Atkinson Cycle Engine

The Atkinson Cycle is a method of internal combustion first proposed by English engineer, James Atkinson, in 1882. The Atkinson Cycle uses a different thermodynamic process than the traditional Otto Cycle common to most gasoline engines.

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[selahaddina.u.b.]

If you've come this far while nerding on the automotive industry, you know that you cannot be amended.

[benedictroberts]

Translation: "The valve timing is fucky"

[Meeper]

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

[DSperformance]

So its basically an otto motor, with a long duration intake lobe

[MCist]

Is it 6 stroke cycle showed o this animation? Or it's something wrong with me? 😵

[rncondie]

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.

[tymchuk]

That exhaust valve at 2:06 is not working on time, haha

[gogutzy]

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...

[ronaldderooij]

Now I am led to believe that an Atkinson cycle is a six stroke engine OMG...

[IprogressiveI]

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?

[blairo]

I don't know who is in your graphics department but they just illustrated a 6 stroke engine. 🤦

[fd]

This looks more like a Miller cycle - but without supercharger.

[edrumsense]

Basically an turbo otto uses the leftover pressure to push the turbine, an Atkinson engine avoids that leftover pressure and thus avoids waste energy.

[michaelnewman]

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 .

[perbilse]

Toyota's Engineering Dept knows what they're doing; it's a pity Toyota's Marketing Dept doesn't.

[HepauDK]

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...

[dazaspc]

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.

[OldCanadianguy]

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.

[kickyadick]

One minute in, I learned effectively nothing about why Atkinson cycle saves fuel.

[BigLeagueDrew]

And now anyone who didn’t catch the mistake is probably very confused on how engine cycles work.