Hi, Thanks for the comment and concern. You should have seen me try to do this demonstration on a steel bench, everything was sticking to the bench and to each other; it was a disaster. I could not even pick up the MG2 rotor when it was on its side. I had to roll it to the edge and slide it off. It is amazing how strong those magnets are. Cool technology!
Key to understanding how the drive works is the fact that MG1 and MG2 are AC motor-generators and their speed can be controlled exactly by the computer. This is how the ratio between crankshaft, electric motors, and drive shaft speed is controlled, i.e., how the drive acts as a CVT.
This was a tremendously helpful video and I want to thank the presenter for all the work in doing it. It helped me to understand a lot about planetary gears and sun gears and ring gears and their arrangements. You have to remember what this system is actually doing (and doing very well) in your car. I own a 2016 Prius C, which I love. I suppose the gear ratios in it are even better. As a former operating engineer, I appreciate the genius of Toyota in building these amazing machines. They are only going to get even better. Again, thanks for the great presentation, WeberAuto!
Thanks for the comparison. I did not know there were any major changes to the transaxle for the 3rd generation prius. This does explain a lot, especially how the plug-in version can go faster in EV mode. I'd like to see an explanation of the Chevy Volt transaxle!
My first model Prius 2001; Second Prius 2011. Now I think I understand how the 2011 cruise control is able to slow the car preventing overspeeding on downhill runs, a feature I didn't discover immediately. Very useful function.
Hi, the motors are three pase AC synchronous (with permanent magnets on the rotor) . They are not induction motors, they are not DC, and they do not use brushes. The ICE is not held stationary, but it stays stationary when off by the engine's own compression, friction, and lack of momentum. It takes much less energy to turn the MG1 motor while in electric mode. The charge rate is turned down to a low level allowing MG1 to rotate with less effort.
This was very detailed and helpful, and now I understand how some hybrid vehicles can drive without the engine on at much higher speeds than others. I bought a 2014 Avalon hybrid just a few months ago and I've been so fascinated by the hybrid transmission system. Only regret was not being able to get a newer car with 4th gen transmission, then I could drive without the engine on st much higher speeds
Mechanically, these are very, VERY simple compared to a typical car transmission. All of the complexity is in the electronics and they're proving to be pretty bulletproof.
Thanks for helping me to understand how these ecvt transmissions work. The design is so elegant and robust. So much going on with the torque controlling from the ICE and motors. Mind blowing to think about gearing to change maximum e-only vehicle speed. Very cool!
Not really. The Prius is pretty hard to beat. There are thriftier cars to drive but they're almost exclusively tiny, not available in the US, or no longer made - or all of the above.
Are those actually the motors or just the rotors from the motors ? Either way when you look at the size of a washing machine motor which is only a couple of HP they are incredibly small.
Wow! This is extremely well prepared, well presented, demonstration. I just bought a Prius and, being an engineer, I need to know how it works. This and the simulation that’s available here are definitely clarifying this fascinating system for me. Thanks for all the hard work that obviously went into this. 👍👍👍
A reason for the taller gearing on the Prius C is that it runs a lower voltage hybrid battery. Motor RPM is proportional to voltage and so it can't run the motors as fast meaning it needs taller gearing to get the same roadspeed. Given its a smaller, lighter car it needs less torque which is good because that's also what you get with taller ratios :) Great video, thanks.
@WeberAuto. Thanks for the video. I was on the fence between getting the 2nd gen & the 3rd gen & now I'm going to pass on the 2nd gen. I also was hesitant on getting a Prius because I thought that it had a belt driven CVT. I feel a lot more comfortable about the decision now. I've also seen high mileage reviews & not one mentioned anything about the transmission or batteries failing.
@@VoiceAlertTexas Oh wow! I've heard that they make very good rebuilt battery kits for around $1,000. I think that beats all the other fails that a regular car could have.
Almost no belts or chains. The 1st and 2nd gen had an internal chain link from the output of the planet gears to the differential area of the transaxle. 3rd/4th gen drives the diff directly.
@@alanowa123 thx....now 240000 on it with first battery and i did oil change in the 2 small gear boxes front and rear.. still runs strong ;-) th-cam.com/video/3bSB_TdBA8A/w-d-xo.html
Great video. I watched an animated video years ago when we bought our 2010 prius. It illustrated the basic concept of how the system worked but left a lot to the imagination as to the actual mechanical setup. For me this video filled in the gap. Good stuff....
Very good ! but I have to say, perhaps it is because of this rainy Sunday afternoon, but he threw me in the quickest and deepest sleep I ever experienced in my life...
Your explanations filled in a lot of the gaps in understanding I had after watching Niels Blaauw's excellent video. These two together cover the topic well.
Excellent video! Question: Does an eCVT require any maintenance like fluid changes? If the car is high mileage (e.g. over 300,000km) and the fluid had never been changed, do you recommend to change it or at this point leave it as is? Thanks in advance.
So, just two main changes, aside from various sizing changes: 1- unitized, clutch assembly (non-serviceable friction plate) 2-dual plane planetary, with independent ratios for MG1/MG2 Did I miss anything?
As a neophyte to this design, I was looking for how the vehicle changes gears. Is it correct to say that gears don't need to be changed because the electric motors can operate at widely variable RPM, and the gas engine just helps out by charging the battery, and when needed for a power boost?
One question bugs me. When you hold one component of a planetary gear set solid and rotate another component, the third component responds. But it can respond with only so much force you hold the first component down, otherwise your hold breaks if the output has too high resistance. Now, with "holding down" replaced by electric motors, how is the force to set the car in motion transmitted to the output? How is such a great force resisted by the small MG1 or the infernal combustion engine so that the wheels get turned?
i do have prius 2013 2nd generation there is no energy flow and i have message saying hybrid sytem pr9blem message was inverter coolant pump i did change it but still the same problem can u please help me thanks
Thanks for taking the time to make a Long video...everything today is Rushed and just sucks because you end up missing details! I prefer videos like this, where it feels like you're in a REAL classroom and have time to absorb it! Good stuff!
These late versions are much superior to the cone and pulley CVTs which most other cars have. There are no torque converters, gears meshing and un-meshing. None of those wear prone devices. Everything is “tight” at all times. That’s why these transmissions are so reliable.
I have observed and visualised one thing. From 26:38 MG1 is idling in reverse. To run the engine the MG1 field reduces its speed transferring the resisted ring gear motive force to turning the planetary,hence starting the engine which turns in a clockwise direction (in the video the engine is turning in the wrong direction). This confirms the namograph presentations upon running on MG2 and upon MG2 + engine. MG1 changes direction upon the engine running.
Kudzanai MG1 only changes direction with the engine running when the vehicle is stopped, otherwise, it will always rotate the same direction as the engine. Good catch on the entire presentation being shown with the components rotating the opposite direction as they should have been, It makes no difference in the theory of operation though (other than it is backwards). Thanks for watching.
WeberAuto Alright. I had taken it from your P111/P112 presentation, though i now notice MG2 forward has changed owing to the motor speed reduction gearset. You have a wonderful initiative (video lessons).
The IC motor (driving the planetary gear set) must rotate in the opposite direction from the electric motors (both driving sun gears). As the IC motor starts, MG2 must slow down, not speed up. You should re-edit the video to show this, including the IC motor driving the wheels with MG2 stopped.
Great video! Watching this because i recently did a hard acceleration onto the freeway with my rav4 hybrid and was worried thinking it had a belt drive cvt.
regenerative braking ? release the acelarator cut's the power and turns it into a generator ? how does pressing the brake peddle cause further resistances from the generator's.
Yes, the rotors in the hybrid transaxle can be a drive motor or a generator, nothing else. You are either accelerating or decelerating. When decelerating, the spinning rotors with magnets inside of them induce current into the stator windings which creates a reverse polarity voltage and reverse magnetic field. This reverse magnetic field opposes the forward rotational direction of the rotor and makes it more difficult to rotate. This slows the vehicle (regenerative braking). When simply decelerating, only the large MG2 rotor slows the vehicle. When pressing on the brake pedal (or putting the transmission in the "B" position, both motors (MG1 and MG2) go into regenerative braking mode and slow the vehicle more quickly. Thanks for your feedback! have a good day.
Thanks for this great video. This makes many things clear! I think you made a mistake in the description of the transition of MG2 drive to ICE drive (27:00): You turn the ICE clutch damper in the wrong direction so that MG1 will turn faster (obviously too fast if it´s already a bit quicker than MG2). Actually MG1 will turn slower (breaking as a generator) to start moving the ICE in the SAME direction as the wheelgear already rotates. At eahart.com/prius/psd/ this is well demonstrated with the shown nomograph. Moreover at higher speeds there is a point where MG1 stops spinning and reverses direction. Remarkable difference to 2nd generation PSD: In normal forward drive the ICE and MG2 rotate in reverse directions! This is caused by the additional planetary gear set in gen. 3.
Yes, when the vehicle is in good forward motion and the Internal Combustion Engine (ICE) is to be started, the rotational speed of MG1 is decreased by applying a breaking force by means of electric current to MG1 from an electric converter. At low forward (or reverse) motion of the vehicle, or high rotational speed (RPM) of the ICE, MG1 reverses rotational direction. In 4th. generation Prius, MG2 is no longer coaxial with MG1 and the ICE. I'm unsure as to whether MG2 employs a planetary gear set or not in 4th. generation Prius.
I have something haven't understood yet. When both ICE and MG2 are spinning, if MG1 (sun gear) without any resistance, the ICE is also spinning freely, they can't output power together. So I think the power consumption from MG1 (when act as a generator) is the source of MG1's resistance. But if the battery is full and I want to full acceleration, which device can consume MG1's energy? MG2? If the battery is empty, does the eCVT just like MG2 connect to MG1 phase to phase?
outoflegend Hi, MG2 consumes power generated by MG1 and from the battery. If the HV battery is low, the ICE can power MG1 to generate more power to feed MG2 and/or charge the HV battery. The charge rate of MG1 can be increased or decreased as necessary dependent upon driving mode (EV only, or combined EV and ICE). Even if the HV battery were completely charged, the current draw required to power MG2 under full acceleration is always greater than MG1 can generate, so the battery must also supply current. I hope I answered your question.
plz answer me . when you put gear shift at B position ,the generator drive the thermal engine and the engine applies torque to electric motor . So how to reduce the vehicle speed while the electric motor is still applied the torque ( electric motor connect to the wheels )?
@WeberAuto Dear Professor Kelly, I have 2 questions please: How is the lubrication implemented? Is it splash lubrication? I see several caged, open deep groove ball bearings and I assume the planet gears use needle bearings. 2) I know Toyota WS (World Standard) ATF is used. How well does the lubrication work at cold temperatures? With the car stationary and the ICE idling high (1300rpm because warm-up), MG1 spins at ~4750rpm. When moving at 50mph, MG2 already spins at ~6000rpm. What if the car sat outside in winter at 5-10°F? Does the lubrication still work reliably? Would it maybe be a good idea to drive a bit slower during the first few miles? I could not find a PID for ATF temperature to monitor how long it takes to warm up. Thank you! Regards Dan
As demonstrated, I didn't see any direct mechanical connection between the ICE and the final drive. Is the ICE only used to drive MG1 to generate electricity that drives MG2 which drives the vehicle?
+Leo M. Mara There is no direct mechanical coupling between ICE and final drive. That is why it is a type of eCVT...Infact, there are different modes of operation as was explained in another video by John on working of Prius 2nd Gen...I have explained some cases...1) When power demand is below a certain threshold and battery has sufficient charge (SOC), battery powers MG1 which drives MG2 and intern final drive...2) When power demand is below a certain threshold and battery has low charge, MG1 will act as a starter for ICE and subsequently when ICE starts, it acts as alternator and charges high voltage battery...3) When the power demand exceeds a certain threshold, power split device based on the control strategies of the Hybrid controller varies the speed of the ICE and MG1 in a ratio (depending fully on the planetary gears ratios) such that torque produced by ICE is used to assist MG2 in providing power demanded by driver while remaining torque drives MG1 which acts as a generator and charges high voltage battery...Sorry for the long explanation...Hope that helps you!
If the ICE is running and you hold both MGs stopped then the ICE will drive the vehicle. If there were brakes on the MGs then you could actually do that, but there aren't, so it would take electrical power to hold them stopped. So it's better to let one MG spin (MG1) and brake it electrically by generating power and use that power to spin MG2 slowly forwards (increase the road speed) or backwards (decrease the road speed). Er, I think :-)
After watching one part more carefully (and the 4th gen Prius teardown) it's become clear that you can't have MG2 stopped while the vehicle is moving. The 2nd planetary gear set isn't being used as a 3-shaft mixer as you'd expect (and as the 1st planetary gear set is) -- in fact the planet carrier is fixed (that's what the vicegrips were being used for in the video) which makes it a simple reduction gear between MG2 and the output shaft to the wheels. This is more clear in the 4th gen video, where a simple conventional geartrain with one intermediate shaft is used between MG2 and the output drive to the diff&wheels. So MG2 always spins at a speed proportional to the vehicle speed.
Clutch I think on the 400H might cost thousands, if I don't do it my self. Easy but time consuming. Patience along with all the good info to try swap transfer should be easier specially if I'm not sure what part is wrong like a pin bearing or final drive gear in power split or burnt coils or clutch. Soon as engine comes on its like a broken piston ring bit goes n comes back. Might just be bad gas clogged injector or coil n plugs are toast it looks like. I was driving Ving fast yesterday so I think clutch because it had new oil change. Thanks for the videos top notch
can you please explain to me the drive train of the 2015 prius, is it a electric motor that powers the wheels? and the reverse is only powwered by electric, not the cvt. I dont get it
+djclown7pb hi, this is the explanation. Reverse or forward can be electric only or a combination of electric and gasoline engine. Thanks for watching!
Weber Inst. Thanks a lot for the videos.. they are very usefull for us, people in the third world where innovations arrive a little late but unfortunely the tecnology for repair it is only for a little groups that prefer to hidden it and be only with the truth. Thanks to you and your org. we can have a better understanding for accomlish the repair labor. In case of electrical vehicles it will be necessary to develop an a very simple way to detect failures with help of a multimeter because other devces are or impossible to get them or innoperable due to lack of escolar education in the electrical area and in the mechanical. thanks once again...
Those oil pumps you showed are only for the transaxle, correct? I'm also confused why the MG2/MG2 can spin so high on PriusV (P410) but the internal combustion engine kicks on at a very low speed (like, 15 MPH) with the warning that you're going too fast for EV mode. The plugin version has *about* the same RPM limits as the MG1/MG2 P410, at least that's what it sounds like you said.
Hello John, Thank you for this video as I/we just purchased our second Prius (2010) which is a 3rd Gen. Our first one is a 2nd Gen. We have a friend who also had the 2nd Gen...but (supposedly, according to HER mechanic) the Transmission FAILED (she only had @145k miles on it). That didn't seem plausible being THAT it is a CVT, however MAYBE I need to learn something. In your experience....are the 2nd Gens prone to FAILURE, and if so, How So ? I ask this because on our newest one....I'm considering CHANGING THE TRANS-FLUID as it just now turned 100k miles. In looking up the Fluids for both Gens, I noticed that the fluid for our 2nd Gen (which is a 2004 model) may actually use a DIFFERENT FLUID than the 3rd Gen (both are RATED Toyota WS, howEVER, Valvoline Synthetic Trans Fluid (also with WS Rating) shows that theirs can only be used in the 3rd Gen CVT. Can you clarify for me ? (thanks for letting us know that the 2nd Gen CVT uses a Chain-Drive vs. the Gear Drive.....does this also mean that the 3rd Gen CVT is Superior, partly because of this ? ) Also, one last thing, some people think....yes EVEN SOME TECHNICIANS...that because the Toyota CVT is a "sealed unit" that it does NOT require the changing of the fluid. What say Ye, Ole Master Tech ??? Thanks again.
+ConnectTheDotsNOW Hi, No, the 2nd generation transaxles have been very reliable. I wonder what "Failed"? Unless there was a fluid leak leading to oil starvation at the bearings or physical damage from running over something, there is very little that can fail. As you know, all generations of Prius transaxles are not sealed units. There is a fluid fill and drain plug. All of the "sealed transmission" stuff is just a marketing ploy to trick people into purchasing their vehicles that don't require service under "Normal" circumstances. See your maintenance guide, there is a fluid change interval. The WS fluid is compatible with all 2004 and newer Toyota transaxles. I don't know why Valvoline would say that if their fluid meets the WS specification. Best wishes!
What happens when you hold MG1 still and turn the ICE? In your demo all 3 motors are spinning the same direction. ICE causes MG1 to spin faster in the same direction. MG2 causes MG1 to spin faster in the same direction. MG2+ICE spinning in the same direction show MG1 spinning crazy fast in the same direction. Shouldn't one of these spin the opposite direction? I wish I could find a video that shows not just gear ratios, but also power distribution. Like, how does increasing the engine RPM actually make the car go faster instead of just spinning the electric motors? When I look at my Torque app MG1 actually spins backwards until I rev the engine. At highway speeds MG1 is usually close to 0 RPM while ICE as at 2500 and MG2 is at 10,000 or so. The Torque app will show -20 ft-lbs of torque at MG1 (0 rpm still) Obviously you can't use the battery to apply constant resistance to the MG to redirect ICE power to the wheels because the battery would run out of power. Amperage to the HV battery system usually is around 0. (negative amps = charge) So I'm guessing the MG1 spinning in generator mode is used to power MG2, and the resistance created in MG1 is used to force the ICE power into the final drive. Then, breaking is still confusing. I think MG2 generates while MG1 is free-spinning. I guess that's the most difficult spot to visualize is which MG are free-spinning vs which ones are generating power and which are using power. Sorry for the streaming brain dump.
MG1 is attached to the sun gear, so it can control where the motor power goes. In another video, he says that for the car to operate at 65 MPH, the ICE can spin at 3300 RPMs with MG1 matching speed, or the ICE can spin at 2200 RPMs and MG1 can be stationary. Since MG1 controls the sun gear, it being stationary would push all engine power to the ring gears and then the wheels. MG1 can be free-spinning to generate electricity, or it can be given power to transfer engine power to MG2 and then the wheels.
Perhaps the concept that either of the motors can apply torque in either direction, so they may appear to be freely spinning, but the system can apply torque both in the direction of rotation (adding speed) or in the opposite direction (braking or generating) giving whatever control output is required.
Wow, great illustration of hybrid synergy drive. I have the Prius Plugin. Now I understand how this works,it gives me a piece of mind that it will last for a long long time! With this explanation, I can see why the Prius Prime evolved the same pathway to even higher electric only speed with the same concept. No wonder it is so reliable. By evolution road proven approach, you have real life test runs already done instead of revolutionary method that needs to be take a good time proven initially to get it right.
Thanks for the feedback. Here is a new series on all four generations of Toyota hybrid transaxles. th-cam.com/play/PLIn3FrDiB1lyzmzZNBM24V_FsyuDx8ow_.html Have a good day!
Thank you for.your explanation was considering purchasing a gen 2 from 2009......but will hold off and purchase a gen 3.....looks like a more efficient and durable design.......
Really interesting explanation! What is the exact purpose of the oil pump, since this transmission has no metallic belts (Nissan, Toyota) or chains (Audi, Subaru)? Heat dissipation?
good work Weber, this is hard information to find. I watched your whole video at regular speed and found it informative but i wish you'd work on your presentation a bit better as i didn't think to use 2x speed.
Why does the flywheel at the back have gear teeth when the Prius does not have a conventional starter? Why do they have a clutch plate is it a cheap way to incorporate a damper?
So is the clutch what allows the gasoline engine to run with the wheels stopped? Or is the planet carrier spinning with the sun gear but the ring gear is still?
Question for you, I was showing my dad this video, he was explaining to me that there's still a belt or chain used. I'm confused, can you help me out here?
hello! i have a problem: I a bought a toyota prius V with seven seats used at taxi and it has 205000 miles... after thermic engine starts the transimision shake at a constant speed like about 40-50mph, it shakes and seems like clutch inside not pressed enough, but if i press the acceleration harder it works well... I would like to know what could be the problem because the motor mointing rubered holders are replaced and are brand new. thank you! jacob
If the engine is misfiring or not running correctly, the damper springs on the torque limiting clutch disc will oscillate causing a terrible noise and vibration.
WeberAuto thank you so much fot the answer! It means the damper disc and it s springs are exausted, i should buy a new one. 31270-47060 is the code..."Damper assy transmission input" And just in case i remove the inverter it resets the hybrid system and than needs softwate service to set it?
In reference to ToyotaKTM, possibly Toyota Engineering wanted to use a starter motor on the original ICE. So, they ordered the ring gear on the flywheel. Then, at some later point, the starter was eliminated. The other theory could be that this flywheel is a multi-purpose flywheel that can be used in another vehicle, not propriety to Prius. I saw the ring gear on the flywheel and questioned the same thing.
in many nothing; some new have another fixed first gear for faster take off an a stop light. But i think that belongs to Toyotas too; in the end its all Toyota. My Lexus RX Hybridhave a V6 Hybrid and 2 e Motors for AWD running 200km/H max. The same powertrain with 1 e motor (no AWD) in the GS450H runs 250km/H because its e-cvt have 1 overdrive stage to reduced rpm´s from e-motor and so car can reach higher max speed.
Hey Prof. I'm trying to figure out the service regimes for the highlander and Prius. After how long should one flush the coolant, WS transmission fluid and engine oil in equatorial climate? Thanks
Thanks for the very informative video! I have a couple questions if you don't mind... What kind of motors are MG1 and MG2? DC brushless? Also, what holds the ICE stationary when in pure electric mode? Is there some sort of brake band?
+Arlen Ung Hi, no, the plug-in transaxle is very similar, but has different gear ratios to allow the engine to stay off until 61.5 mph rather than 40 mph. Thanks for watching.
Yes, it is possible, but the design of the transaxle gives it lower torque than the third generation models. The 2nd gen models only has 4.113 rotations of MG2 for each revolution of the tire. The 3rd gen models have 8.615 rotations of MG2 for each revolution of the tire. Almost twice the torque.
i picked up my car today from Kauai community collage The shop teacher said he had never seen the Hybrid batteries arch like mine . two batteries turned out bad because they had arched , the car runs like new now , well worth the 1200 spent..at the collage and i let the students actually learn something using my car , so it is good karma i think,
So what car years are these 2ng gen and 3rd gen CVT ? Which CVT is in the 2006 Prius and which is in the 2010+ Prius?( the one with indicators in the mirrors and keyless go.)
These are literally the most reliable transmission systems in the world right now, and you can see why.
I wonder how much less reliable 2nd Gen are compared to the 3rd Gen.
@@MaximC They aren’t less reliable.
@@afcgeo882
You sure? I've read the chain may fail. Why they changed it to direct then, for other reasons?
@@MaximC It has NO chain! Did you watch the video? Toyota’s eCVT are planetary gear sets, not CVTs.
@@afcgeo882
He did mention it, a chain in 1st and 2nd generation of Toyota's PSD/eCVT.
Hi, Thanks for the comment and concern. You should have seen me try to do this demonstration on a steel bench, everything was sticking to the bench and to each other; it was a disaster. I could not even pick up the MG2 rotor when it was on its side. I had to roll it to the edge and slide it off. It is amazing how strong those magnets are. Cool technology!
I'm super amazed to see that 1.2 MILLION people expressed interest in learning about these transmission from your video 😳
Key to understanding how the drive works is the fact that MG1 and MG2 are AC motor-generators and their speed can be controlled exactly by the computer. This is how the ratio between crankshaft, electric motors, and drive shaft speed is controlled, i.e., how the drive acts as a CVT.
Great feedback!
Great explanation
@@WeberAuto does the lexus gs450h hybrid gearbox have the same mechanism and work in the same manor?
Hi, providing various amounts of resistance causes the overall gear ratio vary. It makes the transmission act like a CVT.
This was a tremendously helpful video and I want to thank the presenter for all the work in doing it. It helped me to understand a lot about planetary gears and sun gears and ring gears and their arrangements. You have to remember what this system is actually doing (and doing very well) in your car.
I own a 2016 Prius C, which I love. I suppose the gear ratios in it are even better. As a former operating engineer, I appreciate the genius of Toyota in building these amazing machines. They are only going to get even better.
Again, thanks for the great presentation, WeberAuto!
Thank you!
Thanks for the comparison. I did not know there were any major changes to the transaxle for the 3rd generation prius. This does explain a lot, especially how the plug-in version can go faster in EV mode. I'd like to see an explanation of the Chevy Volt transaxle!
Wow, you commented this way before you made it big.
Hi!
wow
Great explanation! I can’t believe how small it all is and that there is no cvt belt. It’s nice to understand my car more.
My first model Prius 2001; Second Prius 2011. Now I think I understand how the 2011 cruise control is able to slow the car preventing overspeeding on downhill runs, a feature I didn't discover immediately. Very useful function.
Hi, the motors are three pase AC synchronous (with permanent magnets on the rotor) . They are not induction motors, they are not DC, and they do not use brushes. The ICE is not held stationary, but it stays stationary when off by the engine's own compression, friction, and lack of momentum. It takes much less energy to turn the MG1 motor while in electric mode. The charge rate is turned down to a low level allowing MG1 to rotate with less effort.
This was very detailed and helpful, and now I understand how some hybrid vehicles can drive without the engine on at much higher speeds than others.
I bought a 2014 Avalon hybrid just a few months ago and I've been so fascinated by the hybrid transmission system. Only regret was not being able to get a newer car with 4th gen transmission, then I could drive without the engine on st much higher speeds
Mechanically, these are very, VERY simple compared to a typical car transmission. All of the complexity is in the electronics and they're proving to be pretty bulletproof.
Thanks for helping me to understand how these ecvt transmissions work. The design is so elegant and robust. So much going on with the torque controlling from the ICE and motors. Mind blowing to think about gearing to change maximum e-only vehicle speed. Very cool!
Nice to see this graphically illustrated. Thank you.
Thank you!
Watch these videos all the time this guy is a transmission PRO!!!
If people knew how insane geniously this is and work, everyone would buy toyota hybrid. It works just amazingly great.
its neat but if fuel economy is your game there might be better choices.
Not really. The Prius is pretty hard to beat. There are thriftier cars to drive but they're almost exclusively tiny, not available in the US, or no longer made - or all of the above.
either way, they are a bit "optimistic" with their mileage ratings.
My wife's 2010 gets 50 mpg +/- 3 mpg all year long, even though most of her driving is short trips.
My wife still gets the rated 47 MPG in her 2008 with 160,000 miles on it.
Excellent - thank you! Those gear sets are works of art. Amazing to see how compact the electric motors are compared to an internal combustion engine.
Hm
Hm
Are those actually the motors or just the rotors from the motors ?
Either way when you look at the size of a washing machine motor which is only a couple of HP they are incredibly small.
Yes likely just the rotors shown there. Would be nice to see the entire assembly.
Wow! This is extremely well prepared, well presented, demonstration. I just bought a Prius and, being an engineer, I need to know how it works. This and the simulation that’s available here are definitely clarifying this fascinating system for me. Thanks for all the hard work that obviously went into this. 👍👍👍
Thank you!
A reason for the taller gearing on the Prius C is that it runs a lower voltage hybrid battery. Motor RPM is proportional to voltage and so it can't run the motors as fast meaning it needs taller gearing to get the same roadspeed. Given its a smaller, lighter car it needs less torque which is good because that's also what you get with taller ratios :)
Great video, thanks.
@WeberAuto. Thanks for the video. I was on the fence between getting the 2nd gen & the 3rd gen & now I'm going to pass on the 2nd gen. I also was hesitant on getting a Prius because I thought that it had a belt driven CVT. I feel a lot more comfortable about the decision now. I've also seen high mileage reviews & not one mentioned anything about the transmission or batteries failing.
Thanks, The 3rd gen is a great car
Batteries shot after 200,00 for sure.. I know.....I have a 2013 with 206,000
@@VoiceAlertTexas Oh wow! I've heard that they make very good rebuilt battery kits for around $1,000. I think that beats all the other fails that a regular car could have.
@Paul Stejskal No it can't, the whole point is the batteries powering the vehicle half of the time, it is more an electric vehicle with ICE assist.
07 Camry, 380000 miles, original battery still going
So, no chain, no belt, all geared.
This should be more durable than the CVT in the background that's belt driven.
Very true!
Almost no belts or chains. The 1st and 2nd gen had an internal chain link from the output of the planet gears to the differential area of the transaxle. 3rd/4th gen drives the diff directly.
@@Driver6M what does my RX450h from 2010/11 have ?
@@kubanskiloewe only gears, no moving parts expect gears
@@alanowa123 thx....now 240000 on it with first battery and i did oil change in the 2 small gear boxes front and rear.. still runs strong ;-) th-cam.com/video/3bSB_TdBA8A/w-d-xo.html
"Very strong magnets" *sticks hand between them.
The third generation is a better output flow with less rotational speed of MG1 and much more torque overall. Very good description!
Hi, the design is more compact, lightweight, and allows for increased torque through the gear reduction with a lighter-smaller motor.
Great video. I watched an animated video years ago when we bought our 2010 prius. It illustrated the basic concept of how the system worked but left a lot to the imagination as to the actual mechanical setup. For me this video filled in the gap. Good stuff....
Glad to hear. Thanks for watching
Very good ! but I have to say, perhaps it is because of this rainy Sunday afternoon, but he threw me in the quickest and deepest sleep I ever experienced in my life...
Your explanations filled in a lot of the gaps in understanding I had after watching Niels Blaauw's excellent video. These two together cover the topic well.
Thank you John Kelly and Weber State University - a first class explanation.
Thank you!
Excellent explanation of the gen 3 gear set in the transaxle
Thank you!
Weber' your are only one i can get this information.. its is very important you to train or teach your knowledge to more people..
Great breakdown of the e-CVT!
Hi, that is a good question. I do not know the answer to it.
Excellent video! Question: Does an eCVT require any maintenance like fluid changes? If the car is high mileage (e.g. over 300,000km) and the fluid had never been changed, do you recommend to change it or at this point leave it as is? Thanks in advance.
Yes, every 193,000 km, change the fluid with Toyota WS fluid. Best wishes!
WeberAuto Is it safe to do even though it’s never been changed after clocking a high number of miles?
Thanks for the education! That is quite the mechanism! Enlightening even to a neophyte like me.
Great video. Nothing that can fail here. Compare to Hyundai ioniq hybrid where many things can fail.
So, just two main changes, aside from various sizing changes:
1- unitized, clutch assembly (non-serviceable friction plate)
2-dual plane planetary, with independent ratios for MG1/MG2
Did I miss anything?
As a neophyte to this design, I was looking for how the vehicle changes gears. Is it correct to say that gears don't need to be changed because the electric motors can operate at widely variable RPM, and the gas engine just helps out by charging the battery, and when needed for a power boost?
One question bugs me. When you hold one component of a planetary gear set solid and rotate another component, the third component responds. But it can respond with only so much force you hold the first component down, otherwise your hold breaks if the output has too high resistance. Now, with "holding down" replaced by electric motors, how is the force to set the car in motion transmitted to the output? How is such a great force resisted by the small MG1 or the infernal combustion engine so that the wheels get turned?
Question: Is it safe to change eCVT transmission fluid if it’s NEVER been done before (for a car which has exceeded 350,000km so far)???
Yes, just make sure you use the correct CVT fluid and set the fluid level properly. Best wishes!
@@WeberAuto Would you recommend or not changing the fluid at all on a car with 375000 miles. Or leave well enough alone?
@@clc2328 Yes, change it, but only with the factory fluid. Look how long it lasted.
Very nice way of demonstration , easy to understand the functions..... thank you so much.......
Thank you!
感恩了解，謝謝分享！
i do have prius 2013 2nd generation there is no energy flow and i have message saying hybrid sytem pr9blem message was inverter coolant pump i did change it but still the same problem can u please help me thanks
Have the car checked for trouble codes and go from there. If the pump was inoperative for too long, it may have overheated and damaged the inverter.
thanks
Thanks for taking the time to make a Long video...everything today is Rushed and just sucks because you end up missing details! I prefer videos like this, where it feels like you're in a REAL classroom and have time to absorb it! Good stuff!
Thank you!
That was so relaxing to watch for some reason. Oh, and really informative. We have a 3rd gen Prius and 3rd gen Highlander hybrid. Thx!
These late versions are much superior to the cone and pulley CVTs which most other cars have. There are no torque converters, gears meshing and un-meshing. None of those wear prone devices. Everything is “tight” at all times. That’s why these transmissions are so reliable.
I have observed and visualised one thing. From 26:38 MG1 is idling in reverse. To run the engine the MG1 field reduces its speed transferring the resisted ring gear motive force to turning the planetary,hence starting the engine which turns in a clockwise direction (in the video the engine is turning in the wrong direction). This confirms the namograph presentations upon running on MG2 and upon MG2 + engine. MG1 changes direction upon the engine running.
Kudzanai MG1 only changes direction with the engine running when the vehicle is stopped, otherwise, it will always rotate the same direction as the engine. Good catch on the entire presentation being shown with the components rotating the opposite direction as they should have been, It makes no difference in the theory of operation though (other than it is backwards). Thanks for watching.
WeberAuto Alright. I had taken it from your P111/P112 presentation, though i now notice MG2 forward has changed owing to the motor speed reduction gearset. You have a wonderful initiative (video lessons).
The IC motor (driving the planetary gear set) must rotate in the opposite direction from the electric motors (both driving sun gears). As the IC motor starts, MG2 must slow down, not speed up. You should re-edit the video to show this, including the IC motor driving the wheels with MG2 stopped.
very good explanation. that was a very good demo. I haven't a clue how it works. very good for Prius owners.
justin sincoise Thank you!
Great video! Watching this because i recently did a hard acceleration onto the freeway with my rav4 hybrid and was worried thinking it had a belt drive cvt.
Glad it helped! Thanks for watching
whats the problem of your rav4? i have same issues
Please keep making videos, very helpful and educational. Thank you!
Thank you!
regenerative braking ? release the acelarator cut's the power and turns it into a generator ? how does pressing the brake peddle cause further resistances from the generator's.
Yes, the rotors in the hybrid transaxle can be a drive motor or a generator, nothing else. You are either accelerating or decelerating. When decelerating, the spinning rotors with magnets inside of them induce current into the stator windings which creates a reverse polarity voltage and reverse magnetic field. This reverse magnetic field opposes the forward rotational direction of the rotor and makes it more difficult to rotate. This slows the vehicle (regenerative braking). When simply decelerating, only the large MG2 rotor slows the vehicle. When pressing on the brake pedal (or putting the transmission in the "B" position, both motors (MG1 and MG2) go into regenerative braking mode and slow the vehicle more quickly. Thanks for your feedback! have a good day.
Thanks for the video! I love my Gen II and my C. Amazing feats of engineering IMO.
Does the clutch ever wear out?
Great video! One item to note: at 26:09, you were pointing to MG2, but you said MG1.
Good catch, you are correct.
Love these Hybrid transaxle videos
Thank you
Thanks for this great video. This makes many things clear!
I think you made a mistake in the description of the transition of MG2 drive to ICE drive (27:00): You turn the ICE clutch damper in the wrong direction so that MG1 will turn faster (obviously too fast if it´s already a bit quicker than MG2). Actually MG1 will turn slower (breaking as a generator) to start moving the ICE in the SAME direction as the wheelgear already rotates. At eahart.com/prius/psd/ this is well demonstrated with the shown nomograph. Moreover at higher speeds there is a point where MG1 stops spinning and reverses direction.
Remarkable difference to 2nd generation PSD: In normal forward drive the ICE and MG2 rotate in reverse directions! This is caused by the additional planetary gear set in gen. 3.
seriously ! chump
Yes, when the vehicle is in good forward motion and the Internal Combustion Engine (ICE) is to be started, the rotational speed of MG1 is decreased by applying a breaking force by means of electric current to MG1 from an electric converter. At low forward (or reverse) motion of the vehicle, or high rotational speed (RPM) of the ICE, MG1 reverses rotational direction. In 4th. generation Prius, MG2 is no longer coaxial with MG1 and the ICE. I'm unsure as to whether MG2 employs a planetary gear set or not in 4th. generation Prius.
I have something haven't understood yet. When both ICE and MG2 are spinning, if MG1 (sun gear) without any resistance, the ICE is also spinning freely, they can't output power together.
So I think the power consumption from MG1 (when act as a generator) is the source of MG1's resistance.
But if the battery is full and I want to full acceleration, which device can consume MG1's energy? MG2?
If the battery is empty, does the eCVT just like MG2 connect to MG1 phase to phase?
outoflegend Hi, MG2 consumes power generated by MG1 and from the battery. If the HV battery is low, the ICE can power MG1 to generate more power to feed MG2 and/or charge the HV battery. The charge rate of MG1 can be increased or decreased as necessary dependent upon driving mode (EV only, or combined EV and ICE). Even if the HV battery were completely charged, the current draw required to power MG2 under full acceleration is always greater than MG1 can generate, so the battery must also supply current. I hope I answered your question.
WeberAuto Very helpful. Thank you very much!
should i change my ecvt fluid now ? i have camry 2015 hybrid with 60k miles , some people say not to change soem people say to change , idk what t odo
My one is 2016 and I'm wondering whether have to change the transmission fluid.Just looking about advice.
Very nice explanation. And a very reliable design compared to automatic and cvt transmissions.
plz answer me . when you put gear shift at B position ,the generator drive the thermal engine and the engine applies torque to electric motor . So how to reduce the vehicle speed while the electric motor is still applied the torque ( electric motor connect to the wheels )?
The motor applies negative torque which slows the vehicle. See th-cam.com/video/dC_Qvs_scT0/w-d-xo.html
Great explanation, excellent information to understand how to work the e-cvt transmission. Congratulations!!
@WeberAuto
Dear Professor Kelly, I have 2 questions please:
How is the lubrication implemented? Is it splash lubrication? I see several caged, open deep groove ball bearings and I assume the planet gears use needle bearings.
2) I know Toyota WS (World Standard) ATF is used. How well does the lubrication work at cold temperatures? With the car stationary and the ICE idling high (1300rpm because warm-up), MG1 spins at ~4750rpm. When moving at 50mph, MG2 already spins at ~6000rpm. What if the car sat outside in winter at 5-10°F? Does the lubrication still work reliably? Would it maybe be a good idea to drive a bit slower during the first few miles?
I could not find a PID for ATF temperature to monitor how long it takes to warm up.
Thank you!
Regards
Dan
As demonstrated, I didn't see any direct mechanical connection between the ICE and the final drive. Is the ICE only used to drive MG1 to generate electricity that drives MG2 which drives the vehicle?
+Leo M. Mara There is no direct mechanical coupling between ICE and final drive. That is why it is a type of eCVT...Infact, there are different modes of operation as was explained in another video by John on working of Prius 2nd Gen...I have explained some cases...1) When power demand is below a certain threshold and battery has sufficient charge (SOC), battery powers MG1 which drives MG2 and intern final drive...2) When power demand is below a certain threshold and battery has low charge, MG1 will act as a starter for ICE and subsequently when ICE starts, it acts as alternator and charges high voltage battery...3) When the power demand exceeds a certain threshold, power split device based on the control strategies of the Hybrid controller varies the speed of the ICE and MG1 in a ratio (depending fully on the planetary gears ratios) such that torque produced by ICE is used to assist MG2 in providing power demanded by driver while remaining torque drives MG1 which acts as a generator and charges high voltage battery...Sorry for the long explanation...Hope that helps you!
Leo M. Mara just an FYI...in a normal automatic front wheel drive there is no direct connection either (the magic happens in a torque converter) :)
If the ICE is running and you hold both MGs stopped then the ICE will drive the vehicle. If there were brakes on the MGs then you could actually do that, but there aren't, so it would take electrical power to hold them stopped. So it's better to let one MG spin (MG1) and brake it electrically by generating power and use that power to spin MG2 slowly forwards (increase the road speed) or backwards (decrease the road speed). Er, I think :-)
After watching one part more carefully (and the 4th gen Prius teardown) it's become clear that you can't have MG2 stopped while the vehicle is moving. The 2nd planetary gear set isn't being used as a 3-shaft mixer as you'd expect (and as the 1st planetary gear set is) -- in fact the planet carrier is fixed (that's what the vicegrips were being used for in the video) which makes it a simple reduction gear between MG2 and the output shaft to the wheels. This is more clear in the 4th gen video, where a simple conventional geartrain with one intermediate shaft is used between MG2 and the output drive to the diff&wheels. So MG2 always spins at a speed proportional to the vehicle speed.
Clutch I think on the 400H might cost thousands, if I don't do it my self. Easy but time consuming. Patience along with all the good info to try swap transfer should be easier specially if I'm not sure what part is wrong like a pin bearing or final drive gear in power split or burnt coils or clutch. Soon as engine comes on its like a broken piston ring bit goes n comes back. Might just be bad gas clogged injector or coil n plugs are toast it looks like. I was driving Ving fast yesterday so I think clutch because it had new oil change. Thanks for the videos top notch
This was absolutely fascinating
Thank you
can you please explain to me the drive train of the 2015 prius, is it a electric motor that powers the wheels? and the reverse is only powwered by electric, not the cvt. I dont get it
+djclown7pb
hi, this is the explanation. Reverse or forward can be electric only or a combination of electric and gasoline engine. Thanks for watching!
Weber Inst. Thanks a lot for the videos.. they are very usefull for us, people in the third world where innovations arrive a little late but unfortunely the tecnology for repair it is only for a little groups that prefer to hidden it and be only with the truth. Thanks to you and your org. we can have a better understanding for accomlish the repair labor.
In case of electrical vehicles it will be necessary to develop an a very simple way to detect failures with help of a multimeter because other devces are or impossible to get them or innoperable due to lack of escolar education in the electrical area and in the mechanical. thanks once again...
Excellent piece of engineering.
Those oil pumps you showed are only for the transaxle, correct? I'm also confused why the MG2/MG2 can spin so high on PriusV (P410) but the internal combustion engine kicks on at a very low speed (like, 15 MPH) with the warning that you're going too fast for EV mode. The plugin version has *about* the same RPM limits as the MG1/MG2 P410, at least that's what it sounds like you said.
Hello John, Thank you for this video as I/we just purchased our second Prius (2010) which is a 3rd Gen. Our first one is a 2nd Gen. We have a friend who also had the 2nd Gen...but (supposedly, according to HER mechanic) the Transmission FAILED (she only had @145k miles on it). That didn't seem plausible being THAT it is a CVT, however MAYBE I need to learn something. In your experience....are the 2nd Gens prone to FAILURE, and if so, How So ? I ask this because on our newest one....I'm considering CHANGING THE TRANS-FLUID as it just now turned 100k miles. In looking up the Fluids for both Gens, I noticed that the fluid for our 2nd Gen (which is a 2004 model) may actually use a DIFFERENT FLUID than the 3rd Gen (both are RATED Toyota WS, howEVER, Valvoline Synthetic Trans Fluid (also with WS Rating) shows that theirs can only be used in the 3rd Gen CVT. Can you clarify for me ? (thanks for letting us know that the 2nd Gen CVT uses a Chain-Drive vs. the Gear Drive.....does this also mean that the 3rd Gen CVT is Superior, partly because of this ? ) Also, one last thing, some people think....yes EVEN SOME TECHNICIANS...that because the Toyota CVT is a "sealed unit" that it does NOT require the changing of the fluid. What say Ye, Ole Master Tech ??? Thanks again.
+ConnectTheDotsNOW Hi, No, the 2nd generation transaxles have been very reliable. I wonder what "Failed"? Unless there was a fluid leak leading to oil starvation at the bearings or physical damage from running over something, there is very little that can fail. As you know, all generations of Prius transaxles are not sealed units. There is a fluid fill and drain plug. All of the "sealed transmission" stuff is just a marketing ploy to trick people into purchasing their vehicles that don't require service under "Normal" circumstances. See your maintenance guide, there is a fluid change interval. The WS fluid is compatible with all 2004 and newer Toyota transaxles. I don't know why Valvoline would say that if their fluid meets the WS specification. Best wishes!
How does that get connected electrically? I don't see any connections on MG1/MG2
The electrical connections are on the stators.
What transaxle is on 2020 Corolla Hybrid?
P710. See th-cam.com/video/O61WihMRdjM/w-d-xo.html
What happens when you hold MG1 still and turn the ICE? In your demo all 3 motors are spinning the same direction. ICE causes MG1 to spin faster in the same direction. MG2 causes MG1 to spin faster in the same direction. MG2+ICE spinning in the same direction show MG1 spinning crazy fast in the same direction. Shouldn't one of these spin the opposite direction?
I wish I could find a video that shows not just gear ratios, but also power distribution. Like, how does increasing the engine RPM actually make the car go faster instead of just spinning the electric motors? When I look at my Torque app MG1 actually spins backwards until I rev the engine. At highway speeds MG1 is usually close to 0 RPM while ICE as at 2500 and MG2 is at 10,000 or so. The Torque app will show -20 ft-lbs of torque at MG1 (0 rpm still) Obviously you can't use the battery to apply constant resistance to the MG to redirect ICE power to the wheels because the battery would run out of power. Amperage to the HV battery system usually is around 0. (negative amps = charge) So I'm guessing the MG1 spinning in generator mode is used to power MG2, and the resistance created in MG1 is used to force the ICE power into the final drive. Then, breaking is still confusing. I think MG2 generates while MG1 is free-spinning. I guess that's the most difficult spot to visualize is which MG are free-spinning vs which ones are generating power and which are using power. Sorry for the streaming brain dump.
When the ICE is only rotating, the vehicle is not moving @27:40 th-cam.com/video/dLNDGUISTYM/w-d-xo.html
MG1 is attached to the sun gear, so it can control where the motor power goes. In another video, he says that for the car to operate at 65 MPH, the ICE can spin at 3300 RPMs with MG1 matching speed, or the ICE can spin at 2200 RPMs and MG1 can be stationary. Since MG1 controls the sun gear, it being stationary would push all engine power to the ring gears and then the wheels. MG1 can be free-spinning to generate electricity, or it can be given power to transfer engine power to MG2 and then the wheels.
Perhaps the concept that either of the motors can apply torque in either direction, so they may appear to be freely spinning, but the system can apply torque both in the direction of rotation (adding speed) or in the opposite direction (braking or generating) giving whatever control output is required.
Wow, great illustration of hybrid synergy drive. I have the Prius Plugin. Now I understand how this works,it gives me a piece of mind that it will last for a long long time! With this explanation, I can see why the Prius Prime evolved the same pathway to even higher electric only speed with the same concept. No wonder it is so reliable. By evolution road proven approach, you have real life test runs already done instead of revolutionary method that needs to be take a good time proven initially to get it right.
Thanks for the feedback. Here is a new series on all four generations of Toyota hybrid transaxles. th-cam.com/play/PLIn3FrDiB1lyzmzZNBM24V_FsyuDx8ow_.html Have a good day!
Thank you for.your explanation was considering purchasing a gen 2 from 2009......but will hold off and purchase a gen 3.....looks like a more efficient and durable design.......
I agree, Thanks for your feedback
Really interesting explanation! What is the exact purpose of the oil pump, since this transmission has no metallic belts (Nissan, Toyota) or chains (Audi, Subaru)? Heat dissipation?
Yes, to circulate the fluid for cooling the stator assemblies as well as a small amount for bearing lubrication. Thanks for the feedback!
Why does it use a clutch plate? Is it just so that it can be made from mass produced components?
No, it allows small amounts slippage under certain conditions (like engine shut down)
The first generation manual calls it a "torque limiter." There is a DTC thrown if it slips in operation, but I don't recall what it is.
I’m curious to know what other options are available. If I had to guess I’d say the bottom line dictated it’s implementation. Damn I’m smart
good work Weber, this is hard information to find. I watched your whole video at regular speed and found it informative but i wish you'd work on your presentation a bit better as i didn't think to use 2x speed.
Thanks for watching!
Why does the flywheel at the back have gear teeth when the Prius does not have a conventional starter? Why do they have a clutch plate is it a cheap way to incorporate a damper?
So is the clutch what allows the gasoline engine to run with the wheels stopped? Or is the planet carrier spinning with the sun gear but the ring gear is still?
Question for you, I was showing my dad this video, he was explaining to me that there's still a belt or chain used.
I'm confused, can you help me out here?
Absolutely great video! I've got P314 in my Toyota Harrier 2015. This helps a lot to understand what is going on under the hood! Huge thanks!
hello!
i have a problem: I a bought a toyota prius V with seven seats used at taxi and it has 205000 miles... after thermic engine starts the transimision shake at a constant speed like about 40-50mph, it shakes and seems like clutch inside not pressed enough, but if i press the acceleration harder it works well...
I would like to know what could be the problem because the motor mointing rubered holders are replaced and are brand new.
thank you!
jacob
If the engine is misfiring or not running correctly, the damper springs on the torque limiting clutch disc will oscillate causing a terrible noise and vibration.
WeberAuto thank you so much fot the answer! It means the damper disc and it s springs are exausted, i should buy a new one. 31270-47060 is the code..."Damper assy transmission input" And just in case i remove the inverter it resets the hybrid system and than needs softwate service to set it?
That is a possibility, but any engine misfire will cause the same rattle.
In reference to ToyotaKTM, possibly Toyota Engineering wanted to use a starter motor on the original ICE. So, they ordered the ring gear on the flywheel. Then, at some later point, the starter was eliminated. The other theory could be that this flywheel is a multi-purpose flywheel that can be used in another vehicle, not propriety to Prius. I saw the ring gear on the flywheel and questioned the same thing.
What's the difference in the Lexus Hybrid transaxles?
in many nothing; some new have another fixed first gear for faster take off an a stop light. But i think that belongs to Toyotas too; in the end its all Toyota. My Lexus RX Hybridhave a V6 Hybrid and 2 e Motors for AWD running 200km/H max. The same powertrain with 1 e motor (no AWD) in the GS450H runs 250km/H because its e-cvt have 1 overdrive stage to reduced rpm´s from e-motor and so car can reach higher max speed.
Dear Prof. , Why 1-3 rd Generation Prius has only 0 towing capacity but 4th generation 750 Kg? Is there any significant cooling in these generations?
Hey Prof. I'm trying to figure out the service regimes for the highlander and Prius. After how long should one flush the coolant, WS transmission fluid and engine oil in equatorial climate? Thanks
Nice presentation.
Thank you!
Thanks for the very informative video!
I have a couple questions if you don't mind... What kind of motors are MG1 and MG2? DC brushless? Also, what holds the ICE stationary when in pure electric mode? Is there some sort of brake band?
Awesome video. Thank you for the clear and simple to understand explanation. Question: does the prius plug-in use the same transaxle?
+Arlen Ung Hi, no, the plug-in transaxle is very similar, but has different gear ratios to allow the engine to stay off until 61.5 mph rather than 40 mph. Thanks for watching.
question why would my gen 2 03 prius have problems climbing steep hills would that be
related to a bad battery? just curious
Yes, it is possible, but the design of the transaxle gives it lower torque than the third generation models. The 2nd gen models only has 4.113 rotations of MG2 for each revolution of the tire. The 3rd gen models have 8.615 rotations of MG2 for each revolution of the tire. Almost twice the torque.
thanks for that information ,,
i picked up my car today from Kauai community collage The shop teacher said he had never seen the Hybrid batteries arch like mine .
two batteries turned out bad because they had arched , the car runs like new now , well worth the 1200 spent..at the collage and i let the students actually learn something using my car , so it is good karma i think,
What about the new 2019 and up Toyota’s are they similar of this setup
Yes, but laid out in a different configuration
@@WeberAuto thnx would you prefer the Toyota over the Chevy system
What happens when the IC engine stalls at high vehicle speed? Will MG1 then also over speed and break?
It will overspeed for sure! It may break as well. Thanks for your feedback!
@@WeberAuto Maybe exactly at that moment clutch mechanism comes into play? It disconnects from an engine in order to slow down MG1. What do you think?
Hi this is a great video, one thing I’m curious about is what happens when you over speed the motors, such as what harm does it do?
You risk beating failure from overheating and inadequate lubrication
Thanks a lot for this great Video, very, very illustrative.. Them no dudes !!
Thank you!
Awesome video thank you.
Thank you!
Oil should be changed in P410 transaxle? Thank you
What happen if the clutch is worn out?
is it possible to change this e-cvt transmission to a ZF gearbox ?
no
So what car years are these 2ng gen and 3rd gen CVT ? Which CVT is in the 2006 Prius and which is in the 2010+ Prius?( the one with indicators in the mirrors and keyless go.)