What is a miller capable engine?
In engineering, the Miller cycle is a thermodynamic cycle used in a type of internal combustion engine. The Miller cycle was patented by Ralph Miller, an American engineer, US patent 2817322 dated Dec 24, 1957. The engine may be two- or four-stroke and may be run on diesel fuel, gases, or dual fuel.
What is a Miller cycle explain what is different?
The Miller cycle is a modification of an over-expanded cycle which provides a higher expansion ratio than compression ratio, with the advantage of providing improved thermal efficiency compared to conventional internal combustion engine operating conditions (Branyon and Simpson, 2012).
What is the difference between Otto cycle and Miller cycle?
In the traditional Otto cycle, the intake valves close at the bottom dead center (BDC), while in the Miller cycle, the intake valves closing (IVC) is advanced to ahead of the BDC making the expansion ratio larger than the compression ratio (CR) which reduces the compression work due to the advancement of intake valve …
How does a 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.
Why is there a Miller-cycle?
In diesels, Miller cycle has been used primarily to control NOx emissions at high engine load. In spark-ignited engines, the benefits of the Miller cycle include reduced pumping losses at part load and improved efficiency, as well as knock mitigation.
What cycle is the gas engine?
four-stroke cycle
Most gasoline engines are of the reciprocating piston-and-cylinder type. The essential components of the piston-and-cylinder engine are shown in the figure. Almost all engines of this type follow either the four-stroke cycle or the two-stroke cycle. Typical piston-cylinder arrangement of a gasoline engine.
How does the Miller cycle engine work?
What is an Atkinson cycle petrol engine?
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 variation of this approach is used in some modern automobile engines.
How does an Atkinson 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 is Miller cycle realized in natural gas engine?
Miller cycle can be realized by variable valve actuation (VVA), which means that intake valve opening timing and intake valve opening duration can be controlled accurately. This paper adopts this way to realize Miller cycle for the turbocharged lean-burn natural gas engine.
Is the Miller cycle an over expanded cycle?
The Miller cycle is an over-expanded cycle implemented with either early (EIVC) or late (LIVC) intake valve closing. Miller cycle has been implemented in both diesel and spark-ignited engines.
When does the intake valve close in a Miller cycle engine?
2. A Miller cycle engine has either an early or late intake valve closing during the compression stroke. When the intake valve closes late, the piston travels 20 to 30% of the way back up to the top of the cylinder before the intake valve finally closes, so that the engine compression starts at the pressure of the turbocharger or supercharger.
Who is the inventor of the Miller cycle?
In engineering, the Miller cycle is a thermodynamic cycle used in a type of internal combustion engine. The Miller cycle was patented by Ralph Miller, an American engineer, US patent 2817322 dated Dec 24, 1957. The engine may be two-or four-stroke and may be run on diesel fuel, gases, or dual fuel.