While a modified Otto-cycle piston engine using the Atkinson cycle
provides good fuel efficiency
, it is at the expense of a lower power-per-displacement as compared to a traditional four-stroke engine.
How much more efficient is an Atkinson engine?
The end result is a maximum thermal efficiency of
37 percent
and a fuel efficiency improvement of “approximately 30 percent over current vehicles” – that's the difference between 60 mpg (US) and 78 mpg (US) and it's an astonishing improvement.
Is the Atkinson cycle more efficient than the 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.
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 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.
What is the difference between Miller and Atkinson cycle?
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
.
Who makes Atkinson engines?
What's the Benefit?
Honda engineers
update an established engine design with leading-edge technology to create an extremely fuel-efficient powerplant.
What is the difference 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.
How does an Atkinson cycle engine save fuel?
In an Atkinson-cycle engine, the valve stays open slightly longer. Since there's now less pressure in the cylinder, the piston doesn't have to work as hard to overcome friction, which in turn improves fuel efficiency.
What is a Ford Atkinson 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.
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.
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.
Does the Camry Hybrid have an Atkinson engine?
The Prius and Camry hybrids work off a four-cylinder, high expansion ratio Atkinson cycle engine
. Atkinson cycle engines squeeze optimum energy from gasoline combustion by increasing the expansion ratio and by extracting every last bit of power from the gas-air mix.
How does Miller cycle reduce NOx?
One promising combustion strategy that can curb NOx emissions with a low fuel consumption penalty is to simultaneously reduce the in-cylinder gas temperature and pressure. This can be achieved with Miller cycle and by
lowering the in-cylinder oxygen concentration via exhaust gas recirculation (EGR)
.
Who uses Miller cycle engine?
This type of engine was first used in
ships and stationary power-generating plants
, but in the 1990s, it was adapted by Mazda for use in the Mazda Millennia. To be effective, the Miller cycle turbocharger or supercharger must be able to compress the air with less energy than with the engine's pistons.
What is a miller capable engine?
What Is A Miller Capable Engine?
A type of internal combustion engine uses the Miller cycle as a thermal system
. This kind of engine is typically two- or four-stroke, and operates on diesel fuel, tion may be two- or four-stroke and may be run on diesel fuel, gases, or dual fuel.
