What's the difference between automatic transmission and power shift? What are their advantages and disadvantages?

1, automatic transmission

It consists of hydraulic torque converter, planetary gear and hydraulic control system, and realizes variable speed and torque through the combination of hydraulic transmission and gear. It can automatically change the speed and torque according to the road conditions, and the driver can concentrate on road traffic without the interference of gear shifting.

2. Two-speed clutch

DCT is a collection of two traditional manual gearboxes (odd and even gears respectively), with two clutches and two input shafts, but only one output shaft. Manual shift mode can also be provided.

Advantages of power shift:

1, fast shift powershift shift time is very short, even faster than manual shift, only 0.2 seconds.

2. Fuel-saving powershift can save a lot of fuel by eliminating torque interruption, so that the engine power can be directly utilized and always works in the best state.

Disadvantages of power shift:

1, cost: powershift has a complicated structure and high manufacturing process requirements, so the cost is also high, so we see that powershift is equipped with some mid-range models.

2. Torque problem Although powershift can definitely meet the requirements of ordinary vehicles, it is still sufficient for intense use.

3. Comfort problem Because the clutch combination of the dual-clutch gearbox is the same as that of the manual gearbox, it can avoid a slight setback in the shift process, but it is slightly lighter than the manual gearbox and will be accompanied by a slight shift combination sound.

Advantages of automatic transmission:

1, mature technology AT gearbox is the most widely used and popular gearbox in the market today, and its mature mechanical structure has also been inherited, developed and carried forward by various manufacturers.

2. Reliability The traditional hydraulic automatic transmission adopts hydraulic torque converter (or hydraulic coupler, disc clutch, etc.). ) to buffer the engine power impact, and the mechanical combination performance of planetary gears is stable and can bear torque. Even tanks use AT gearbox models.

Disadvantages of automatic transmission:

1, high transmission efficiency and high fuel consumption. Because the engine power needs to be transmitted to the gear set through the hydraulic torque converter (or plate clutch, etc.). ), the engine power will be wasted, so compared with manual gearbox (including CVT gearbox), AT gearbox will consume more oil.

2. Comfort. Because the AT gearbox still uses a fixed gear set, there will be frustration and noise when the vehicle shifts gears. AT gearbox is still not as smooth as CVT gearbox.

3. The structure is complicated and the manufacturing cost is slightly lower. AT gearbox needs more mechanical parts, which makes the overall weight bigger and the manufacturing cost higher than other types of gearboxes.