The common thread throughout Atkinson's designs is that
the engines have an expansion stroke that is longer than the compression stroke
, and by this method the engine achieves greater thermal efficiency than a traditional piston engine.
What is the difference between Atkinson and Miller cycle engines?
An Atkinson-cycle engine differs from a Miller-cycle engine in that
the Miller-cycle engine uses some device to push air into the system – a supercharger or turbocharger – while the Atkinson-cycle engine is naturally aspirated
.
What is the different between Atkinson cycle and Otto cycle?
An Atkinson cycle has a greater work output and a higher thermal efficiency than the Otto cycle at the same operating condition
. The compression ratios that maximize the work of the Otto cycle are always found to be higher than those for the Atkinson cycle at the same operating conditions.
Is an Atkinson cycle more efficient?
The Atkinson cycle is more efficient
because it has a large expansion ratio than compression ratio. It delays the closing of the suction valve until the piston completes 20% to 30% of the upstroke during the compression stroke.
Why do Hybrids cars use Atkinson cycle engines?
An Atkinson cycle engine makes less power than the otherwise equivalent Otto cycle unit, which is why the design is more popular with hybrid models, which
aim for fuel economy over acceleration and have electric motors that can compensate for the difference
.
Can you turbo an Atkinson cycle engine?
Like said above, the Atkinson is designed to have a short compression stroke and a longer combustion stroke (by valve timing).
A turbo would actually cancel out this design
, meaning it would be putting more compression on the compression stroke.
Who makes Atkinson engines?
Toyota has announced the development of two hyper-fuel-efficient small-displacement petrol Atkinson cycle engines: a three-cylinder 1.0-liter and four-cylinder 1.3-liter which will be introduced across the range from next year in 14 different variations.
What is a Ford Atkinson cycle engine?
What Is A Ford Atkinson Engine?
A type of internal combustion engine
, James Atkinson devised the Atkinson-cycle engine in 1882. There is a low barrier to entry into the Atkinson cycle in order to provide efficiency and low electricity density. It is also used in some modern engine versions to make this variation.
Who uses Atkinson engines?
Chevrolet Volt
. Chrysler Pacifica (front-wheel drive) plug-in hybrid model minivan. Ford C-Max (front-wheel drive / US market) hybrid and plug-in hybrid models. Ford Escape/Mercury Mariner/Mazda Tribute electric (front- and four-wheel drive) with a compression ratio of 12.4:1.
What is Toyota Atkinson-cycle?
Atkinson cycle engines are
12 to 14 percent more efficient than a standard gas engine
, leading to what are expected to be class-leading fuel economy ratings. A new Atkinson cycle engine will provide better efficiency numbers without the use of turbocharges or diesel power as well.
What is an Atkinson-cycle petrol engine?
An Atkinson-cycle engine works the same way, but with a twist. In a regular engine, the intake valve stays closed when the piston moves up on its compression stroke, creating pressure in the cylinder. In an Atkinson-cycle engine,
the valve stays open slightly longer
.
How does the Miller cycle engine work?
A Miller-cycle engine
leaves the intake valve open during part of the compression stroke, so that the engine is compressing against the pressure of the supercharger rather than the pressure of the cylinder walls
. The effect is increased efficiency, at a level of about 15 percent.
