A
transmission technology that offers the convenience of an automatic transmission and the fuel [efficiency] of a manual transmission
Has made a substantial impAct in the automobile world
The technology [is] dual clutch transmission
Since it is as smooth as an automatic transmission and offers a better fuel efficiency than the latter dual clutch
Transmission has already taken a good market share
Dual clutch transmission is in fact two independent manual transmissions controlled by a computer
To understand how this arrangement offers the smoothness of an automatic transmission
Let's first explore the inner workings and the drawbacks of a regular manual transmission
This is a simplified manual transmission here the gears are always in mesh
You can see that the output gears are loosely connected to the shaft
Only one output gear will be connected with a shaft at a time
This means that the speed ratio will be the ratio of the connected gear
To facilitate this connection each gear is fitted with a synchronizer cone and teeth and the shaft is fitted with a hub
If the sleeve gets connected to the synchronizer teeth the corresponding gear will be connected to the shaft
But the sleeve and gear will be rotating at different speeds during the transmission operation
So it is impossible to achieve a connection at this stage. We have to achieve a speed match in order to facilitate the connection
The first step toward achieving a speed match is to disconnect the [power] flow to the transmission
For this purpose [a] set of clutch plates are used at the input side of the transmission
When these clutch plates are pressed together the frictional Force within them connects the engine input to the transmission
By disengaging the plates we can discontinue the power flow to the transmission
when there is no power flow to the transmission a
Synchronizer ring which has a friction cone will help to match the speed of the gear with the shaft
When the synchronizer ring is pressed against the cone of the gear the speed Match will occur
After the speed match the sleeve can easily slide and lock the shaft and gear together
This is a simple and [reliable] mechanism to achieve different gear ratios
However, it has a major drawback
Each time you shift the gear the power flow to the mechanism has to be
Discontinued by pressing a clutch pedal this means that for a short period of time [the] drive wheels will not get power
You can experience this sluggish acceleration while you shift the gears in a manual transmission car
One clever way to overcome this power shortage problem is to add one [more] manual transmission set with a separate clutch
You can see how the two connected to the input Via clutch packs
if you press the outer clutch pack the power will transmit to the red set
On the other hand if you press the inner clutch pack the power will transmit to the green set
The odd gears are connected to the green set and the even gear numbers are connected to the red set
Assume you [are] in third gear suppose you want to change to the fourth gear
In a dct the sleeve of the fourth Gear is connected in advance even when the third gear sleeve is already connected
this means that to move to the fourth gear what you have to do is simply, release the green clutch set and
engage the red clutch set
This pre selection of Gears guarantees a constant power flow even during the transition Phase
Thus you will get a smooth driving experience as if you are driving an automatic transmission vehicle
Depending on the driving conditions a transmission control module Determines which gear will be pre-selected
You can see that in all these gears the output rotates opposite the input
You can solve this [problem] with the help of a simple gear pair
To achieve reverse gear [a3] gear arrangement is used
Engaging the sleeve to the reverse gear will reverse the output rotation
unlike the regular manual transmission the reverse gear of the DCT has a
Synchronizer cone teeth arrangement this means that even if your vehicle is moving forward as long as the vehicle speed is low
You can still engage the reverse gear
This [is] not possible in a regular manual transmission
Before wrapping up the video. Let's have a look at a standard six-speed automatic transmission
It is clear that the DCT has fewer components, and is therefore lighter and less expensive
moreover an automatic transmission requires a torque converter which works Via fluid coupling
So whenever there [is] a speed difference between the input [and] output side
Slippage occurs and the torque converter generates heat this results in a low fuel efficiency
These kinds of problems do not occur in a dCT
In short the DCT is the best of both worlds
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