Why is Atkinson cycle more efficient?
The Atkinson cycle delays the intake valve’s closing until the piston has completed 20 to 30 percent of its upward travel on the compression stroke. Atkinson wins on efficiency because its expansion ratio is significantly larger than its compression ratio.
What cars use Atkinson cycle?
Vehicles using Atkinson-cycle 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?
A great example is the new-for-2017 Toyota Prius Prime. But just what is the Atkinson cycle, and what does it mean if you buy a car with an Atkinson cycle engine? Simply put, it’s a valve timing adjustment to the standard Otto cycle, which all modern gasoline engines use, to make the engine a bit more efficient.
How does Atkinson cycle engine work?
The pistons are powered by gasoline, sprayed into the engine and detonated by the spark plug. The piston moves four times in each cycle: down to draw in gasoline vapour, up to compress it, down when the vapour ignites and explodes, and then up to push out the exhaust.
How long will a Toyota 3.5 engine last?
Chances are this engine will provide a mostly trouble free, reliable experience up to 200,000 miles. Some Toyota 3.5L V6 engines even make it well past that mark, so it definitely has solid longevity.
What are characteristics of the Atkinson cycle?
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 to find efficiency of cycle?
The formula for process cycle efficiency is value-added time divided by total lead time. For instance, if the total lead time for a process is 4 hours and the value-added time equals 1.2 hours, you get a process cycle efficiency of 30 percent – a figure generally viewed as very good.
How is the Atkinson cycle works?
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.
What is an Atkinson cycle?
In the late 20th century, the term “Atkinson cycle” began to be used to describe a modified Otto-cycle engine—in which the intake valve is held open longer than normal, allowing a reverse flow of intake air into the intake manifold.
What is an Atkinson cycle engine?
Atkinson cycle explained. The Atkinson-cycle engine is a type of internal combustion engine invented by James Atkinson in 1882. The Atkinson cycle is designed to provide efficiency at the expense of power density. A modern variation of this approach is used in some modern automobile engines.