Why does the dual clutch gearbox have a setback at low speed?

1, there is a big difference in the low gear ratio of the gearbox: anyone who has driven a manual gearbox knows that when the engine speed is high, there will be some frustration from the first gear to the second gear, which is caused by the big change in the gear ratio of the gearbox. For the automatic gearbox, the shift setback is relatively small because of the buffer of the hydraulic torque converter, while the dual-clutch gearbox has no buffer of the hydraulic torque converter, so this setback can only be alleviated by extending the semi-linkage state of the two groups of clutches.

2. Limited by the mechanical structure of the dual clutch, the shift logic leads to: limited by the mechanical structure and principle of the dual clutch, the dual clutch must have two gears at the same time, one is the power output gear and the other is the gear to be switched. The upshift speed of the dual clutch is very fast, and the downshift speed of the dual clutch is relatively slow.

Extended data:

Skills of using dual clutch gearbox;

1, dual clutch In traffic jam environment, manual mode can reduce shift times, friction and heat generation, especially dry dual clutch, which is more meaningful. Of course, this will lead to an increase in fuel consumption.

2. Braking plays an important role in the dual clutch gearbox. Dual clutch gearbox has no torque converter, and can only judge and control the combination and separation of clutch plates through braking signals to realize the interruption and connection of power. Frequent braking means that the clutch is in a semi-linkage state for a long time. Therefore, it is helpful to reduce the temperature of the gearbox by using the throttle and engine resistance to automatically control the speed when driving in the city.

3. The dual clutch gearbox uses clutch plates. To combine and separate the power, because the clutch needs to be semi-linked to eliminate the speed difference when it is combined, don't engage when it is engaged in D gear, accelerate immediately, wait for one second, and then refuel and speed up after the servo mechanism controls the power to be connected and output.

References:

Baidu encyclopedia dual clutch gearbox