Automotive automatic transmission classification.

(1) According To The Structure Of The Gear Shifting Mechanism, The Automatic Transmission Can Be Divided Into Planetary Gear Type And Parallel Shaft Type.

① Planetary Gear Automatic Transmission

Planetary gear transmission is adopted, and gear shift is realized by shifting actuator. It has the characteristics of compact structure and small volume, which is the structure adopted by most cars at present.

② Parallel Shaft Automatic Transmission

Adopt common gear meshing transmission, change the collocation of different gears through shifting clutch, realize the change of gear position (transmission ratio). Guangzhou Honda Accord adopts parallel shaft automatic transmission.

(2) According To The Layout Of Automatic Transmission, Automatic Transmission Can Be Divided Into Front Front Drive Type And Front Rear Drive Type Two.

① The front front drive type is used in the engine front front wheel drive transmission system, automatic transmission and drive axle are integrated, so it is also called automatic variable drive axle.

② The front and rear drive type is used in the engine front and rear wheel drive transmission system, automatic transmission and drive axle are independent, so it is called automatic transmission.

(3) According To Different Shift Control Methods, Automatic Transmission Can Be Divided Into Hydraulic Automatic Transmission And Electronic Automatic Transmission Two Kinds.

① Hydraulic automatic transmission through mechanical means to throttle opening and vehicle speed into hydraulic control signals, the valve body of the regulator in accordance with the set shift law to control the action of the shifting actuator, automatic shift.

② Electronic control automatic transmission through a variety of sensor, engine speed, throttle opening, speed, engine temperature, automatic transmission hydraulic oil temperature into electrical signals, such as input, electronic control unit (ECU) for automatic transmission ECU according to these electrical signals to calculate the shift gear shift control signal and input the corresponding electromagnetic valve, by shift solenoid valve control shift actuator movement, the implementation Automatic shift.

(4) According To Whether The Transmission Ratio Changes Continuously, Automatic Transmission Is Divided Into Two Kinds Of Stepless And Stepless.

① The transmission ratio of each gear of the graded automatic transmission is a fixed value, and the transmission ratio between each gear is discontinuous. The planetary gear automatic transmission and parallel shaft automatic transmission are all graded automatic transmissions.
② Stepless automatic transmission can achieve the transmission ratio of the whole range of continuous transformation, that is, the transformation of the transmission ratio is uninterrupted. At present, the use of steel belt or chain transmission, by changing the working radius of the main and driven pulley to change the transmission ratio of automatic transmission is a stepless automatic transmission.

DSG Dual Clutch Automatic Transmission: DSG stands for Direct-shift Gearbox, and Volkswagen has named it a dual clutch Gearbox based on how it works. At present, Audi, Golf, Bora, Touran, Passat, Magotan, Sagitar and so on have dual clutch configuration models.

The DSG is different from other semi-automatic transmission systems in that it provides uninterrupted power output in addition to the flexibility of a manual transmission and the comfort of an automatic transmission, which is completely different from two automatic control clutches. A traditional manual transmission uses a clutch. When shifting gears, the driver must press down on the clutch pedal to engage the gears in different gears, and the power is interrupted during the shift, making the output performance intermittent. The DSG developed for this problem can be regarded as combining the functions of two manual transmissions into one, and established in a single system. The DSG contains two self-controlled clutches, which are electronically controlled and hydraulically driven to simultaneously control the operation of both sets of clutches. When the transmission is running, one set of gears is engaged, and when the gear shift is approaching, the next set of gears has been pre-selected, but the clutch is still detached. When shifting, one clutch separates the gears in use, while the other clutch engages the pre-selected gears, ensuring that at least one set of gears is producing power during the whole shift, so that there is no power interruption.
To support the above operation, the DSG drive shaft is divided into two parts, one is placed in the inner solid drive shaft, and the other is hollow drive shaft outside; The inner solid drive shaft is connected to 1, 3, 5 and reverse gear, while the outer hollow drive shaft is connected to 2, 4 and 6 gear. The two clutches are responsible for the meshing action of one drive shaft, and the engine power will be transmitted uninterrupted by one of the drive shafts.