The Miller Cycle

[mts]

 

- Intake stroke: - The inhalation valve opens, high sucking the mixture which was compressed into the cylinder.

- It is slow closing the inhalation valve: Mirror cycle engine individual distance. Delays the timing which the inhalation valve closes, portion of inhalation is reset.

- Compression stroke: The piston from bottom dead center approximately 1/5 the inhalation valve you close at the point in time when it rose, substantial compression stroke starts.

- Expansion stroke: Ignition -> the expansion energy due to combustion pushes down the piston to bottom dead center

- It is found that it is longer than compression stroke.

- Exhaust stroke: It is the distance which discharges the gas which consumes energy in full outside the cylinder.

 

 

 

Larger version of pic....[attachmentid=58]

[Synesthesia]

it brings a tiny tear to my eye everytime just at the mention of the name

[mts]

Almost like the sweet whine of the engine when kicked down to pass on the highway

[///BHRpowered]

mmmm, I know the sound well

[mts]

It is sweet!

[clasiqued]

 

- Intake stroke: - The inhalation valve opens, high sucking the mixture which was compressed into the cylinder.

 

 

Very nice.

 

BTW. There is ANOTHER mass-produced (well, sorta) mainstream car that ALSO uses the Miller Cycle. It was just released, although its naturally aspirited.

 

Do you know what it is?

 

I know BHR/Synth don't care.

 

So maybe one of the other 6 members does?

[mts]

Clasiqued... I am not sure so I will not guess.... but tell me if I am on track here.

 

 

 

 

Hybrid Automotive Engine Using Ethanol-Burning Miller Cycle

 

This engine would operate with high fuel efficiency and generate little pollution.

 

Langley Research Center, Hampton, Virginia

 

 

A proposed hybrid (internal-combustion/electric) automotive engine system would include as its internal-combustion subsystem, a modified Miller-cycle engine with regenerative air preheating and with autoignition like that of a Diesel engine. The fuel would be ethanol and would be burned lean to ensure complete combustion. Although the proposed engine would have a relatively low power-to-weight ratio compared to most present engines, this would not be the problem encountered if this engine were used in a non-hybrid system since hybrid systems require significantly lower power and thus smaller engines than purely internal-combustion-engine-driven vehicles. The disadvantage would be offset by the advantages of high fuel efficiency, low emission of nitrogen oxides and particulate pollutants, and the fact that ethanol is a renewable fuel.

 

The original Miller-cycle engine, named after its inventor, was patented in the 1940s and is the basis of engines used in some modern automobiles, but is not widely known. In somewhat oversimplified terms, the main difference between a Miller-cycle engine and a common (Otto-cycle) automobile engine is that the Miller-cycle engine has a longer expansion stroke while retaining the shorter compression stroke. This is accomplished by leaving the intake valve open for part of the compression stroke, whereas in the Otto-cycle engine, the intake valve is kept closed during the entire compression stroke. This greater expansion ratio makes it possible to extract more energy from the combustion process without expending more energy for compression. The net result is greater efficiency.

 

In the proposed engine, the regenerative preheating would be effected by running the intake air through a heat exchanger connected to the engine block. The regenerative preheating would offer two advantages: It would ensure reliable autoignition during operation at low ambient temperature and would help to cool the engine, thereby reducing the remainder of the power needed for cooling and thereby further contributing to efficiency. An electrical-resistance air preheater might be needed to ensure autoignition at startup and during a short warmup period. Because of the autoignition, the engine could operate without either spark plugs or glow plugs.

 

Ethanol burns relatively cleanly and has been used as a motor fuel since the invention of internal-combustion engines. However, the energy content of ethanol per unit weight of ethanol is less than that of Diesel fuel or gasoline, and ethanol has a higher heat of vaporization. Because the Miller cycle offers an efficiency close to that of the Diesel cycle, burning ethanol in a Miller-cycle engine gives about as much usable output energy per unit volume of fuel as does burning gasoline in a conventional gasoline automotive engine.

 

Because of the combination of preheating, running lean, and the use of ethyl *This reference banned by MW*, the proposed engine would generate less power per unit volume than does a conventional automotive gasoline engine. Consequently, for a given power level, the main body of the proposed engine would be bulkier.

 

However, because little or no exhaust cleanup would be needed, the increase in bulk of the engine could be partially offset by the decrease in bulk of the exhaust system. The regenerative preheating also greatly reduces the external engine cooling requirement, and would translate to reduced engine bulk. It may even be possible to accomplish the remaining cooling of the engine by use of air only, eliminating the bulk and power consumption of a water cooling system.

 

The combination of a Miller-cycle engine with regenerative air preheating, ethyl *This reference banned by MW* fuel, and hybrid operation could result in an automotive engine system that satisfies the need for a low pollution, high efficiency, and simple engine with a totally renewable fuel.

 

This work was done by Leonard Weinstein of Langley Research Center. For further information, access the Technical Support Package (TSP) free on-line at www.techbriefs.com/tsp under the Machinery/Automation category.

 

[mts]

This type of engine was first used in ships and stationary power-generating plants, but was adapted by Mazda for their KJ-ZEM V6, used in the Millenia sedan. More recently, Subaru has combined a Miller cycle flat-4 with a hybrid driveline for their "Turbo Parallel Hybrid" car, known as the Subaru B5-TPH.

 

 

 

Increase your knowledge HERE

 

 

 

Another good technical REPORT

[mts]

The standard four-stroke engines described in How Car Engines Work are called Otto-cycle engines. They are named after Nikolaus Otto, who invented this type of engine in 1867. In the same way, Diesel-cycle engines are named after inventor Rudolf Diesel.

 

Ralph Miller patented his Miller-cycle engine in the 1940s, and for the last several years Mazda has been using this type of engine in some of its cars.

 

A Miller-cycle engine is very similar to an Otto-cycle engine. The Miller-cycle uses pistons, valves, a spark plug, etc., just like an Otto-cycle engine does. There are two big differences:

• A Miller-cycle engine depends on a supercharger.
• 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.

Here are some interesting links:

• How Car Engines Work
• How Stirling Engines Work
• How Quasiturbine Engines Work
• How Rotary Engines Work
• How Turbochargers Work
• What is the difference between a turbocharger and a supercharger on a car's engine?
• Mazda: Miller Cycle Engine

[clasiqued]

Bloody hell that's comprehensive.

 

But. No.

 

Commerically released (you can buy it now, I know I test drove one 2 days ago) mainstream car, was the clue:

 

Here it is:

 

http://www.italiaspeed.com/new_models/2005...ra/engines.html

 

Damn. It was a fun drive.

 

And again:

http://www.alfaromeo.com.au/media/minisites/brera_movie.mov

 

No flames please.

[mts]

Nothing to flame... it is an Alfa... say no more. There is a thread here about the 2010 Alfas due for North America

[mohamedeladawy@hotmail.com]

awesome