Understanding the Acura Sport Hybrid
ฝัง
- เผยแพร่เมื่อ 4 มิ.ย. 2024
- See the impressive Hybrid 7-Speed Dual-Clutch Transmission (DCT) used in the Acura MDX Sport Hybrid and the Acura RLX Sport Hybrid. Watch how this complex transaxle functions mechanically and with the assistance of an electric motor.
Clarifications.
- E-Drive is a marketing term used on the Acura.com sales website to describe this system.
- Intelligent Dual Clutch Drive (i-DCD) is an engineering term to describe this system.
TIMELINE:
0:00 Start
0:12 Introduction
1:52 Performance differential and counter gear
3:48 Secondary shaft for even-numbered gears
4:10 Main shaft for odd-numbered gears
4:43 Dual-clutch components and operation
6:50 The clutch pack for the odd-numbered gears
7:25 The clutch pack for the even-numbered gears
8:20 Power flow from the engine to the main shaft for odd-numbered gears
8:40 Power flow from the engine to the secondary shaft for even-numbered gears
9:54 Recommended automatic transmission fluid - Honda ATF DW-1
10:30 MUST SEE: Dual hydraulic apply pistons for dual-clutch packs
13:17 How power is transferred in the even-numbered gears
18:02 How power is transferred in the odd-numbered gears
21:20 MUST SEE: electric motor assist
22:31 Planetary gear set for first gear and power transfer from motor
24:10 First gear operation and calculations
25:50 Second gear operation and calculations
27:56 Third gear operation and calculations
29:34 Fourth gear operation and calculations
30:30 Fifth gear operation and calculations
31:30 Sixth gear operation and calculations
32:30 Seventh gear operation and calculations
33:20 How the electric motor contributed power in all gears
34:24 The reverse gears and the gear ratio mystery 3.66:1?**
35:37 Summary and Three modes of operation
36:27 The motor stator and case
36:49 Wrap-up
**The reverse mystery has been solved! A big thank you to Michel Kraus. Solution: "Even Gears" clutch engaged to the reverse idler to the reverse gears to the planetary gear set to the 5th gear. (54/34) * (51/54) * (35/63) * (1+(111/39)) * (48/42) = 3.663003663:1
ABOUT US
Weber State University (WSU) Davis Campus - Automotive Technology Department - Advanced Vehicles Lab. A technical description and demonstration of the Acura Integrated Motor Dual Clutch Transmission (DCT) used in the 2018 - 2020 Acura MDX Sport Hybrid and the 2014 - 2020 Acura RLX Sport Hybrid. We teach current vehicle technologies to our automotive students at Weber State University and online. For more information visit: www.weber.edu/automotive
This video was created and edited by Professor John D. Kelly at WSU. For a full biography, see www.weber.edu/automotive/J_Kel...
ADDITIONAL TRAINING FOR YOU
Join us for hybrid and electric vehicle training with two online courses and in a 5-day on-campus boot camp with Professor John D. Kelly. See www.weber.edu/evtraining
DONATE TO OUR DEPARTMENT
Please consider a donation to the Department of Automotive Technology at Weber State University here: advancement.weber.edu/Automotive
I've said it before and I will say it again; and probably in the future: John Kelley is the greatest DIY instructor on this planet IMHO. If one can not learn from him, they can NOT learn period.
Thank you John. You are truly a cut-above. I enjoyed every minute learning how this incredible 7 gear transmission works. WOW!
Thank you very much
John is, a legend.
By all definitions of a legend, John qualifies.
i share the same point of view. thank you very much Mr John D. Kelly
The reverse mystery has been solved! A big thank you to Michel Kraus. Solution: "Even Gears" clutch engaged -> reverse idler -> reverse gears -> planetary gear set -> 5th gear. 54/34 * 51/54 * 35/63 * (1+(111/39)) * 48/42 = 3.663:1
Gosh, that's a lot of gears turning!
So that's like the 2nd solution using different clutch and gears that gives exact same result! That's amazing :)
My solution was "odd gears" clutch engaged -> reverse gears -> reverse idler -> 2nd gear. It also came out to be 3.662. Option with using "even gear" for reverse makes sense allowing preselection of reverse for quicker shift.
I can't help, but calculating it over and over again with the above figures I always get 3.66300...:1. But I don't get fussy about it: just the 3rd decimal :-D
@@raspam You are correct. I fixed the error
hello there sir , is there anyway that I can get the dimensions of the whole transmission components ?
That's a very neat package, and apparently if you reverse the drive wheels and add two turbos, it's the secret sauce of the NSX.
Good point. We would need to add two more gears too.
Also the fit hybrid minus the two rear motors.
Wait, what? Please explain, I want to make my MDX even faster. :). The MDX is also 4 wheel drive with the two electric motors in the back wheels. Great video.
Good Lord ! This is just sooo complex and so many parts = many actuators that can fail. Im sure its more reliable than a dry clutch but all those moving masses mean energy loss. Weakest component are the dual clutches and actuators. I prefer the eCVT from Toyota hybrids. However i do like the fact that there is only 1 electric motor on this transmission.
@@miguelborromeo6010 Acura version is a replacement for displacement, turbo(s), or supercharger. You also get regen braking and torque vectoring with or without engine power to improve handling. Extremely smooth and invisible system. Never about getting improved mpgs (a happy by product of the Sport Hybrid design for only $1500).
I’m always amazed at mans ingenuity to invent these things and then package it in a relatively small housing.
Awesome.
You and me both!
Well and clear explained ! much better than Acura oem online training
Thank you
I have this transmission in my 2014 rlx hybrid and I love how smooth and quietly it shifts!!!!!
Thanks for watching
How many miles?
@@Shabbe02 160k, preparing to change the transmission fluid in 2 weeks x3 dw1
Thanks for making videos like this. I have to watch most of them more than once and spot something I missed every time! Explanations are detailed, organized, and well paced. You are truly a gem of a teacher.
John, you are awesome. Happened on these videos quite by accident, but owning both an RLX hybrid and a Prius found your videos on both incredibly clear and informative. Keep up the great work!
Best explanation of a dual clutch transmission I've seen... Nice work as always!
Glad you liked it!
Glad to see you Professor! Have a happy holidays!
Same to you! Thank you
Expertly explained in easy terms and useful demonstrations. I'm working on getting my L3 and have learned so much from your videos. Thank you John!
This is an incredible TH-cam channel, thank you so much for this content.
Thank you for these well detailed videos, John. I love listening to good teachers who can explain processes and operations in a way i can understand. There's a wealth of information on the channel, thanks to you!
Thank you
Great content as always, John. Really admire your attention to detail.
Thank you
Amazing content as always. Greetings from Kenya 🇰🇪
Thank you
Wonderful video! I love watching and I'm glad to see that you're still making videos. I missed the content during the 7 month hiatus.
More to come! Thank you
Love the explanation of how the hybrid 7DCT works. I have both the MDX and RLX hybrids and the powertrain is extremely smooth and always seems to be in the right gear for performance or economy driving. All 17-20 MDX hybrids come with the same 4 motor set-up as the 14-20 RLX hybrids (NA Engine, 7DCT+front electric motor, twin rear electric motors). The RLX hybrid can reverse in electric mode only with the 2 rear motors; but, the MDX hybrid always starts the 3.0L engine in reverse. I can't tell if the MDX hybrid is also engaging the rear electric in reverse because the display screen switches to the back-up camera. The 7DCT is one of the top rated and reliable transmission Acura/Honda has in its inventory. The only downside was you cannot tow with this transmission. Too bad Acura/Honda decided to drop the hybrid powertrain option.
Thank you for the walk through, very informative.
And really interesting to see.
Really cool transmission looks very well build and thought trough.
Thank you
So Glad you are looking well Mr. Kelley
Thanks for another great upload
Thank you very much
I have waited for a video of hybrid vehicle with dual clutch transaxle from you professor..Amazing..You did it..I suggest Honda hybrid DCT systems for ur upcoming videos.
I am happy you like it
He just did one of the Honda hybrids.
I drive the MDX Sport Hybrid and knew there was a lot of complexity going on, but you putting it on video really brings it home. The engineers that designed this are brilliant, which means you are also, in order to explain this. 🙇♀️
Thank you
Thank you very much
For the life of me I do not know why more people didn't buy the Sport Hybrid option for the MDX, I believe it was only 2k when we bought ours. The amount of performance increase you get over all the other same year MDX's is very noticeable. I think most people think slow hybrid when they see they it and are shocked when it flies off the line. I really wish they put this drive train in the ASpec version, I also wish Acura didn't kill it and improved upon it. One caveat for this video, the MDX Sport Hybrid has the same setup as the RLX, twin electric motors in the back, one in the front but a 3.0l gas engine. The RLX Sport Hybrid has the same electric motors but the gasoline engine is a 3.5l.
@@bdevine12 I miss that car for long trips. It was a little more expensive, so fewer people wanted to pay more. You are right that it was similar to the RLX, but also *similar* drivetrain to the NSX.
Awesome video professor John, I owned an acura rl since 2014 and had my eye on the new style rlx sport hybrid ever since Acura gave it a nice face and tail lift. Since I found out they stopped making them here in the United States I brought one as a Christmas gift for myself. I love the tremendous power it gives when you need it and can also save on gas. Would love to see a video on how their regenerative braking system works and how it recharges the battery. Thanks for the video and awesome value you bring
Another new technology hybrid transaxle with dual clutch so well explained, thanks Professor!
Thank you very much
Thank you, professor for sharing your wealth of knowledge, I;m enjoying it very much, each time over and over again. Have a good day too.
You are very welcome
So glad to see you again dear Professor Kelly, Seasons Greetings, please stay safe and healthy always sir.
Thank you
Thx U for your Time! I own and Love the 2014 RLX Hybrid
Thank you. I am happy to hear you like the RLX hybrid
Just beautiful explained, I just love this session. I always wait to it's nice and quiet around me and then I see your video, you know concentration is needed 👍 Thanks to you for all the time and effort that goes into making this video.
PS: The reverse gear is probably just a type error 😊
Glad you enjoy it!
Thank You for the explanation even though it blows my mind that it is in production with a warranty. You really are a great resource for us old guys..............Jay
Thank you
Many thanks John. Have a very Merry Christmas.
Same to you! Thank you
thank you very much for your videos. they are very interessting. Thank you again
Mr. Kelly you present a great video. I have had 3 Acura vehicles and would like to have one of these new ones....
Thank you
Another great video professor, thank you very much.
So nice of you
thank you Prof Kelly. great video.
John, I hope your student's appreciate your considerable talents in instruction.
Also, as an Acura dealer tech, thanks for showing a hands-on demonstration of the construction and function of this A/T. I've seen a lot of the information in self-study modules, but this really helps to get a grasp of how it all works together. Thank you so much! I've learned a lot from your videos like this one(as well as the ZF9, that was a good one too).
Thank you very much
More reliable than the Focus dual clutch? That is a low bar my friend!!! Thanks for another fascinating video.
Lol. Thank you
Un gran trabajo como siempre muy claro !!! Pena en España no se venda este modelo para poder probarlo!!
Un saludo y esperando más videos
Muchísimas gracias
Thanks for video! Yes , this is the same transaxle which used in Japan market Honda FIT, Shuttle, Vezel, there is only difference is a dual clutch, which different that you showed in your video.
Thanks for the info!
From Russia with love ! With love to your videos
Thank you
Would love to see a video on the 8 speed DCT with torque converter from the TLX/ILX - though I'm sure there is a lot of overlap with this one.
I would like to get one to explore, but it is low on my priority list right now. Thanks for watching
No.1) you're amazing at explaining complex systems, Professor!!
No.2) as impressive as this Acura unit is, I can't help but be even more impressed by the "simplicity" (note the quotations) of the BEV motor/inverter/gearset as you've shown in detail on say the Chevy Bolt!!
I look forward to the Tesla content 👍🏻👍🏻👍🏻
Thank you very much
Thank a lot for like this free training
You are welcome
Keep safe always sir godbless
Thank you for great explanation , amazing
Thank you
Intriguing design. Thanks for the walkthrough John. I've read Honda made a dry-clutch version for the Fit Hybrid (for other markets), only to be replaced with yet another transaxle design. There's certainly lots of effort spent on design at Honda!
Thanks for watching
I love your explanations! They are interesting to me even I am trained in VERY LARGE transmissions for steamturbines, powerplants für nuclear submarines and planetary gears up to 130t, etc.
Thanks for watching
Thank you professor for all your knowledge and videos'' :)
Glad you like them! Thank you
these videos are gold
Thank you!
Thank you very much Mr. Prof for the This video is Rich in information god bless you always 🌹 🇴🇲
Thank you very much
thank you verry musch Professor
You are very welcome
Hello professor !! Thanks for the informational video !!)
Thanks
Another Great instructional video.
Have a Merry CHRISTmas.
God Bless and keep y'all safe.
Thank you and merry Christmas to you too!
Great explanation, thank you.
Sounds like we need a new terminology for transmissions.
Decades ago I had a VB with a manual transmission but no clutch, it was called the Volkswagen Automatic Stickshift.
I like the idea of having an electric motor driving each wheel.
Thank you
Thanks for the another information that I got to you sir
Thank you
Im amazed by this guy... hes just sitting there getting winded by just... sitting there. Amazing
My 2020 RLX Sport Hybrid averages 28mpg while doing all wheel drive with 4 engines making 377 hp and 350ft pound of torque. Pretty amazing!
Great break down sir!
Glad you liked it!
@@WeberAuto 👍👍 it wasn't on my radar but I saw a used one for a good deal. Someone said it was the baby nsx without a turbo. That made me really look into it. I'm not big on the hybrids because I'm not familiar with the technology but I do trust Honda 100%
Thank you Professor, your content is always amazing. I hope to see you one day take a look at the Hyundai/Kia 7 speed DCT to compare it to the Honda and Ford ones. I hope you have a great Christmas!
Thank you. That would be interesting
感恩，謝謝分享！
John I can't stop thinking about this awesome transmission. So I have some trivia; that takes me back to the 40's. I remember very well the "new" phrase "Synchro-mesh"; that eliminated the problem in manual transmissions. Often called "Gear Jerking". And that horrible sound. LOL
This phrase was everywhere in the auto-world, when it came out. I was taught this in auto-shop in HS, in 1949 when I was 17 yrs old. And just think, your using the word "synchronize"; BUT used in a different way; is awesome. I can't get over that we are using something that went away; only to come back in a better way of using it. Wow!
In other words: in the old days the synchronizer items were constantly used to "mesh" gears from one gear to another. But in the new way, there is NO constant meshing of gears; for they are always in mesh; yet we still use the synchronizers and their "fork" drivers. Wow!
What hath man wroth?
I am blown away. But I doubt that I could've learned it (age 88 now), IF, it had not been for your rare innate style of instructing. Thank you, thank you kind Sir.
Thank you for sharing. Happy holidays
WOW! Excellent Professor! Thank you so much. What do you drive? I have an old 2002 Acura RL, Still runs and looks like new! One of the best cars I've ever owned. Thank you so much for this video, I learned a lot! Subscribing now. I will watch all your video's, great instruction and information. Thank you for sharing your knowledge!!!!
Thank you very much!
Don't forget me, still waiting on that info on the 2007 Mercedes GL450 4matic.
Thank you.
Thank you for the great video. Do you have plans to make videos on Honda Clarity plug-in-hybrid in the future?
My previous video was on its transaxle
No doubt you are the best educator and instructor on youtube for multitudes of the tech involved in today's hybrids and drivetrain. But my head spins just as the gears and spins even faster when the synchronizers are engaged. lol. It's a very complicated piece of transmission for the hybrid vehicle. Perhaps a set of motors that spins only at higher RPM and adds more torque and HP can be added for the less cost and more reliability. It will also reduce the motor whining noise of the larger motor that is spinning faster at higher RPM. Just a different approach to the complex solution. With the additional high speed motor on the drive shaft, you can simulate and feel as the automatic transmission shifting at these higher speed without more dry or wet clutches. You have made a very excellent tutorial on this dual clutch transmission but I think there could be just simpler and more reliable approach to the desired goal. May be I missed the goal that Honda / Acura is trying to achieve in the first place with the added complexity.
Thank you and thanks for the information
Acura is trying to erase the stigma of hybrids being whiny and boring with this DCT. I've been on track with an Acura Motorsports driver in an NSX and the shifts were very direct. Not something you could achieve with a dual motor power split device.
The Acura hybrid system is extremely smooth and seamless in gear changes. The electric motors act like a supercharger adding full electric power at +500 rpms. Other than the hybrid badge on the side fender, the Acura MDX and RLX looks and drives like a regular V-6 power non hybrid Acura vehicle (they just have 30-60 more hp and excellent city mpgs).
Thank you.
You're welcome!
Awesome. Thanks for sharing... Cheers.
Thank you
Once again a fantastic video that explaines a complex transmission in a understandable way. Thank you!
Does the engine driven oil pump supply the pressure for the cluthces? So the ICE has to run to be able to shift?
Thank you. No, the clutch hydraulic pressure comes from electric pumps.
@@WeberAuto Thanks for your answer!
Very good explain about Honda, and how about BNW 3 cylinders 218i , this English was more reliable and fuel economy between hybrid?
Thank you for such a great video. I was debating between buying a older Acura 2012 instead of the 2017 Rlx hybrid. Just because of the transmission. I'm very curious to know is it possible to post a video how to service that transmission. I can not find anything anywhere on how to service or even check it.
Thanks for the suggestion
Great video
Thank you
There's more moving parts in that transmission than in a whole EV.
Yes there are!
Why you need all that gearing when you have electric input, Prius has non other than their "diff" drive, this seems like a legacy solution when they don't understand electric motors
@@williamgoode9114 nobody is stopping you from driving a Prius :)
@@g1981c well it won't sell cos there's no advantage in performance and a huge cost in machining, most legacy companies are going to fail, and with thinking like this, Honda is one of them
@@williamgoode9114 what do you care how much machining is involved if it's all done by robots. it's all recyclable materials and doesn't require tons of copper, lithium, cobalt or neodymium like your beloved Tesla.
thank you
Thank you
Thanks!
Thank you so much for your kind gift, I greatly appreciate it!
Outstanding lecture Professor! Were you recording while attempting to install three shafts with only two hands? It would be nice to see the moment when they 'co-operated' and dropped into place...
LOL, yes, but I did not want to show the trouble it was installing them. ;)
Thank you very much for the video, Could you please also do a video on Hyundai/Kia dual clutch hybrid system? thanks.
Thank you. Yes, it is planned
Every time when you post videos I got amazed and crazy. It is amazing but I would like ask you question that what is the difference between CVT and an automatic trans Axel? After watching some other guise video a got co fussed a little. Thank you
Thank you, I have videos on each type. See my playlists
Another great video. Maybe you can also do a video on the new Acura NSX which shares hybrid technology with the MDX hybrid.
That sounds fun, but highly unlikely
Thanks..please need a demo how shift forks are operated..? And monitored. ..?
Thanks for the suggestion.
Great video! Had to laugh when the first clutch piston popped out.
By the way, curious if y'all are planning on doing one of the Lexus RWD hybrid transmissions? Like the L110, L110f, L310, etc
Thank you! Yes, I have an L110 right here. I am hoping to find the L310 too, but no luck so far.
The first Honda automatic boxes were I gathered achieved without paying anyone royalties so is the dual clutch a royalty gain for Porsche? Thank you very much for your superb teaching.
Thank you
Also I find it interesting that Honda/Acura decided to use the LuK electric motor actuator to move the shift forks. Most of the European DTC including Porsche PDK use hydraulic pistons and a valve body to move the shift forks. FYI, the 2nd gen NSX 9 speed DTC also uses the LuK electric shift actuator and a pair of hydrostatic electric actuators (also LuK/Delphi) to generate hydraulic pressure for clutch application.
Good information. Thank you
Greetings professor, greetings from Mexico City
Hello there!
I get it, but gee whiz. Things things this complicated in many cases don't seem to hold up. Love your work.
The 14-20 RLX hybrid and 17-20 MDX hybrid have the 7DCT and it just need schedule transmission fluid changes to keep peak performance.
Thanks professor
Thank you
Would you edit the video now showing the reverse gear path, I didn't quite get it
Hi professor John Kelly ! Thank you! Acura RLX there is no mechanical connection between the front and rear wheels?
For the Acura RLX Sport Hybrid there is no connection between the front and rear wheels. The rear axle is electric only.
Thank you...
Thank you
"I know, I'm getting sick of it too" While a little repetitive it is VERY educational and gets the point across. BTW, Damn this is pure machine and design porn, Thank You!
Thank you!
مرحبا بروفسور شكرا لك على الفيديو 👍🏽❤
Thank you
Marvelous explanation! IS this a similar technology to that used in Heavy Trucks that use a sequential type shift lever , (Wikipedia) The AM General M915 has a Caterpillar 16 speed semi-automatic transmission . I always remember the sound of Pneumatic pistons puffing when changing gears.
Yes, it is similar. Air powered shift forks, etc.
Very interesting, the dry dual clutch hybrid Honda uses in it's compact hybrid cars (hrv hybrid or vezel in Japan)/fit hybrid/grace hybrid) is similar as in it's also 7 speed, and the motor is only connected to the odd input shaft, but also completely to the odd clutch assembly, so it can drive 1st 3rd 5th and 7th independently of the engine, and it only drives through those odd gears only for eg engine in 2nd, motor in 3rd, engine in 6th, motor in 5th. But the motor shifts independently of the engine half the time, so shifts happen like: motor in 1st, engine starts in 2nd; motor shifts to 3rd while engine is still in 2nd; engine shifts to 3rd and now matches the motor; motor is still in 3rd while engine shifts to 4th; motor and engine both shifts to 5th etc. But one drawback; motor shifts are single clutch operated so when in motor power, you can feel the single clutch 'pause' between shifts (but if you're going with even a little bit of inertia the engine always kicks in to cover up the motor shift 'lag')
Thanks john Front México city
I have a 91 dodge D250 with a A518 RH that needs work what video's do you have that may be viewed to help me learn to work on it
No, sorry
I have 2 questions please.
1. Are those small battery boost jump starters , OK for flat aux battery, seeing as can use anywhere. But you mention current had to be limited to around 4A.
2. My YarisHybrid(UK) had flat battery after I left it defrosting windshield. Engine had kicked in . I came inside( with key-fob in pocket) for 20 mins, I forgot I left car running actually.. . At what point does the car stop recharging aux battery. I assume because I was out of range for too long ?
Thanks for watching
Amazing
Thank you very much
Hello Mr John , I hope you’re doing alright.
I have an MDX 2018 hybrid , my transmission was shaking and hesitating when it comes to shift , I took it to an Acura dealership,they told me that my transmission is defective, and I should replace it .
I bought a used transmission that has 80k miles on it , I had a transmission shop replace it .
When he was trying to program, relearn, and synchronize it , it didn’t work , I towed my car to an Acura dealership to preform a programming, they weren’t able to do it .
Now the technician is suggesting a new blank TCM module and program it with that installed transmission.
I would highly appreciate it if you could help me with any advice and witch route I should take .
Thank you 🙏
May I request, I have a Ram 1500 with the 8 speed trans. -- would you consider this system as reliable as the 8 speed in the Ram?
Thank you. I did that one a few years ago. See ZF 8HP video on my channel
Is it the same gearbox that is used in the Honda Vezel, an Hybrid SUV for the Japanese domestic market?
I do not know. Thanks for watching
Muito bom vídeo 🇧🇷🙋💯
Thank you
Friend has a Proton Savvy, which is a single clutch automatic. Shifts on it can best be described as glacial, as it will actuate the clutch, wait for a time, then change the gearbox to the appropriate gear, and slowly release the clutch to engage. Drive it and you are never going to get any fast changes, though it is otherwise a peppy vehicle for the mass and engine size.
Glacial shifts. That is a great description!
Is there a shift ring for locking and unlocking of the ring gear?
Yes, I forgot to show it
This was very interesting. I am looking forward to the upcoming Tesla videos!
Thank you
You should have a sign outside your shop saying: Gear-head arguments settled here.
LOL