I love how the narrator says that this may not apply to your Toyota while I'm just over here with an '89 Camry just wanting to know how the Atkinson cycle engine works
If you want to know how it works then this isn’t the video for you. Toyota is good at lying. My Tacoma had an “auto lsd” according to Toyota, except it was an open diff that absolutely nothing to limit slip automatically. It was traction control. It had a no slip mode called a locker, but the auto lsd button was pure false advertising.
@@KTMcaptain some cars apply the brakes to the slipping wheel so power is directed to the wheel with more traction, which behaves like a LSD. Volkswagen calls it a Virtual Locking Differential in their cars. That's probably what your Tacoma has.
@@barnsnoble7066 my point is that calling it a limited slip diff is false. The diff does nothing to limit slip or bias torque. I also drive a Gladiator Rubicon not a Tacoma. Got rid of that thing a year after I bought it cause it was always in the dealer getting repaired and just unimpressed me.
@@mihailpetrovici5044 yep thatd be the Atkinson cycle for you, funky valve timing to force fresh fuel/air mix back up the inlet resulting in less fuel/air being burned and so better economy. I have probably explained something wrong as I am not an expert but I think I've reiterated what the lady said.
@@benedictroberts678 no, the exhaust valve didn't opened at the right time, if you look the piston compressed the air again and as it came down it opened tge exhaust valve as it was an intake stroke
@@benedictroberts678 the pistons goes up, intake closes late, the compression is done, the conbustion starts, the piston is pushed down, and then, when the piston come up the exhaust valve should open to let gas out, instead, it compresed that air again without any reason
If the Intake valve remains open longer and the Air & Fuel mixture goes back to the intake manifold, I believe that's why the EGR on the 3rd gen prius get clogged up and the throttle plate on the second gen Prius gets filled with gunk. What ya'll think?
Egr can be a dirty setup in any design. In the 60s they told owners use the best fuel available. After emissions regs in the 70s unleaded fuel caused the invention of egr or feeding the engine it's own waste in an attempt to make crap fuel burn properly. One way to fix dirty egr problems is designing it to feed the gases from the rear of the catalytic converter instead of in the exhaust side of the head or manifold. The catalyst acts as an egr filter before it gets fed back through the intake. This cleans everything up causing a lot less gunk to build up throughout the egr system and intake.
@@chongweilee5903 Probably makes it worse actually, the gasoline actually helps keep the intake clean by acting as a solvent. It's oil vapours from the cylinder wall that clog things up.
@@chongweilee5903 how direct injection have anything to do outside of the combustion chamber ? DI have made it way worst ! why do DM car manufacturers does return to the port injection ?? cleaning the valve, maintaining the sealing in a longer span of time etc...
that's how the GS F gets 8l/100km. mind-blowing use of technology. what surprises me is that the fuel air mixture stored in the intake manifold isn't strong enough to clean the valves in case of direct injection (only) engines... thus making the d4s necessary...
@@benjaminsmith-haddon7316 for a brick shaped car that’s not a hybrid? Yes. I was on this comment to say my 20 corolla get’s like 50 highway but combined it’s getting like 39.
@@benjaminsmith-haddon7316 Find me another AWD mid 4,000 lb SUV that will get 41 mpg on the interstate and up to 44 mpg around town. Those are industry best numbers for an AWD mid size SUV Russ
right?! I was looking at the exhaust valve like... are you not going to explain why that's CLOSED on your exhaust stroke or? Cuz that looks like a pretty *interesting* feature of your 'atkinson cycle'..
I am glad I wasn't the only one who saw that. I was extremely confused. I had to watch it 3 times, because I thought something was off, but my brain didn't catch it right off. I thought VW was the only one playing with the 6 stroke (water injection) cycle, and I thought they wrote it off as a complete waste.
1:32 - 1:40 Shouldn't the exhaust valve open at the upstroke? By opening the exhaust valves on the following downstroke, air would be pulled in through the exhaust manifold. What should have been: suck, squeeze, bang, blow, is here : suck, squeeze, bang, squeeze, (whatever happens on this downstroke), blow. This animation is seriously f***ed up, unless Toyota invented a 6-stroke engine...
I drive a 2018 Tacoma 3.5 and I can tell on the highway I loose power . So like it’s a flat road at 70 mph and I have the gas pedal at a certain point then if I need to speed up just a little I only have to push the pedal a tiny bit. It doesn’t down shift to 5 gear it just feels like it’s got power. Then all of the sudden with out any reason as to why it changes it . It looses power like not a lot but it would be like a strong head wind is blowing or you have a small trailer behind you . The truck feels sluggish you have to push it harder just to maintain speeds constantly downshifting to 5th from only the slightest of inclines . I swear it’s more efficient in the normal Otto cycle than the other. Maybe there’s something to it. I average 2000 miles a month getting 22 mpg with a 2wd trd crew cab. Once I hit 100k I might be looking at a different brand .
The nonlinear throttle control and transmission programming have a lot to do with it. I have a manual transmission Tacoma which makes it easier to understand the engine's response in isolation. The 2GR-FKS can deliver plenty of torque at 1800-2200 rpm, but it takes a while (a couple seconds) to build power, presumably because it has to switch from Atkinson to Otto mode which does take time. The additional intake noise (sounds throaty) at low to moderate load is how you know it's in Atkinson mode because the throttle is left open to reduce losses while "throttle" control is performed by varying the intake duration. To get to Otto mode, the ECU must close the throttle and shift the valve timing while keeping the mixture on-target between the port and direct fuel injection systems. There's a lot going on in this engine, and I imagine that getting the transition from low to high torque at low RPM is very challenging to manage quickly and/or seamlessly. When you consider that they're basically accomplishing a form of variable displacement without cylinder deactivation and without brute-force turbocharging, it's amazing it works as well as it does. I can drive my commute without exiting Atkinson mode and consistently get above the sticker MPG. Do I wish the throttle response were quicker? Absolutely. There are tunes available for the 3.5 that the TacomaWorld folks swear by to improve the low-end response of the engine.
The animation didn’t help me understand the difference as much as I hoped it would. It seems that the Atkinson cycle wastes fuel when it allows the fuel air mix to pump backwards into the intake.
They might call this an Atkinson cycle engine but a true Atkinson cycle motor uses a linked crankshaft to mechanically shorten every other piston stroke. This means it only breathes 1 way through the intake valve and does not waste rotational momentum. This style [As described by Toyota] results in a very contaminated intake path with combustion remnants, oil from cylinder walls and excess heat in the intake path. This will cause problems with carbon fallout in the intake path, contaminating inlet ports and valves, also EGR and PCV contamination. Throttle bodies and sensors linked to the intake system can also suffer from contamination. Because of the heat any remaining fuel tends to remain in a form where it will be able to return to the cylinders but the oil and carbon fall out and turn into a hard tar like substance.
The Atkinson cycle engine is a specific patented engine design with a mechanically different compression and power strokes. The Atkinson cycle is just a thermodynamic principle that can be implemented by numerous different engine designs. The thermal cycle only pertains to what is happening to the gases inside the engine, not how the mechanical components are designed to achieve that. Same way there was an original "Otto engine" that doesn't look anything like our modern "Otto cycle" gasoline engines. Most manufacturers with continuously variably valve lift technology implement the Atkinson cycle to some extent (like for example limiting the intake valve opening time which achieves the same as keeping it open during part of the compression stroke).
I once rented 2001 Corolla and it was quick off the line but god forbid you ever want accelerate while part way up a hill. My usual car was a Chrysler with a 3 liter V6 and was fun to drive too. I am just glad the Corolla was not mine and I would be rid of it soon enough. Even the 2002 Neon I bought after the Chrysler felt quicker. It had a 2 liter 132 HP 4 cylinder that is somewhat similar to the 1.8 in that Corolla. The difference was that the Neon was more willing to accelerate on a highway road with a noticeable grade (while already moving), the Corolla would have none of it! It would be a true surprise to me to drive a 4 cylinder Toyota these days and see if they got any better (other than having CVTs). Sure Japanese cars are reliable but with some of them being ugly and boring it doesn't help their case when it comes to making me want one. For one it has to be able to get out of its own way, that Corolla couldn't do it to save the world!
For lack of acceleration the winner was a 1200 cc side-valve 1949 Triumph Mayflower, even on the flat you could nor feel it. Every up slope required down shifting, sometimes ordinary roads were too steep. British cars were not all that bad but it was a harbinger for today. They did look good and were as solid as a brick outhouse.
The next stage of hybrid is complete control of valving timing, generating, motoring consistent with optimum engine efficiency and road condition by fast acting chips. Such control would reduce many mechanical parts.
Same compression as Otto engines, but with longer strokes like Diesel engines. I actually like this concept. I drive a lot and I spend a lot on fuel. This wouldn’t provide life changing savings, but it’s a step forward.
It's not a longer stroke, it's a reduced volume of air being compressed, because the air isn't compressed as soon their is less parasotic resistance in the engine. You're also burning less air and fuel but in the same confined space. The part I don't get is reduced compression reduces efficiency which is why this engine doesn't get the MPG gains it should to make the Atkinson worth it. That reduced compression is why it has no power. If they increased the static CR before introducing the cycle I wonder if I would be possible to even that out, but then there are changes to everythings physics when one feature changes so idk
So if using direct injection is this still needed ? Because DI motors can have higher compression or longer strokes with no chance of pre-ignition, the intake stroke brings in nothing but air. I was looking at the kia niro, it gets better gas mileage then the prius and other Atkinson cycle toyotas, but it uses a non atkinson motor, just a plain 4 cylinder, 13:1 compression with direct injection.
it makes the compression time shorter, so the useful compression stroke is not the full value. This makes the expansion stroke still being 100% of the basic design longer than the now shortened effective compression stroke. Expansion stroke is unchanged. Compression stroke active length has been reduced.
Those air and fuel mixture will going into another cylinder instead. They're savinv fuel by using the mixture from the other cylinder for the next and keep go on. Nobair amd fuel going to waste since it going to the intake manifold which eventually will ending up inbthe combustion chamber
Could someone help me understand this? What's the point if some fuel gets pushed back into the intake? Now you're wasting fuel and the computer has no way of accurately measuring the fuel:air ratio for the next combustion cycle. I genuinely don't understand how this is MORE efficient
Yeah it is underpowered. I made the mistake of trading my 16 Frontier for a 19 Tacoma because I was brainwashed about reliability. The 16 Frontier never gave me problems and it had way more power too and was immensely fun to drive. Now I drive this Tacoma and wonder if the thing can make it up the next hill.
I think certain people should work in this field before you start sizing up Reliablilty . I have a '23 Tacoma and that thing Runs perfectly fine for my taste and can take a hill with 0 problems. The 04 Tacoma I had was very underpowered, but that Engine will run for a lifetime! I don't understand what some of you people want or expect. Toyota buyers know what they want and what to expect. Sometimes I just don't get it. Did you not test drive the truck before hand? Geez
Sooooo on hybrids they are just expelling some of the air and fuel the engine putted in before, wouldn't that be just downsizing but with more steps? And doing it less efficiently
Except it doesn't make half the power. Watch the video, and you will learn that the Atkinson cycle is disabled under high load. Also, I think you don't know what the word "efficient" means.
@@specialopsdave Except it won't double the fuel economy either. In real life Toyota engines are not more fuel efficient than their competitors. That's why this modification is not widely used in other vehicles.
@@specialopsdave especially of a system or machine) achieving maximum productivity with minimum wasted effort or expense is the definition of efficiency So yeah an engine that puts out less power but uses more fuel is not efficient An engine that’s used less gas and makes more power is efficient Your backwards bro
@@aircraftnut15 So you're saying that the atkinson cycle increases fuel consumption? No, it doesn't. It reduces fuel consumption by 30% while reducing power output by 25%, meaning if you *increase throttle* so the engine outputs *the same power,* it will consume approximately 5% *less fuel for the EXACT SAME HORSEPOWER.* It's only when you near 100% throttle that the lower power output would become noticible, but by that point, Atkinson cycle has already turned itself off, and the engine is running a conventional engine cycle.
Rica etsem altyazılardaki otomatik çeviri seçenekleri arasına ‘Türkçe’ dil seçeneğini de ekleyebilir misiniz? Sizi anlamak ve takip etmek istiyorum !!!
Yes, the engines run on the atkinson cycle when demand for power is low. Once demand for power is needed (you floor it) the see engine runs on the otto cycle.
I remember when mom got a little toyota paseo. It advertised 100 hp and it was very small. That would have been 1990(ish). I bet the mpg was pretty good on that thing. I had just started driving and I beat the hell out of it lol
Rotary engine in automobiles refers to the Wankel engine which, to my knowledge, Toyota has never produced. I had a rotary-engined Mazda long ago and it was junk. Worst car I have ever owned.
With Toyota's infinite wisdom,,,, Toyota engineers, can you make a pickup frame not rust out so fast and the truck snap in two ? ? ? Can you also make the bodies not rust so fast ? ? ?
my brothers bed fell off within a year brand new... not from rust but he lives where there are only dirt roads and just couldn't handle the continuous shaking.
Trucks are used in adverse conditions and when you scratch the paint down to the metal the steel will rust on any vehicle. To the design challenge, why don't they just offer an option for stainless steel or aluminum body panels for and extra 2 grand? For people in the rust belt it would be well worth it and the resale value would be head and shoulders above anyone else. The only reason I got rid of my last car was due to rust or I would be driving it 15 years or more. IMO I think they keep fooling themselves into thinking this years "new coating" will keep it rust free for way longer than it actually will. Kind of the same way roof shingles keep changing formulations and say "30-year shingles" and now fiberglass shingles but it is all the same tar crap that lasts half that at best and the consumer has to buy and replace again and again.
These Engines have Both Direct Injection and Port injection to help with these problems.They switch on and off through different modes depending on driving habits.From a mechanics standpoint point I have seen that this design does its job and works very well. If you are familiar with how Toyota Engineers things, they have pretty much worked out the bugs with this design. Keep in mind that Toyota Pioneers a lot of mechaical designs and sells those ideas to other manufacturers . Toyota also doesn't give up on their innovations either. They keep churning them out while perfecting them in the process.
Adopt this method while drinking and your beverage will last longer. When you tilt the cup/can/glass back, spit some back out after every drink. So that's why priuses are so fcking slow, they "backwash" the stuff needed to make power out of the cylinder
Pretty much without exception, internal combustion engines expend 80% of the energy put in, as heat thrown out. A really efficient boiler for a home, manages 93%. Therefore, every gasoline engine is a modestly good boiler. But, a terrible way to turn a shaft, only expending 20% of what went in, to do so. Now, throw all that manufacturers and big oil companies have told you, to one side, and ask this question of anything they build, design, or ‘crack’ to do with internal combustion engines: Does this enable an internal combustion engine, to beat 20% efficiency? This is all that matters. Novel designs like rotary engines, boxers, v-engines, etc etc, nothing has ever beaten this measure of energy in/energy out (at a shaft). I have literally bought a hybrid over an EV, because in our northern climate, it’s a great way to keep warm, it’s *that* inefficient…yet, this is efficient for my needs, 3/4 of the year. I used to get excited when people said a special new design or implementation of an ICE had been produced, now I feel a little resigned. But, there’s great news, I can literally tell you how to save gasoline engines, and yet nobody will rush to do it: harness a lot of that lost energy/heat, by a micro-steam-turbine system, use it to charge a hybrid battery. This, would work. It is the only way that ICE could legitimately remain even while we treat the ecology and pollution as priorities. But don’t hold your breath, despite the fact huge steam turbines are the workhorse of nuclear power plants generating electricity at massive scale, micro systems have very little research. Why not? Your guess is as good as mine. Take care and be at peace.
Not true. I get 22 mpg on the interstate with heavier AT's running 80 mph in my 2021. I get 16 to 18 in town, stop and go driving, and I drive pretty aggressively. Power is there when I need it, it just likes RPM's unlike my 5.7 Silverado.
This isn’t an Atkinson cycle, it’s VVT. The Atkinson cycle as proposed by James Atkinson literally hinges on a piston connected to a a crankshaft via a double pivot linkage. An Atkinson completes the Otto’s 4 stroke cycle in one cycle or Revolution off the crankshaft. Toyota stop lying.
So why not using smaller otto engine!? I can’t understand the benefit of that Atkinson 🤷♂️, it is 2.0 engine using fuel like in 1.8 or smaller but the power is less than 2.0 and 1.8 😵💫😵💫😵💫.
dumb, yea! less power! so you have the piston pushing air and fuel back into the intake. all these years I've heard about these engines, I thought it was some super tech going on, just more things to go wrong as they age. guess that's why the Mazda Millenia never took off
Less power unless you apply throttle requesting more power, when it switches to otto cycle And if you think intake manifolds can't handle fuel, you clearly don't understand engines or their history. By "something to go wrong", you mean the VVT used to do this which is otherwise present in almost every modern vehicle ever
It sounds like a lot of extra complexity in the name of dubious gains. How much fuel does this really save while it's spitting cylinder gunk back into the intake and a bunch of intake sensors? Any engineer will tell you that complexity is the enemy of reliability.
@@confidentlocal8600 I'd take neither. Those manic little turbocharged litre engines are highly stressed, not a recipe for reliability. My answer to all that is something along the lines of the 1UZ.
Turbos are not very reliable, as we Know , that is what Toyota is known for....Reliablilty. Besides, this Engine has Port Injection and Direct Injection so remedy these carboning issues. These Engine Managment is wiser than u might think. Toyota really thought these through. Coming from a 20+ years as a Mechanic, I will tell you that I will take a Toyota any day over the Domestic garbage that is produced. Reliablilty is what these designs are all about.
I dont see the point of having the atkinson cycle engine in hybrid vehicle that cannot switch to otto cycle, you could instead have a engine with low CC, which in same way gives low power and high fuel efficiency
If you've come this far while nerding on the automotive industry, you know that you cannot be amended.
Maybe but I ain't even mad.
Well I am a mechanical engineer 😂
What a bs...
I love how the narrator says that this may not apply to your Toyota while I'm just over here with an '89 Camry just wanting to know how the Atkinson cycle engine works
Yeah, I’m pretty sure it doesn’t apply to my 1990 MR2 Turbo either. Fuel efficiency isn’t its strongest point.
If you want to know how it works then this isn’t the video for you. Toyota is good at lying. My Tacoma had an “auto lsd” according to Toyota, except it was an open diff that absolutely nothing to limit slip automatically. It was traction control. It had a no slip mode called a locker, but the auto lsd button was pure false advertising.
@@KTMcaptain some cars apply the brakes to the slipping wheel so power is directed to the wheel with more traction, which behaves like a LSD. Volkswagen calls it a Virtual Locking Differential in their cars. That's probably what your Tacoma has.
@@barnsnoble7066 my point is that calling it a limited slip diff is false. The diff does nothing to limit slip or bias torque. I also drive a Gladiator Rubicon not a Tacoma. Got rid of that thing a year after I bought it cause it was always in the dealer getting repaired and just unimpressed me.
@@barnsnoble7066 yes and Volvo did the same thing and called it TRACS. (from the 850 onwards)
Translation: "The valve timing is fucky"
Look at the 1:35 the damn engine forgets to evacuate gases
@@mihailpetrovici5044 yep thatd be the Atkinson cycle for you, funky valve timing to force fresh fuel/air mix back up the inlet resulting in less fuel/air being burned and so better economy.
I have probably explained something wrong as I am not an expert but I think I've reiterated what the lady said.
@@benedictroberts678 no, the exhaust valve didn't opened at the right time, if you look the piston compressed the air again and as it came down it opened tge exhaust valve as it was an intake stroke
@@mihailpetrovici5044 I don't think I'm seeing it.
You mean the exhaust valve opening before the piston is at bottom dead centre?
@@benedictroberts678 the pistons goes up, intake closes late, the compression is done, the conbustion starts, the piston is pushed down, and then, when the piston come up the exhaust valve should open to let gas out, instead, it compresed that air again without any reason
So its basically an otto motor, with a long duration intake lobe
The one they use, yeah, but is just a simulated atkinson. Real atkinsons are different.
Otto motor with atkinson cycle.
Exactly!
There's no Otto engine or Atkinson engine, but there are several cycles by which an internal combustion engine produces power.
Variable duration is a better description
Is it 6 stroke cycle showed o this animation? Or it's something wrong with me? 😵
I was wondering that too
The animation isn't great; its still a 4 stroke.
The animation is fucked🤣
Yes the v6 is a Tacoma engine for demonstration purposes.
@@turblown I feel like you've got the combustion cycle and the number of cylinders mixed up
If the Intake valve remains open longer and the Air & Fuel mixture goes back to the intake manifold, I believe that's why the EGR on the 3rd gen prius get clogged up and the throttle plate on the second gen Prius gets filled with gunk. What ya'll think?
Egr can be a dirty setup in any design. In the 60s they told owners use the best fuel available. After emissions regs in the 70s unleaded fuel caused the invention of egr or feeding the engine it's own waste in an attempt to make crap fuel burn properly. One way to fix dirty egr problems is designing it to feed the gases from the rear of the catalytic converter instead of in the exhaust side of the head or manifold. The catalyst acts as an egr filter before it gets fed back through the intake. This cleans everything up causing a lot less gunk to build up throughout the egr system and intake.
If direct injection, should be reduce the problem
@@chongweilee5903 Probably makes it worse actually, the gasoline actually helps keep the intake clean by acting as a solvent. It's oil vapours from the cylinder wall that clog things up.
@@chongweilee5903 how direct injection have anything to do outside of the combustion chamber ? DI have made it way worst ! why do DM car manufacturers does return to the port injection ?? cleaning the valve, maintaining the sealing in a longer span of time etc...
@@BigUriel actually PCR and EGR, but..
that's how the GS F gets 8l/100km. mind-blowing use of technology.
what surprises me is that the fuel air mixture stored in the intake manifold isn't strong enough to clean the valves in case of direct injection (only) engines... thus making the d4s necessary...
With DI engines the fuel isn't sprayed until ignition, no fuel ends up in the intake manifold.
but luckily the D4S is super refined at this point. i’ve got a 16 y/o 2gr fse and it’s still ticking away nicely
Thank you Toyota. My Rav 4 AWD hybrid is delivering 41 mpg in the city and on the interstate even at speeds of 80 mph.
And that is GOOD? ???????
@@benjaminsmith-haddon7316 for a brick shaped car that’s not a hybrid? Yes. I was on this comment to say my 20 corolla get’s like 50 highway but combined it’s getting like 39.
@@benjaminsmith-haddon7316 Find me another AWD mid 4,000 lb SUV that will get 41 mpg on the interstate and up to 44 mpg around town.
Those are industry best numbers for an AWD mid size SUV
Russ
@@benjaminsmith-haddon7316 Is it possible to be this stupid?
Now I am led to believe that an Atkinson cycle is a six stroke engine cycle...... OMG...
I don't know who is in your graphics department but they just illustrated a 6 stroke engine. 🤦
Man, how could they even make that mistake smh
Intake, compression, more compression, exhaust, lmao
Toyota's ahead of the game with a new gas-steam engine
right?! I was looking at the exhaust valve like... are you not going to explain why that's CLOSED on your exhaust stroke or? Cuz that looks like a pretty *interesting* feature of your 'atkinson cycle'..
I am glad I wasn't the only one who saw that. I was extremely confused. I had to watch it 3 times, because I thought something was off, but my brain didn't catch it right off. I thought VW was the only one playing with the 6 stroke (water injection) cycle, and I thought they wrote it off as a complete waste.
That exhaust valve at 2:06 is not working on time, haha
Aaaha inhale, explode, compress explosion even more, then open the valve on the way down. "The piston also encounters less resistance"
I laughed soo much
@@Dbass91 You lost me at inhale
@@Dbass91 That was funny the way you worded it
Extreme EGR rate!
So that’s why I lost a race to a 1.6L
it had that 20 valve advantage
😂
Toyota's Engineering Dept knows what they're doing; it's a pity Toyota's Marketing Dept doesn't.
R E V E R S E V T E C
lol
Reverse VTEC just kicked in yo
1:32 - 1:40 Shouldn't the exhaust valve open at the upstroke? By opening the exhaust valves on the following downstroke, air would be pulled in through the exhaust manifold.
What should have been: suck, squeeze, bang, blow, is here : suck, squeeze, bang, squeeze, (whatever happens on this downstroke), blow.
This animation is seriously f***ed up, unless Toyota invented a 6-stroke engine...
This looks more like a Miller cycle - but without supercharger.
Basically an turbo otto uses the leftover pressure to push the turbine, an Atkinson engine avoids that leftover pressure and thus avoids waste energy.
I drive a 2018 Tacoma 3.5 and I can tell on the highway I loose power . So like it’s a flat road at 70 mph and I have the gas pedal at a certain point then if I need to speed up just a little I only have to push the pedal a tiny bit. It doesn’t down shift to 5 gear it just feels like it’s got power. Then all of the sudden with out any reason as to why it changes it . It looses power like not a lot but it would be like a strong head wind is blowing or you have a small trailer behind you . The truck feels sluggish you have to push it harder just to maintain speeds constantly downshifting to 5th from only the slightest of inclines . I swear it’s more efficient in the normal Otto cycle than the other. Maybe there’s something to it. I average 2000 miles a month getting 22 mpg with a 2wd trd crew cab. Once I hit 100k I might be looking at a different brand .
The nonlinear throttle control and transmission programming have a lot to do with it. I have a manual transmission Tacoma which makes it easier to understand the engine's response in isolation. The 2GR-FKS can deliver plenty of torque at 1800-2200 rpm, but it takes a while (a couple seconds) to build power, presumably because it has to switch from Atkinson to Otto mode which does take time. The additional intake noise (sounds throaty) at low to moderate load is how you know it's in Atkinson mode because the throttle is left open to reduce losses while "throttle" control is performed by varying the intake duration. To get to Otto mode, the ECU must close the throttle and shift the valve timing while keeping the mixture on-target between the port and direct fuel injection systems. There's a lot going on in this engine, and I imagine that getting the transition from low to high torque at low RPM is very challenging to manage quickly and/or seamlessly. When you consider that they're basically accomplishing a form of variable displacement without cylinder deactivation and without brute-force turbocharging, it's amazing it works as well as it does. I can drive my commute without exiting Atkinson mode and consistently get above the sticker MPG. Do I wish the throttle response were quicker? Absolutely.
There are tunes available for the 3.5 that the TacomaWorld folks swear by to improve the low-end response of the engine.
Vomiting backwards through the intake of the fuel air mixture still seemed screwed up to me.
The animation didn’t help me understand the difference as much as I hoped it would. It seems that the Atkinson cycle wastes fuel when it allows the fuel air mix to pump backwards into the intake.
They might call this an Atkinson cycle engine but a true Atkinson cycle motor uses a linked crankshaft to mechanically shorten every other piston stroke. This means it only breathes 1 way through the intake valve and does not waste rotational momentum.
This style [As described by Toyota] results in a very contaminated intake path with combustion remnants, oil from cylinder walls and excess heat in the intake path.
This will cause problems with carbon fallout in the intake path, contaminating inlet ports and valves, also EGR and PCV contamination. Throttle bodies and sensors linked to the intake system can also suffer from contamination. Because of the heat any remaining fuel tends to remain in a form where it will be able to return to the cylinders but the oil and carbon fall out and turn into a hard tar like substance.
The Atkinson cycle engine is a specific patented engine design with a mechanically different compression and power strokes. The Atkinson cycle is just a thermodynamic principle that can be implemented by numerous different engine designs. The thermal cycle only pertains to what is happening to the gases inside the engine, not how the mechanical components are designed to achieve that. Same way there was an original "Otto engine" that doesn't look anything like our modern "Otto cycle" gasoline engines.
Most manufacturers with continuously variably valve lift technology implement the Atkinson cycle to some extent (like for example limiting the intake valve opening time which achieves the same as keeping it open during part of the compression stroke).
This just sounds fancy for VV-T/L/D and lean fuel mixture
I love atkinson cycle engine. It reduce gas usage.
I once rented 2001 Corolla and it was quick off the line but god forbid you ever want accelerate while part way up a hill. My usual car was a Chrysler with a 3 liter V6 and was fun to drive too. I am just glad the Corolla was not mine and I would be rid of it soon enough. Even the 2002 Neon I bought after the Chrysler felt quicker. It had a 2 liter 132 HP 4 cylinder that is somewhat similar to the 1.8 in that Corolla. The difference was that the Neon was more willing to accelerate on a highway road with a noticeable grade (while already moving), the Corolla would have none of it! It would be a true surprise to me to drive a 4 cylinder Toyota these days and see if they got any better (other than having CVTs). Sure Japanese cars are reliable but with some of them being ugly and boring it doesn't help their case when it comes to making me want one. For one it has to be able to get out of its own way, that Corolla couldn't do it to save the world!
Dude, that’s the car I’ve been driving for years and it’s ridiculously slow.
@@Jasiel.95 I know Corollas are slow. They might beat you at first but then on a hill everyone will beat them!
For lack of acceleration the winner was a 1200 cc side-valve 1949 Triumph Mayflower, even on the flat you could nor feel it. Every up slope required down shifting, sometimes ordinary roads were too steep. British cars were not all that bad but it was a harbinger for today. They did look good and were as solid as a brick outhouse.
This is a new type of V-tec from Toyota
Zit inderdaad een fout in het filmpje, dacht dat ik naar een nieuw type motor zat te kijken :-)
The next stage of hybrid is complete control of valving timing, generating, motoring consistent with optimum engine efficiency and road condition by fast acting chips. Such control would reduce many mechanical parts.
why would the exhaust valve open at 1:38
Who else is here after Tyler Hoover put Nitrous in his Prius?
still very educational
How about simply use lower compression?
That reduces power but doesn't have any other benefit
I think you might be on to something here. I'd bet compression is a lot lower on Atkinson than on Otto.
Can I just press accelerator pedal not so hard?
No, because the pumping losses still apply, and shortening the compression stroke reduces the work needed for compression of the gases
Same compression as Otto engines, but with longer strokes like Diesel engines. I actually like this concept. I drive a lot and I spend a lot on fuel. This wouldn’t provide life changing savings, but it’s a step forward.
It's not a longer stroke, it's a reduced volume of air being compressed, because the air isn't compressed as soon their is less parasotic resistance in the engine. You're also burning less air and fuel but in the same confined space. The part I don't get is reduced compression reduces efficiency which is why this engine doesn't get the MPG gains it should to make the Atkinson worth it. That reduced compression is why it has no power. If they increased the static CR before introducing the cycle I wonder if I would be possible to even that out, but then there are changes to everythings physics when one feature changes so idk
@@spencerkleiman5035 o
@@spencerkleiman5035well the mpg is better so obviously it’s better for traffic jams and cruising
Why is the background music so loud...??
Honda already used this kind of cycle shifting in R series engine since 2006
My 2019 Tacoma TRD off road has the 3.5 liter Atkinson engine and barely gets 19-20 mph if I drive it easy. Not sure how it's helping me.
Uhg - what a horrid corporate effort. This could have been so much better.
Ok this answers a lot
So it’s basically vtec?
So if using direct injection is this still needed ? Because DI motors can have higher compression or longer strokes with no chance of pre-ignition, the intake stroke brings in nothing but air. I was looking at the kia niro, it gets better gas mileage then the prius and other Atkinson cycle toyotas, but it uses a non atkinson motor, just a plain 4 cylinder, 13:1 compression with direct injection.
How does it make the expansion stroke larger and why does the exhaust valve open at 2:06
it makes the compression time shorter, so the useful compression stroke is not the full value. This makes the expansion stroke still being 100% of the basic design longer than the now shortened effective compression stroke. Expansion stroke is unchanged. Compression stroke active length has been reduced.
I love the Mr. Bean's engine
so intake valve timing and duration is the difference between Otto and atkinson?
so the atkinson push out the air+fuel mixture, burn less energy, but how about the amount of fuel got push out? wasted?
Those air and fuel mixture will going into another cylinder instead. They're savinv fuel by using the mixture from the other cylinder for the next and keep go on. Nobair amd fuel going to waste since it going to the intake manifold which eventually will ending up inbthe combustion chamber
Could someone help me understand this? What's the point if some fuel gets pushed back into the intake? Now you're wasting fuel and the computer has no way of accurately measuring the fuel:air ratio for the next combustion cycle. I genuinely don't understand how this is MORE efficient
I still can't get it. Where's the weird mechanism? I mean the one that makes the piston run two different lenghts.
So this is why my tacoma is so underpowered
Yeah it is underpowered. I made the mistake of trading my 16 Frontier for a 19 Tacoma because I was brainwashed about reliability. The 16 Frontier never gave me problems and it had way more power too and was immensely fun to drive. Now I drive this Tacoma and wonder if the thing can make it up the next hill.
Atkinson cycle turns off at full throttle. Toyota just makes slow (but still good) trucks lmao
I think certain people should work in this field before you start sizing up Reliablilty . I have a '23 Tacoma and that thing Runs perfectly fine for my taste and can take a hill with 0 problems. The 04 Tacoma I had was very underpowered, but that Engine will run for a lifetime! I don't understand what some of you people want or expect. Toyota buyers know what they want and what to expect. Sometimes I just don't get it. Did you not test drive the truck before hand? Geez
Awesome!!!!!!!!!!!!!!!! 🤩🤩🤩🤩🤩🤩🤩🤩🤩
Long story short- Otto cycle with an intake valve lag during the intake stroke. Into the compression stroke.
My 2006 Ford Escape hybrid uses an Atkinson 4 cylinder engine
1.6 4 cilindir walvematic+lpg😍
This is how to make a simple variable compression engine .
I live somewhere called Atkinson, does this mean k get a free Atkinson cycle powered vehicle?
Is this normally aspirated.?
Sooooo on hybrids they are just expelling some of the air and fuel the engine putted in before, wouldn't that be just downsizing but with more steps? And doing it less efficiently
cats lol
0:34 What? Two compression strokes and two intake strokes? Without exhaust!!!?
A motor that gets double the fuel economy but half the power isn't more efficient.
Except it doesn't make half the power. Watch the video, and you will learn that the Atkinson cycle is disabled under high load.
Also, I think you don't know what the word "efficient" means.
@@specialopsdave Except it won't double the fuel economy either. In real life Toyota engines are not more fuel efficient than their competitors. That's why this modification is not widely used in other vehicles.
Why do you equate efficiency and economy?
@@specialopsdave especially of a system or machine) achieving maximum productivity with minimum wasted effort or expense is the definition of efficiency
So yeah an engine that puts out less power but uses more fuel is not efficient
An engine that’s used less gas and makes more power is efficient
Your backwards bro
@@aircraftnut15 So you're saying that the atkinson cycle increases fuel consumption? No, it doesn't. It reduces fuel consumption by 30% while reducing power output by 25%, meaning if you *increase throttle* so the engine outputs *the same power,* it will consume approximately 5% *less fuel for the EXACT SAME HORSEPOWER.* It's only when you near 100% throttle that the lower power output would become noticible, but by that point, Atkinson cycle has already turned itself off, and the engine is running a conventional engine cycle.
why don't you use a super charger in non hybrid vehicles?
Then ita not going to name Toyota anymore. Since boosted cars will not be as reliable as a natural aspire.
Rica etsem altyazılardaki otomatik çeviri seçenekleri arasına ‘Türkçe’ dil seçeneğini de ekleyebilir misiniz? Sizi anlamak ve takip etmek istiyorum !!!
for 2020 tacoma sr5 3.5L V6 engines, is this combination of Atkinson and Otto going on? thanks for your response.
Yes, the engines run on the atkinson cycle when demand for power is low. Once demand for power is needed (you floor it) the see engine runs on the otto cycle.
"might not be applicable to your toyota model"
Me with my Mazda Mx-5: Oh, okay.
Nice way of explanation of atkinson cycle.
I am genuinely bamboozeled
Is it running just rich?
Still an Otto though and having all that complexity to overcome its shortcomings is added dead weight and more items to manufacture and service=costs.
"Lower powet output"
Since when did all vehicles need at least 200 hp. A prius would do fine with 100 hp and get 50 mpg doing it
I remember when mom got a little toyota paseo. It advertised 100 hp and it was very small. That would have been 1990(ish). I bet the mpg was pretty good on that thing. I had just started driving and I beat the hell out of it lol
I am 64 my first car was a Nash metropolitan,55 hp 4 cylinder,that car is worth thousands now.lol
They got vvt solenoids, nothing new
Does this apply to my '80 Land Cruiser? Thanks in advance.
No
In my owner' s manual it says that my toyota has came with a rotary engine but I haven' t found anything regarding to cycles. Can someone help me?
Rotary engine in automobiles refers to the Wankel engine which, to my knowledge, Toyota has never produced. I had a rotary-engined Mazda long ago and it was junk. Worst car I have ever owned.
@@Hopeless_and_Forlorn it was sarcasm hahaha
this is not a new cycle. its called bad valve timing
Atkinson, sound funny to me. Is that the actor who play as a English man?
With Toyota's infinite wisdom,,,,
Toyota engineers, can you make a pickup frame not rust out so fast and the truck snap in two ? ? ?
Can you also make the bodies not rust so fast ? ? ?
my brothers bed fell off within a year brand new... not from rust but he lives where there are only dirt roads and just couldn't handle the continuous shaking.
Trucks are used in adverse conditions and when you scratch the paint down to the metal the steel will rust on any vehicle. To the design challenge, why don't they just offer an option for stainless steel or aluminum body panels for and extra 2 grand? For people in the rust belt it would be well worth it and the resale value would be head and shoulders above anyone else. The only reason I got rid of my last car was due to rust or I would be driving it 15 years or more. IMO I think they keep fooling themselves into thinking this years "new coating" will keep it rust free for way longer than it actually will. Kind of the same way roof shingles keep changing formulations and say "30-year shingles" and now fiberglass shingles but it is all the same tar crap that lasts half that at best and the consumer has to buy and replace again and again.
Use Fluid Film and you won't have rust issues.
Is there any additional maintenance involved for the backflow of air/fuel into the intake manifold? Intake system cleaning? Etc?
well the fuel is what kept the carbon off the valve seats as it washed away in port injected engines
These Engines have Both Direct Injection and Port injection to help with these problems.They switch on and off through different modes depending on driving habits.From a mechanics standpoint point I have seen that this design does its job and works very well. If you are familiar with how Toyota Engineers things, they have pretty much worked out the bugs with this design. Keep in mind that Toyota Pioneers a lot of mechaical designs and sells those ideas to other manufacturers . Toyota also doesn't give up on their innovations either. They keep churning them out while perfecting them in the process.
Next: Open exhaust valve on work stroke.
Hmmm Toyoda Canada. Interesting Eh?
Adopt this method while drinking and your beverage will last longer. When you tilt the cup/can/glass back, spit some back out after every drink.
So that's why priuses are so fcking slow, they "backwash" the stuff needed to make power out of the cylinder
I still don't understand why this called atkinson rather than miller outside of the lack of forced induction
why not use the miller cycle?
Someone told me that the Miller cycle is better for supercharge engine
It's basically the same but Miller uses a compressed charge (normally a supercharger) to compensate for the loss of low rev torque.
Like VVTi but the wrong way around.
Isn't this miller?
Can Atkinson Cycle engine be remapped to gain more HP? e.g. Accord Hybrid
You'd have to modify the cams to do this.
If you wanted a fast car, why did you get a honda accord hybrid😂
The atkinson cycle turns off at high throttle anyways so why do you care
Pretty much without exception, internal combustion engines expend 80% of the energy put in, as heat thrown out. A really efficient boiler for a home, manages 93%. Therefore, every gasoline engine is a modestly good boiler. But, a terrible way to turn a shaft, only expending 20% of what went in, to do so. Now, throw all that manufacturers and big oil companies have told you, to one side, and ask this question of anything they build, design, or ‘crack’ to do with internal combustion engines: Does this enable an internal combustion engine, to beat 20% efficiency? This is all that matters.
Novel designs like rotary engines, boxers, v-engines, etc etc, nothing has ever beaten this measure of energy in/energy out (at a shaft). I have literally bought a hybrid over an EV, because in our northern climate, it’s a great way to keep warm, it’s *that* inefficient…yet, this is efficient for my needs, 3/4 of the year. I used to get excited when people said a special new design or implementation of an ICE had been produced, now I feel a little resigned. But, there’s great news, I can literally tell you how to save gasoline engines, and yet nobody will rush to do it: harness a lot of that lost energy/heat, by a micro-steam-turbine system, use it to charge a hybrid battery. This, would work. It is the only way that ICE could legitimately remain even while we treat the ecology and pollution as priorities. But don’t hold your breath, despite the fact huge steam turbines are the workhorse of nuclear power plants generating electricity at massive scale, micro systems have very little research. Why not? Your guess is as good as mine. Take care and be at peace.
Yeah and the Tacoma still only gets 16mpg on a good day down hill with a tail wind! I will stick to my 98 with the 3RZ-FE.
Not true. I get 22 mpg on the interstate with heavier AT's running 80 mph in my 2021. I get 16 to 18 in town, stop and go driving, and I drive pretty aggressively. Power is there when I need it, it just likes RPM's unlike my 5.7 Silverado.
I get 21 mpg in mixed suburban driving with the manual. The only time it goes down to 16 is if I'm towing.
Why on earth is the exhaust valve only opening as the piston travels down, making it look like a 6 stroke 😂😂 Dayum Toyota
This isn’t an Atkinson cycle, it’s VVT. The Atkinson cycle as proposed by James Atkinson literally hinges on a piston connected to a a crankshaft via a double pivot linkage. An Atkinson completes the Otto’s 4 stroke cycle in one cycle or Revolution off the crankshaft. Toyota stop lying.
The accent Is funny😂😂😂
the non existent accent
@@zacharyreynolds4303 where
So why not using smaller otto engine!? I can’t understand the benefit of that Atkinson 🤷♂️, it is 2.0 engine using fuel like in 1.8 or smaller but the power is less than 2.0 and 1.8 😵💫😵💫😵💫.
How is it atkinson, isn't valve timing miller? The other one has more to do with multiple rods
dumb, yea! less power! so you have the piston pushing air and fuel back into the intake. all these years I've heard about these engines, I thought it was some super tech going on, just more things to go wrong as they age. guess that's why the Mazda Millenia never took off
Less power unless you apply throttle requesting more power, when it switches to otto cycle
And if you think intake manifolds can't handle fuel, you clearly don't understand engines or their history. By "something to go wrong", you mean the VVT used to do this which is otherwise present in almost every modern vehicle ever
@@specialopsdave Exactly. Mazda, VW Group and Ford (and I bet a load of others) use the same VVT Atkinson to Otto switching now. It really works.
Nice...but the video doesn't explain nice the difference between the cycles. Just goes too fast as it was so simple, and the images also doesn't help.
TOYOTA MARK 2 JZX81 🔝🔝 🇷🇺
This still doesn't explain why they used a 1.8l engine in the Prius. An why they are so scared to put a turbo for more fuel efficient
So that it's more efficient at higher speeds
Turbos are economical as low speeds but inefficient as high speeds
It sounds like a lot of extra complexity in the name of dubious gains. How much fuel does this really save while it's spitting cylinder gunk back into the intake and a bunch of intake sensors? Any engineer will tell you that complexity is the enemy of reliability.
I would take this over a 1.3 liter turbo (or whatever tiny displacement they're down to these days).
@@confidentlocal8600 I'd take neither. Those manic little turbocharged litre engines are highly stressed, not a recipe for reliability. My answer to all that is something along the lines of the 1UZ.
Turbos are not very reliable, as we Know , that is what Toyota is known for....Reliablilty. Besides, this Engine has Port Injection and Direct Injection so remedy these carboning issues. These Engine Managment is wiser than u might think. Toyota really thought these through. Coming from a 20+ years as a Mechanic, I will tell you that I will take a Toyota any day over the Domestic garbage that is produced. Reliablilty is what these designs are all about.
So it's a reverse turbo
So basically I can throw a Yaris camshaft in my Prius and I’ll be making a lil more power 🤔
I like gs450h 😅
Annoying Loud music …why ? Otherwise interesting
TLDR: It delays closing the inlet valve to allow relatively more expansion on the combustion stroke.
I dont see the point of having the atkinson cycle engine in hybrid vehicle that cannot switch to otto cycle, you could instead have a engine with low CC, which in same way gives low power and high fuel efficiency
Atkinson = Miller?