Q. What is Miller cycle in diesel engine?
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. In diesels, Miller cycle has been used primarily to control NOx emissions at high engine load.
Q. Why is Miller cycle more efficient?
The Miller cycle has one additional benefit: When the intake air is compressed by a supercharger then cooled by an intercooler, it has a higher density and a lower temperature than that obtained by a piston compression alone, further increasing the engine’s efficiency.
Q. What cars use the Miller cycle engine?
The Miller-cycle system was most famously used in production by Mazda’s Millenia, with its KZ-JEM 2.3-liter V-6, which ceased production in 2004.
Q. 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 …
Q. What is the difference between Atkinson and Miller-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.
Q. 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.
Q. What kind of engine is the Miller cycle?
Miller cycle. This type of engine was first used in ships and stationary power-generating plants, and is now used for some railway locomotives such as the GE PowerHaul. It was adapted by Mazda for their KJ-ZEM V6, used in the Millenia sedan, and in their Eunos 800 sedan (Australia) luxury cars.
Q. 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.
Q. When to close the valve on a Miller cycle engine?
The ideal supercharged Miller cycle with early and late intake valve closing. When a Miller cycle engine has delayed (late) intake valve closure, it reduces the load on the piston as it rises to begin the compression stroke.
Q. Why does the Miller cycle use a supercharger?
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. This occurs only at low pressures, so the Miller cycle uses the turbocharger or supercharger for the first part of the compression process and uses the piston for the remainder.
