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What is the working principle of a dual-clutch automatic transmission?

2 Answers

StVincent

08/26/25 4:14am

Dual-clutch automatic transmission is based on the foundation of a manual transmission. Unlike a manual transmission, the DCT has two clutches connected to two input shafts, and gear shifting and clutch operations are achieved through an integrated mechatronic module of electronic and hydraulic components. Below is an introduction to the DCT dual-clutch automatic transmission: 1. Composition: It has two clutches. One clutch is connected to the driving gears of the odd-numbered gears (e.g., 1st, 3rd, 5th gears), and the other clutch is connected to the driving gears of the even-numbered gears (e.g., 2nd, 4th, 6th gears). Both gear shifting and clutch operations are performed by electric actuators and controlled by a computer. 2. Function: For a dual-clutch automatic transmission, if the ECU determines the need to shift from 1st gear to 2nd gear, the ECU controls the actuators to engage 2nd gear (at this time, the clutch connected to the 2nd gear driving shaft is not engaged) before disengaging 1st gear. Then, the clutch connected to the 1st gear driving shaft is disengaged, and the clutch connected to the 2nd gear driving shaft is engaged, followed by disengaging 1st gear to complete the automatic shifting process. Due to the use of dual clutches, the operation of the clutches is simpler, and gear shifting is faster.

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ArcherFitz

09/08/25 5:25am

Driving a dual-clutch transmission car is like having two assistants helping you operate. I've driven this type of transmission for five years, and it feels particularly smooth when overtaking in daily driving. At its core are two clutches and two input shafts, one managing odd-numbered gears and the other even-numbered gears. For example, when you're driving in first gear, the second gear's teeth are already pre-engaged. When it's time to shift gears, you just need to quickly switch the clutch. This way, power delivery is almost uninterrupted, and throttle response is quick, especially noticeable on highways. However, in traffic jams, low-speed following can occasionally cause slight jerks, though newer models have improved this significantly. This design is also more fuel-efficient than traditional automatic transmissions, with maintenance costs not being too high, making it very practical for urban commuting.

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