Modern Atkinson Engine

thanks

 

Prius's engine is in fact Otto engine using Atkison cycle. Atkinson engine is quite different in design as Atkison was trying to completely circumvent Otto's patents during the time of his invention. Atkison engine achieves all 4 cycles inside one crankshaft revolution, Prius's engine does not - as it is still Otto engine.

So to be scientifically correct, we should talk about "Modern Atkinson cycle engine". Not "Modern Atkinson engine".

 

Otto engine using Atkinson cycle is also known as Miller cycle.

I am not able to see the animation. Bob, can you pick a different background color?

 

Only if it uses a supercharger. A Miller cycle engine is a modern Atkinson cycle with a supercharger.

Tom

 

Doesn't a Miller cycle engine need to have a supercharger?

 

You guys are right. Miller cycle uses mechanical supercharger. Prius has electrical supercharger.

 

*so confused*

 

+1

 

nice expl.

 

Atkinson cycle boost the efficiency to Diesel level but lowers the torque. Miller cycle engine makes this up with a supercharger. Electric motor in Prius negates the need for high torque ICE; one of the synergy effect.

 

Mazda offers non-supercharged Miller cycle engine.
MAZDA:Miller-cycle engine | Environmental Technology

Ken@Japan

 

Latest IE Windows and Google chrome both got green background and no animation.

 

In 1882, when the Atkinson cycle engine was patented to circumvent the Otto cycle engine patent, there was no equivalent to today's variable valve timing with intelligence, better known as VVT-I, so Atkinson provided his cycle by employing a very complicated system of mechanical devices, said cycle which was necessarily fixed, and had no intelligence.

Otto cycle engines are well-known, and have been widely employed for a century or more. High reliability and low cost are certainly several of its important advantages.

However, Atkinson's original ideation of his cycle was neither high in reliability nor was it low in cost.

Enter the VVT-I engine, which simulates an Atkinson or Atkinson-Miller cycle by employing simple, highly reliable additions to an Otto cycle engine.

I agree that "modern Atkinson cycle engine" is more correct than "modern Atkinson engine".

Just as correct would be "Otto cycle engine with additions for Atkinson or Atkinson-Miller cycle function and performance, hereinafter termed 'modern Atkinson cycle engine' for short".

 

well i hope otto, miller and atkinson are getting the royalties.

 

Rudolph Diesel isn't getting any royalies for his inventive device.

Besides, it took the likes of Kettering and his many associates to make Diesel engines a practical every-day reality.

Think: Electro-Motive 567, 645 and 710 locomotive power plants, and Detroit Diesel 6-71 on-/off-road power plants, and its many derivatives.

The practical "unit injector" was brought to market by General Motors in 1938 with both the 567 and the 6-71, a great many years after Diesel's "pulverized coal" Diesel-cycle engine, which was a failure.

 

good point, i'm no expert in patents and licensing, that's for sure!

 

I DID enjoy that page, but I think the firing order may be incorrect.

The Prius 4-bangers use a 1-3-4-2 firing order, which is functionally a 2-1-3-4 firing order.

The intake ports are separated into two pairs: cyls 2 and 1, and cyls 3 and 4, this being "downwind" of the throttle plate.

During cyl 2's compression stroke, the intake valve remains open for a significant time thereby forcing cyl 2's "excess charge air" into cyl 1.

The same is true of cyl 3 into cyl 4.