Low noise: smooth operation, quietness in the car is better than other gearboxes.

• Low cost: the structure is relatively simple, and the later maintenance cost is affordable.

Disadvantages:

• Weak power: lack of explosive power, "dry roaring without leaving" when accelerating rapidly, and lack of driving passion.

• Steel belts are easy to wear: high-load driving (such as intense driving and frequent climbing) may cause the steel belt to slip and shorten the service life.

• Plain driving feeling: without gear switching, you can't experience the fun of shifting.

3.High-efficiency and fast dual-clutch transmission(DCT)

Working principle: Two sets of clutches control odd and even gears respectively, and achieve seamless gear shifting through quick switching.

Advantages:

• Fast gear shifting speed: millisecond gear shift response, smooth power connection, and excellent acceleration performance.

• High transmission efficiency: close to the efficiency of manual transmission, and the fuel consumption performance is better than that of AT gearbox.

• Driving fun: manual mode can be freely raised and lowered, suitable for car owners who pursue a sense of control.

Disadvantages:

• Low-speed stuttering: Under the congested road conditions of walking and stopping, frequent clutch switching is easy to produce a sense of stuttering.

• Heat dissipation problems: Intense driving or long-term high-load operation, the clutch is prone to overheating, resulting in performance decline or even failure.

 • High maintenance cost: the mechanical and electrical control unit and clutch are precise in structure, and the maintenance is difficult and expensive.

So How to choose a gearbox that suits you?

1. Household walking: CVT is preferred, smooth and fuel-saving, worry-free in the later stage, suitable for urban commuting.

2. Pursuit of performance: DCT is the best choice, with fast gear shifting, strong power, and fuel consumption.

3. Complex road conditions or sufficient budget: AT gearbox is highly reliable and can cope with various extreme environments, suitable for off-road or high-end models.

4. Driving habits: choose DCT if you like intense driving, choose CVT if you want to pursue comfort and stability, and consider AT if you want to balance the experience.

After reading this article, do you feel a deeper understanding of these types of gearboxes? Next time, we will continue to discuss the knowledge of other cars.

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