Working of Dual Clutch Transmission (DSG)

[@BboyRagnar0us]

I swear transmissions are the hardest car component to understand! I've watched all engineering videos that explain it yet it is the only thing I fail to comprehend!

[@Allancastro90]

Makes two of us

[@markg7030]

Keep watching different videos including some that use real transmission parts. The automatic trans is the most difficult to understand. I just learned something on this video, the dual clutch type trans may use more gas because the engine is spinning shafts and gears in 2 transmissions.

[@elr2141979]

there's only one thing you need to understand it works.

[@GReaper]

elr2141979 It allows your engine to move your car.... But how? lol

[@ripbozolol1]

the only one im still trying to get is automatic but im all good on the rest☺

[@mgray2418]

Honestly the minds behind this stuff!

[@nwabuezeozuzu6370]

The inventors and the animators are awesome!

[@farid-cant-take-it-anymore]

Don't tell me... just Àwè§ømē

[@strygwr]

its all trial n error

[@IvanIvanov-uw4yx]

believe me or not, I'm not a car guy and i was theorizing why don't they use something like that in cars already with a friend of mine, and he brought me here. I literally invented something that already exists.

[@supersabrosinho]

I'm a design engineer for a 2nd tier auto supplier. Believe it or not, the minds behind this stuff are regular minds like yours! Anyone can do this. Realize that the fundamental physics that these transmissions are based on were invented 100 years ago! It took thousands of people, many years, and many failures to get to this final design

[@SabinCivil]

Dear friends, 3 months back we had decided to stop our video production service after the release of Transistor video. Patreon was our last resort to save LE channel. We got an amazing response from our viewers in such a short period of time and you saved this channel. In fact without your support, this video would not have released. Let's hope that we will have the resources to release 2 videos/month soon. www.patreon.com/LearnEngineering

[@evoegtlen]

Extremely intuitive! I am always looking forward to your videos. Will definitely be contributing to this channels growth - keep it up. Thank you!

[@SabinCivil]

Thank you for your support !

[@ahmadissa8663]

شكرا لك جميل جدا

[@anasnasihin3346]

keep it up, i love your video

[@1001speedster]

Keep it up you guys!! Love your videos!!!

[@dennisneo1608]

I can watch all day and still not understand how this is possible

[@supersabrosinho]

Lol. It's essentially two transmissions alternating power duty. If you've ever seen those old school lumberjacks alternating their saw cuts it's kind of like that

[@АлакПатрова]

Remember that when you take you car to the shop.

[@nwabuezeozuzu6370]

These animations really help with understanding how vehicle transmission works.

[@SpaceMissile]

they are some top-tier animations.

[@synthwave7]

The best animation - Just purchased a new VW Polo DSG car and wow - the DSG is super smooth - I doubt I will ever go back to a normal automatic gearbox.

[@richardslav9282]

,,Even if your vehicle is moving forward, as long as the vehicle speed is low, you can still engage the reverse gear” *shifts from 5th gear directly to reverse*

[@xxoan.1613]

brakes? never heard of 'em

[@karlmdennis]

The mechanic told me it was a three hour job to remove the gearbox, I guess I showed him!

[@andrikharismawibawa4245]

R is not Reverse R hear is Racing Gear

[@Akotski-ys9rr]

I need to try this in my car at low speed of course

[@richardslav9282]

@@Akotski-ys9rr let us know after how it turned out

[@SabinCivil]

Dear friends, DCTs (DSG) technology is a promising technology( up from 3.4% to 8.5% market share in the last 5 years). We thank our patrons for suggesting this topic. We thank our current patrons for saving LE from death. To achieve our goal of 2 video release/ month (addition of one more team member), please support us at Patreon. www.patreon.com/LearnEngineering

[@evoegtlen]

Keeping with the theme of automobiles, could you do an episode on vibrations of spring/damper combination? Another suggestion - photovoltaics?

[@SabinCivil]

Was the first suggestion same as automobile suspension ? We will definitely make a video on PV cells. However it will take sometime.

[@TransTaey]

Having rented a Hyundai Veloster which has DCT, I can say I thoroughly enjoyed having that tech.

[@jesusf.2600]

graciousAnomaly Did the way you drive from a regular Automatic have to get altered 8n any way? Thanks.

[@ΑΡΗΣΚΟΡΝΑΡΑΚΗΣ]

Learn Engineering Valvetronic on the next video please

[@goata007]

Had this in my 5-series, best transmission ever...gear changes are instantaneous and acceleration is amazing.

[@Has7DCT]

5-series has a DCT? You mean M5?

[@goata007]

@@Has7DCT yes G30 5-series has 7-speed DSG (dual clutch transmission)

[@Has7DCT]

@@goata007 hell no I thought they were only ZF 8-speed torque converter ?? The only 5er I know with the DCT was the F10 M5. Something's off here

[@goata007]

@@Has7DCT You’re right, its ZF 8-speed auto, somehow i got it mixed up. But it changes gears so fast in sport mode, feels like DCT

[@Has7DCT]

@@goata007 can definitely agree with that. These ZF's are catching up with the DCT's lightning quick shifts but also silky smooth at low speeds (doesn't jerk like a DCT at all)

[@MrBitemeidareya]

With Skills USA coming up for my auto program I have been watching these videos to try to understand what I don't understand so that I can do well and it really helps, great job in every video

[@SethCocker05]

I love the roughness of being in a manual transmission car. Feeling the sudden lurch forwards as the clutch is pressed and power to the wheels is lost, and I think moving the gear stick around is a lot more fun than just pressing a paddle. Though practicality wise this dct is better.

[@MrTayfunsuren]

Thats you ..but for most people cars are just a tool for transportation and noting more.

[@Payayaso]

@@MrTayfunsuren nah there's alot of people who think the same as him goofy

[@ItzzShazey]

@@MrTayfunsuren seems like you are just a boring person. And gonna disappoint the wife when you have to take your oil in to get it changed!

[@ashjose7973]

@@Payayaso that's me

[@ashjose7973]

@@MrTayfunsuren if the roads aren't the best and you have different types of situations, manual works best

[@MidtownMeezus]

This is why I thank god that humans made cars, it’s not all materialistic....they’re works of art

[@FlumenSanctiViti]

Videos from this channel are probably the best on YT to visually explain how transmissions work. Kudos!

[@Ghandara-hg1gc]

Thank you for making this video. After watching it 4 times, I think I understand how this works completely now.

[@wvsky]

Excellent. I purchased a new Kona and it has this transmission that I had never heard of before. Now I know at least a little more about it.

[@MrBiky]

I cannot leave without pressing that appreciation button. The video about automatic transmission was over my head, but DCT seems awesome (and it is !). Thanks for the explanation.

[@MrBiky]

Although not as great as an 1 gear electric car transmission (Tesla)

[@demosteneneacsiu6144]

Best explanation of a dct I've seen, keep it up!

[@omialmanza1900]

Honesty dont care about speed or fuel economy i'll always drive a manual👍just for the feeling of being in full control and fun not just driving.

[@daniellentz4335]

Both of these transmissions are manual... That last bit is only a comparison of cons of automatic and benefits of DCT, but everything else is comparing regular manual to DCT manual.

[@omialmanza1900]

@@daniellentz4335 true, 👍was just my opinion.

[@АлакПатрова]

Manuals are gods gearbox

[@Mark-hu9tf]

Had a DSG on an Audi TT mk 1 3.2 and loved it.

[@staninjapan07]

That's a great video. Concise but with as much info as necessary to understand the idea. Good animation and not too much technical jargon. Thank you.

[@Pingu65716]

People are so needy to want a constant power flow for smoothest possible transition of gears. You are operating a miracle of a machine.. You must feel the cogs shift and appreciate the power and control it holds

[@GamingWithNikolas]

Oh you must feel so hard right now being so much better than every one else for using another pedal.

[@aronpanrucker3155]

legit the best video i have ever seen on explaining and showing how gearboxes work ( before watching this i had a simple understanding of how each type worked but after watching this i have a much deeper understanding of how it all works

[@shelory]

Wow, for the first time I think I understand how the transmission works! I've tried to understand but never quite got it until now, thanks!

[@CopperKettle]

Thank you for creating this explanation. Cheers from Russia

[@davevil7573]

Another benefit of dsg transmissions is that if you have turbo, the turbo holds through the shift rather than in an automatic, it cuts off at each shift, making for smoother and faster shifts and acceleration

[@stuartcareless9550]

@Gibbon what do you think on these on the VW transporters stay away or buy with dsg ????

[@JboDaJuiceman]

Dave Vil automatics hold boost through shifts. You’re thinking manual trans don’t hold boost cause you let off the gas to change gears

[@jansteen5640]

@@JboDaJuiceman Not saying this is normal but in theory you can shift your manual while foot to the floor on the gas.

[@ipo7596]

I'm sorry bro I don't follow. Can you explain further? If my understanding is right based on your comment, basically turbos do not drop and spool again after each shift? Is that what I think it is? No lag? Anti-lag? Correct me if I'm wrong please I wanna understand.

[@ijustwant2lookatvids]

Manual transmissions lose boost on gear changes. Automatics, DCT, or torque converter equipped ones do not. With a manual transmission you let off the accelerator, and wait for the R.P.M. to drop before engaging the next gear when accelerating.

[@zaneverovati]

The DSG on my Skoda Octavia 1.6 TDI is all I ever wanted. Press the gas pedal and hold it at a completely even level and enjoy the acceleration. BUTTERSMOOTH

[@veritas1073]

Now I know why manual transmissions are the best! Thank you!

[@-j.r9967]

Because you need 2 of them to be better than a normal automatic?

[@geralt36]

@@-j.r9967 No, because manuals give you more control over your car's acceleration, i.e., you get to choose your gear and thus, be in the right gear at the right time. And they are more engaging and fun to drive.

[@-j.r9967]

@Geralt most cars let you select your gear the same way. My beater from 02 has it even. Same amount of control. I get the engaging thing but I have just as much fun in autos as I do manuals lol

[@-j.r9967]

@@geralt36 I mean all in all it's all opinion anyways, but there's a reason manual transmissions are going extinct lol

[@geralt36]

@@-j.r9967 Going extinct you say. Is that why Toyota is coming out with its new GR Corolla which is only available in manual? Toyota also made the supra which previously only came with a DCT available in a manual for 2023. Then there's other only manual cars like Civic Type R, Civic SI, etc. Lexus is also working on an EV that's going to have a manual trans. Why do you think these car manufacturers are making manuals? Because there's demand for them and people want to keep them alive. As long as there's a demand they will keep making them. No matter how niche the market is.

[@Backtrack3332]

Simpler than I thought. Thank you for the video.

[@dagaspar6]

The ingenuity of this is amazing!

[@wallebo]

Excellently explained. It makes it appear very logical for sure.

[@viraj203]

Complex mechanism explained in such a simplified manner ..amazing experience for newbies to understand

[@ridehead8771]

Both of my cars have DSG, one being 10 years old and I've never had a single issue. Both cars deliver great mpg and still smooth as ever. People who diss DSG are rather ignorant, believe me this is the best transmission ever

[@electrosec]

Dry or wet

[@ridehead8771]

@@electrosec Twin plate dry 6 speed diesel and dry 7 speed petrol. Diesel one is 10 years old, petrol is 7 years old.

[@WatsitTooyah]

Hyundai ioniq hybrid uses a DCT or DSG same thing. Very interesting with gas+ electric power and paddle shifters

[@MD-wq6on]

I still like the good old stick shift (manual) transmissions best. I could care less about smoothness of shifting, or that one more mile per gallon you might be able to achieve with a DCT. Fact remains for me is that I have driven many different cars in my life and have never had any problems with a manual trans., nor have I ever had to replace a clutch. The most miles I have driven in a manual has been almost 200K with not the hint of a problem in a stick. Automatics a completely different story.

[@russcattell955i]

I agree Michael, in my more than 40 years on the road with everything from bikes to 44t trucks, I have had 3 clutches changed, I put a new pack in my rally car when built, had to do 1 change in 4 years of competition. Then 1 in a road car because my mechanic (brother) had a unwanted (free) pack on the shelf. My wife had 1 change on her Ford because in it's early life was a city car & most likely a clutch riding owner. I have no idea the cost of a DSG clutch pack replacement, but I suspect it beats any laxative.

[@jesusf.2600]

Michael Duke Dude my 3 Hondas are all Automatics and they range in milage between 184-236,000+ miles.

[@harrygujral87]

excellent explanation for the DCT. Graphics used clear all your doubts related to the concept.

[@Mago84013]

This man needs to be the voice of an AI, GPS, or something.

[@DzekoTV401]

Got DSG in my 2019Golf R and it shifts fast and smooth just love it 😊

[@Mo.Jo.]

Loving my acura/honda designed 8 speed DCT with torque converter. I've had regular automatic and cvt in the past and they've been fine. Next up I plan to get my very first manual in a year.

[@Leandro7470]

Did you got the manual? I learned on manual trannnies, have driven regular torque converter automatics that you can kinda select your gear by how much you press the pedal, I just got a dual clutch auto and i DO miss manuals, until the computer realize what i want from it i could have just downshifted, reved it up and had instant power on a lower gear or skiped a gear or two if i had enough speed to just keep it rolling, cant really do that OR I have to get used to the car behavior

[@АлакПатрова]

Manual is gods gearbox

[@parthasarathikhamaru731]

Great !!! 👌👌👌 Thank you the entire team.

[@Bassotronics]

I totally understand a manual transmission but once the second one was introduced in conjunction with the first one, I totally lost it. Damn that's alot of gears!

[@hackleberrym]

Then go and watch a video on automatic transmision. it's totally mindblowing. (at least for me)

[@joevignolor4u949]

It's basically two standard transmissions with two clutches running in parallel and connected to the same differential that drive the front wheels.

[@franciscovessani6720]

The first one can run loose if red clutch is released and green pressed. And vice versa

[@HelloKittyFanMan..]

Well, Mical, a video of a planetary automatic, vs. this kind of automatic.

[@mvmcali6900]

I think its important to see that there are 2 concentric shafts (on top). either one or the other gets power from the engine (left side) depending on which of the 2 clutch plates is engages (you can see them as left and right on the top left of the animation

[@sanjaysinghbisht2556]

your videos are very descriptive... very easy to understand along with the animation...

[@zpetar]

DCT works great in performance vehicles where its easy to predict for computer which gear is next. When you hit full throttle computer expects next gear will be up shift, when you hit breaks computer expects next gear will be down shift. But for every day use it is horrible. There is no way for computer to predict next gear in crowded streets or in traffic jam when cars are crawling.

[@scottunger8585]

The DCT used in the Ford Focus and Fiesta appears to be a poor design. Many law suits resulted , I had a Focus, it was reprogrammed several times in the three years I owned it. It was a very poor shifting car in the daily stop and go seemingly it could not determine how to compensate for short stop and go situations. There is a class action against it now, happy to be rid of the Focus, some days the program would crash and the car wouldn’t move.

[@Noobletti]

I dont know what car you have driven, but the ones i have, i dont feel the shifts at anypoint. Not in higway or in traffic.

[@jacintarene_]

1st to 2nd is the most obvious change by far, but from 2 onwards they becoming exponentially less noticeable in terms of changing gears. But yeah In crawling speed traffic it gets a little confused on whether you’re going up a gear or down, but I’ve learned to find the sweet spot in 2nd or in 3rd to keep it steady. If you can’t drive with a consistent speed and you keep having to brake then you’re gunna have a jerky drive. Learn to crawl at a constant speed

[@johnbailey8103]

this channel mostly teaches me that I know almost nothing

[@OatmealDonk]

I thought you were talking about a girl when you said "saving Ellie from death"... not "LE". :-P

[@Xilver_]

James Ray lmao that's what I heard

[@Chris-wj4ze]

omg

[@gusfringonlyfans]

me too

[@MattJesuele]

lmao yep

[@downey2294]

i was reading the subtitles and it does say "Ellie" instead of "LE" only realized it was meant to be LE by reading your comment.

[@Mrbfgray]

Excellent explanation of something I have long wondered about, simpler than I imagined.

[@BaNuj]

Humans have incredible sense and imagination. Great!

[@shantanumelkote4043]

A dual-clutch transmission is a dream come true. In other words, a DCT is a DCT.

[@laughy38247357075834]

very clever design.

[@anandkvinu2832]

thanks LE team.. i clearly understood the DCT... no doubts at all.... thanks

[@jona8537]

Still confused

[@WszystkoZajeteOMG409]

We all are. Would need physical model. The most I understood is that you have two gears ready at same time. One clutch does even gears, second one odd ones. So prob one spins in the "air or free" and other takes full load. Not sure about how they swap

[@ピロシキ-n7o]

This video help me for understanding my VW golf’s dsg. Thanks for sharing this video👍👍 👍

[@Anaerin]

I know there were some companies (Citroen, for instance) that had a semi-automatic gearbox - It was a manual box with a torque converter.

[@Sparkles1290]

does anyone know why can't automatics just be a torque converter next to a normal manual thing but the gears are changed by a robot?

[@rayoflight62]

You're right. A simple hydraulic actuator could replace stock shifting. The automotive industry is the one of most resistant to change. Tesla cars had a 12 V lead acid battery to power all the accessories until few years ago. Allison's has the de facto Monopoly in automatic transmissions, Bosch its own on ABS brakes, you can have your own if you design, build and patent a stick-shifter.

[@SpaceMissile]

this is a _fantastic_ video. very well-explained and in just over 6 minutes, too.

[@igorperfeitovivo]

Awesome video! Thanks for making this great content for us!

[@timothysinclair3670]

Beautifully clear video!

[@ToastyClam]

Do one on a sequential gearbox!

[@raw_pc]

I loved DSG in my 2004 Audi A3 3.2 V6 Quattro. It was smooth as a butter and decently fast.

[@numbatkeller]

DSG stands for Direktschaltgetriebe which is german for "direct shift transmission".

[@tankpenguin175]

numbatkeller Ich dachte es heißt Doppelschaltgetriebe

[@yeongvinsheng7639]

It's direct shift gearbox

[@V4YGR3]

7 speed wasnt a succes... but why...

[@vindieu]

this video is fantastic. understood everything very clearly now. thanks

[@Eric_D_6]

Smooth, must be talking about them rich man autos

[@Bunnysinger]

No, DCT's can be found in cheaper cars nowadays.

[@Eric_D_6]

Wladyslaw Szpilman read the first word

[@doodskie999]

hyundai accent and some kia models, ford ecosport and ford fiesta and many more

[@Eric_D_6]

doodskie999 I'm pretty sure those are all CVT or even conventioanl auto, not DCT. Of course CVT are smooth and the tourque converter can smooth out a lot of the conventional but the cheap DCTs don't tend to be smooth at all.

[@Bunnysinger]

Eric D I've driven an A3 with DCT and it's pretty smooth...

[@eaglezyb]

Thank you for making this excellent videos... it helped a lot!!!

[@RageUnchained]

DCTs have their own problems look at the 2015-17 ford fiesta. Ford didnt put any vents in the bellhousing and so the damn clutch plates get so hot that firstly it feels like driving with a student driver in a manual trans, and secondly the plates tend to overheat and burn up every 30k because the lack of venting or air cooling for the bell housings

[@awlonghurst]

Mines got 44K and it's fine. I think it's unlikely that VW would get away with selling millions of cars that needed new clutches at 33K. The DQ200 transmission in my car has an overheat warning and will shutdown the engine if necessary. It never has and I've never seen the warning light lit. DCTs can overheat if allowed to creep at slow speeds as if one was driving a torque converter automatic transmission, because it's basically continuously slipping the clutch, which overheats the friction material. It's worth avoiding doing that, just the same as one would in a manual transmission. I think this might be some of the reason for the lack of popularity of DCTs in the US and in fact I heard that Audi stopped selling them there as customers preferred torque converter autos. Automatic transmissions are much less common this side of the pond so drivers are less like to treat DCT gearboxes like torque converter transmissions and thus possibly less likely to encounter this issue with overheating.

[@skyportal]

2012 and up, but exactly!! focus and fiesta. transmission shudder!!

[@789pokey]

Yes, that Ford auto is a disgrace.

[@karlpatricke.castillo942]

The second one was allision transmission that uses planetary gears this was a great invention and the man behind it was very genius, you will ba amaze of the mechanism and it will blown your mind. But this DCT mechanism removes all the complicated stuff in allision transmission it is the combination of manual transmissions and allision transmission mechanism. What a brilliant mind.

[@cthulhu674]

could you make a video explaining common transmission failures ie. overgeating, slipping ect. thank you.

[@zongyang4707]

this is alot to learn how the dct trans work...!! If i ever have to repair one IM sending it off to a specialist..!

[@HiddenWindshield]

I've noticed an error in this video. You say that normal manual transmissions never have synchronizers on the reverse gear. This is not true, some of them do. I know this because I happen to own a manual-transmission car with a synchronized reverse. You also say that all DCTs *do* have a synchronized reverse, but that's not necessarily true, as DCTs can operate without it just as well as a regular manual transmission.

[@basss62]

Best animation! Montréal, Québec

[@3rdGenGuy]

DCTs biggest issue is low speed clunkiness and overall cost. but oh man at WOT they shift fast.

[@matttl903]

@WalkinOSF the car will be pretty jerky in stop and go traffic, mostly due to clutch slip and engine braking

[@ganewatthe]

A very good video explaining DCT. Thank you.

[@flylikealbatross7441]

Lol. BMW with FWD :D But the rest of the video is very nice!

[@farid-cant-take-it-anymore]

Thanks for the video. Now DCT is clear to me :)

[@RenaxTM91]

"Best transmission ever" Well, depends where you're coming from and what you want your car to do. In my experience normal oldscool manuals with a cluch is cheap, reliable, economical, cheap and simple to fix if they do break. and the only negatives is that you have to learn a skill, and 1sec powerloss while shifting. Upside is that when you do learn the skill of driving a manual you have more control. At the cost of using your left leg sometimes, and moving a lever... I've had people tell me that a cluch change is expensive and you never have to do that in a automatic car. But a cluch that isn't abused lasts longer than most cars today, so I don't worry much about it...

[@Off3er]

Renax the Man manual all the way!

[@789pokey]

Renax, there is no powerloss on shifts if you "power shift". You don't let off the gas and you just brush the clutch pedal enough to force the transmission in to the next gear while the clutch is never fully released.

[@RenaxTM91]

@@789pokey well, there is still a powerloss, but if you abuse the gearbox (or have a expensive racing gearbox) it can be less than a second...

[@789pokey]

@@RenaxTM91, a second is an eternity in a drag race. At an average speed of 60mph, you're covering 88 feet per second.

[@RenaxTM91]

@@789pokey Yea, in a dragrace you want the "expensive racing gearbox" option. For a normal daily driver a second to shift doesn't matter.. I get that most gearboxes you can shift faster than a second, and I can probably do it in half that with mine too, but mostly I don't bother. Anyways, a DSG box can potensially engage next gear simultaneously as it disengages the previous, but a normal manual HAS TO disengage one before engaging the next. this is my point. A dsg can be faster than any manual, but at the cost of weight, complexity and money.. For those reasons I like my daily driver to have the cheaper, more reliable and lighter option, even if it might cost me some time in a sprint... what will cost me more time in a dragrace is only running 1bar boost anyways ;)

[@mahxylim7983]

Love these series

[@AerisReyha]

I feel save if using manual... Because I could use engine breaking to do controllable sudden break if something happen... If using standard drum or disc break, it will suddenly stop and causing slip in tire... If the break is not working, it will be worse... But using engine break could slowdown your speed drastically while still in control because the tire still rotate, not completely stop...

[@asankakarawita3500]

Perfect video....keep this thing up..LEBest of luck

[@atheistbaba3036]

U never told how gears are changed automatically.

[@kinshuksinghania4289]

Controlled by a computer

[@1InfinityShade]

The world class t5 manual transmission has reverse synchronized. A dct is far more costly to rebuild than a standard auto because it must be rebuilt using the same method as a manual but with far more steps. So it costs more than a manual trans in the case a rebuild is needed. With this trans being a prefered option for preformance: a manual 6 speed is still supirior for proformance life and control. Thanks for the education on dct.

[@jrnascimento1448]

I'll make my best to help you as soon as I can. It's amazing the things I learned watching your videos. Just one question: What mechanism change the gears? Cheers:)

[@dosmastrify]

the hand shifter? probably can find diagrams of it

[@SabinCivil]

Thank you for your support. The sliding of sleeves and clutch activation result in different gears.

[@joevignolor4u949]

The Ford DTC uses two electric motors to shift the gears - one computer controlled motor for each gear set. Basically for each of the two gear sets there is a round wheel inside the gearbox that has a channel machined into its circumference. The channel is cut to form detents, which look like two ramps going in opposite directions with flat spots in between (you kind of have to see it). When the wheel is rotated by the electric motors the ramps push the shift forks back and forth. Also, the dual clutches are engaged and released by clutch forks that are moved in and out by two electric motors.

[@Nexusmaster777]

How does a computer determine which sleeves to engage? Say if i need to shift 3-4-3 and not 3-4-5?

[@joevignolor4u949]

First, one countershaft is for gears 1-3-5 and the other countershaft is for gears 2-4-6. Plus there are the two separate clutches - one for each countershaft. In total there are four electric motors involved - two for the two countershafts and the two for the two clutches. All four motors are run back and forth under the command of the transmission control computer. The four motors are all stepping motors, which can rotate incrementally back and forth under computer control to provide precise position control. The computer also has several sensor inputs: vehicle speed, brake pedal position, throttle pedal position, gearshift position, engine RPM, and I think they also have an accelerometer in there to measure instantaneous acceleration. The exact way the software algorithms in the transmission controller make decisions and control the transmission are quite complex and the engineers that designed everything are probably the only ones that know exactly how it all works. But by reading the tech manuals, by observation and by driving one of these vehicles this is basically how it works: When you go from Park to Drive with your foot on the brake you don't feel anything at first (no "clunk" like with a conventional automatic transmission). At this point the first gearset is engaged for 1st gear, but with the brake applied the clutches initially stay disengaged. Then when you let your foot off the brake without touching the gas one of the two clutches will start to engage lightly to make the vehicle start to crawl forward. Then if the driver steps on the gas and raises the engine RPM the clutch will continue to engage to accelerate the vehicle in 1st gear. While the vehicle is accelerating in 1st gear the other un-driven shaft will switch into 2nd gear to get ready ahead of time for the next upshift. At the proper vehicle speed and engine RPM the first clutch will disengage while the second one engages to upshift into 2nd gear. This alternation will continue back and forth up through gears 3,4,5 and 6 until the vehicle reaches the desired cruising speed. To answer your original question the controller has to decide whether the vehicle is currently accelerating or decelerating to decide what to do next. It does that by looking at the current trend in vehicle speed, current acceleration and of course the throttle position. For example if the throttle is 3/4 open and the vehicle is accelerating the controller will sequentially keep upshifting the transmission up through the gears until it gets to 6th gear. Then if the vehicle is cruising at say 40 MPH and the driver floors the gas pedal the transmission may decide to downshift to a lower gear to assist the engine. Then once the vehicle speed comes up and the driver lets off the throttle the transmission will then upshift back up to 6th gear again. Then finally if the driver wants to stop and removes his foot from the gas pedal and steps on the brake, which will cause the vehicle to start decelerating, then the controller will simultaneously disengage both clutches while it also starts downshifting the transmission back down towards 1st gear again to be ready for the next time the vehicle has to start moving and/or speed up again.

[@danmyself5341]

I understand, and there is a lot more space for improvements to make the DCT so much better

[@michdem100]

I really wonder how in DCT you (if that's even possible) skip gears. I have a 5-gear manual and when accelerating I'm on quire a low gear. I reach 50 km/h on 3rd gear and then shift to 5th to save on fuel. Don't know how it would work in DCT. Would it disengage like a manual one? Or would do two shifts?

[@HouseOfHacks]

If DCT are simpler than automatics, why are they so much more to rebuild/repair? My automatic based vehicle was in at the mechanics at the same time another customer had their DCT based vehicle in. The rebuild on my automatic was half the cost of the DCT's clutch replacement. Ouch.

[@dosmastrify]

depends on what was wrong of course

[@Electroblud]

Also, DCT's are not yet very common, i guess?

[@HouseOfHacks]

In this particular case it was just a clutch replacement. R & R the transmission with a new clutch installed. I think the clutch pack by itself (the parts) was as much as my whole rebuild, including labor. I'm guessing part of it is price gouging on the part of the dealer. They're new enough and rare enough that there's no 3rd party market for the parts so you're paying a premium just for the parts. But it was also apparently not designed very well for maintenance. There was a huge amount of labor just in the removal and replacement of the tranny.

[@Electroblud]

House of Hacks Aah yes. Not designed for maintenance is a large problem cars have these days. In our family car, they have to remove the whole intake and exhaust tube stuff in order to exchange the oil filter....

[@dosmastrify]

da faq?!? What car is that ElectroBlood ??

[@uss969]

Awesome guys great great efforts 👍👏👏👏👏👏👏👏👏👏👏👏👏

[@Tomyb15]

how is the smoothness compared to a cvt? and efficiency?

[@SabinCivil]

CVT is a stepless transmission. No technology can beat CVT in terms of smoothness.

[@Tomyb15]

+Learn Engineering and what about efficiency? is the cvt more inefficient than a dct? (and if so, is the difference important or next to nothing?) because I do not remember seeing a torque converter in your video about cvt. btw, I really enjoy your videos. I look forward for more!

[@parthpatels007]

I guess the CVT will be more efficient due to its infinite set of gear ratios. There might be other factors that I'm missing though.

[@TUNDRA2529]

CVTs are more efficient at holding a speed since it always can choose the optimum gear ratio for that speed; however, they have a limited range of gears so high speeds might not benefit (think of it having any real number between 2-6), also they weigh more than automatics which reduces overall efficiency. They also lose some energy due to slipping of the continuous converter. Overall: CVTs weight, slip, and limited gear range are disadvantages while its ability for close to infinite (technically only 1000s) gears inside that range is an advantage. They are improving materials to counter the weight, slip, wear, and gear range problems. That is why they are suddenly becoming popular.

[@ludwigharisuo6261]

I guess it depends on how much torque the transmission control unit needs to change the gap between the sides of the pulleys.

[@ulpo44]

My friends VW Passat with DSG went through 3 clutch packs and two gearboxes in three years of ownership. It couldn't decide which gear to preselect and was always shuddering the entire car. Getting rid of it was the best decision he made. I recommended he stick with a standard planetary Auto or buy a manual.

[@Shauryaaya]

tbh i did'nt get a thing but the graph 😂

[@TheOzthewiz]

I agree with everything the narrator in this video says about DCT, EXCEPT "has the smoothness of a regular automatic transmission"! The DCT remains a MANUAL transmission without the "third pedal", it can NEVER be as smooth as a hydraulic transmission because it ALWAYS connects the engine to the drive wheels, MECHANICALLY! I personally enjoy driving this type of car ('13 Focus) as I am used to driving manual transmissions, I like being able to feel the "tight" shifts and lightning quick gear changes! BTW, has had the latest version clutch pack installed along with the latest re-flash of the TCM and has been troublefree for the last 30K miles!!

[@joeracer302]

Love your videos, but color-blind (deficient) folks everywhere cry when red-green are used to highlight :p

[@MegaGeorge1948]

There are DCT's that have inner and outer "dry" type clutches. The clutches that you have demonstrated are "wet" type clutches. Because they are constantly bathed in oil, like on a motorbike. They are superior to the dry type. Because they are not prone to overheating. Manufacturers that use dry clutches are Ford and Hyundai for example. Dry clutches are sometimes prone to overheating due to the driver being stuck in stop and go traffic, causing the dry clutch to engage and disengage. The best automatic transmission, as far as efficiency and cost is the CVT that only uses a torque converter on startup and then locks up after the car gets going. Toyota and Subaru seem to have the most reliable CVT's. With Nissan having more reliability problems.

[@ramprasadaviator]

Can you please do the video on Aircrafts 3 spool Turbo fan engine please complete working video is appreciated ! And also on latest engines: P&W Neo GTF turbofan engine or Rolls Royce Trend 1000 Thanks!

[@matjazwalland903]

nice explanation, only this efficiency is the result of several factors. I will list a few: -gearbox weight, with oil and electronics (different types of gearboxes have different additional components which are not mentioned) -transfer of energy in the opposite direction when braking with the machine at lower revs. (downhill ride) -the experience of a person with a manual or automatic transmission is also a factor of efficiency, the automatic can be set for full efficiency when starting and is constant, while the manual transmission is not. - skipping gears although it is rarely used in extreme cases when necessary. (Driving on ice, sandy mud or fast braking and shifting into low gear in a bend) the manual transmission allows the person to make a choice and to give a feeling of immediate response. however, an automatic transmission can cause chaos in such moments, as it cannot properly overestimate the situation, even if a person chooses a gear, there is no clutch to help with the transmission of power in the right amount. I apologize for the inaccurate expressions because I am not an engineer and I am only communicating my opinion.

[@Off3er]

Manual is still the best option, not arguable

[@HafizAzmi]

Thanks for your video, easy to be understand...

[@G_Confalonieri]

There are two types of Transmissions: Manual and Lazy.

[@brainmind4070]

I think you mean: manual and I can eat or drink while I drive.

[@flipvdfluitketel867]

Brain Mind only women and animals eat in cars

[@brainmind4070]

Flip v d Fluitketel I’m okay with being called an animal.

[@jisyang8781]

G. Confallicneri Amish is allowed to use computer now? Go back to manual load horse manure.

[@keyehek1790]

fuck i eat while i drive in my manual all the time.

[@yashoza6079]

This is just awesome literally awesome, mind blowing... The way u showed it awesome... Pls make more videos like that it will just double my knowledge....

[@Faraonqa]

best transmission is Tesla transmission:D

[@thainaaier]

I am 100% with you on that fact

[@luzhrod3398]

i'm sorry to say it to you but electric cars doesn't have transmissions

[@Faraonqa]

TheTrollexis exactly

[@thainaaier]

TheTrollexis that's exactly why it's the best transmission.... very few or no transmission parts, means there is nothing to service or repair.... nothing can break, no power losses.... more reliable, more efficient

[@phantommedia9964]

Faraonqa Koenigsegg Regera, what transmission lolol

[@kesavanvaydeesh7226]

Awesome explanation.. thanks 😊😊😊

[@Kamuichan99]

The worst automatic transmission possible. It combines the disadvantages of automated manual transmissions with high costs and complex setups. Dry clutch DCTs failed for every manufacturer who offered them, regardless if VW DSG, Ford Powershift, Honda i-DCD or Hyundai DCT. If you intend to keep your car for a long time and travel without hazzles or jerky experiences, get an CVT or torque converter AT.

[@Tuppoo94]

Or get a wet clutch DCT. A six speed wet clutch DSG with a diesel engine is pretty common in VAG group taxicabs in Northern Europe. That combination seems to be holding together, but nothing beats a torque converter AT. The technology has been around for over 70 years, and is absolutely rock solid at this point.

[@Kamuichan99]

Then the Toyota HSD arrived and Taxi fleets are converting over to Hybrid, as emission standards get more strict and a Prius turned out to be as similar resilient as an Mercedes E-class.

[@TheRealMartin]

Or get a Tesla, and enjoy the simplicity without needing an Internal Combustion engine and complicated transmissions.

[@Tuppoo94]

Pass me a hundred grand and I'll buy one.

[@CalculatedRiskAK]

Don't know what you're on about. The Hyundai DCT is far from jerky. The one in my Elantra Sport is smooth.

[@Money4Nothing]

Great video, thanks LE!

[@19cmurry85]

Not sure if this is a click bait title in the thumbnail or not but DCT's are far from the "best transmission ever", haven't been for more than 20 years. CVT AMT or SAMT's are the best transmissions period. Continuously Variable Transmission, Automated/Semi Automated Manual Transmissions are far lighter, simpler, stronger and in regard to AMT's can shift just as fast as DCT's, hence why F1 uses them exclusively. The only reason F1 teams don't use the more efficient CVT is because it was banned in the 90's because the governing body for F1 was afraid the lack of shifts would dull the sport for fans. You guys use the word ENGINEERING in your title, you should take more pride in spreading proper information and not miss-information. DCT's are nothing more than a newish marketing fad for the auto industry to sell more cars to uneducated buyers, nothing more than a stepping stone from obsolete automatics/H pattern manuals to the proper and superior in every way... CVT or AMT.

[@AlexM-fq5nb]

Chase Murry are you serious? CVTs wear out much sooner than a DCT transmission. Not to mention theyve had to redesign the drive belt like 5 times to withstand normal use.

[@oskartuuling8703]

redesigning is evolution in progress. some technology progress some stagnante. some hawen't the potential some was banned in early days from F1 like the CVT but now its grown mature. DCT is only manuals another stepp. CVT is supreme, it controls the torqe much betther then other gearboxes and its the gearboxes ultimate job!

[@mathew5629]

Chase Murry my Infiniti Q50 has a CVT I love it but just scared for the bands to bust one day 😰

[@kutayarcan911]

Automated manuals are slow and clunky. What are you on about?

[@rizaldecarulla4789]

Good video and thanks for explaining.

[@steamsteam6607]

Fantastic video!

[@AJstylesmedia]

awsome animation... explained very well...