Ciclo Atkinson

Páginas: 10 (2407 palabras) Publicado: 14 de septiembre de 2011
Index of CONTENt

1. iNTRODUCTION………………………………………………………………….1
2. hISTORY…………………………………………………………………………...1
3. dESIGN……………………………………………………………………………..2
3.1.- Four-stroke motor-cycle Atkinson………………………….2
3.1.1.- Intake stroke…………………………………………………………3
3.1.2.- Compression Stroke………………………………………………..3
3.1.3.- Power Stroke………………………………………………………….3
3.1.4.- Exhaust Stroke……………………………………………………….34. Atkinson Rotary Motor-cycle……………………………………….4
5. Atkinson’s Cycle P-V Diagram…………………………………………4
6. Mathematical Demonstration of Efficiency…………………5
7. Applications…………………………………………………………………..6
7.1.- Application in Electric Hybrid Cars………………………...6
7.2.-Atkinson-Cycle Rotary Engine: Libralato Ruggero…7
8. aTKINSON pROBLEM…………………………………………………………..7
8.1.- atkinson problemsolution……………………………………...8
9. BIBLIOGRAPHY…………………………………………………………………10

iNDEX OF FIGURES

1. Atkinson Engine…………………………………………………………………..2
2. fOUR STROKES IN ATKINSON´S CYCLE………………………………………..3
3. Atkinson Cycle P-V Diagram………………………………………………...4

iNDEX OF FIGURES

1. Table 1. Atkinson Cycle ProbleM…………………………………………...7
2. Table 2. Atkindon Problem Solution……………………………………...91. Introduction:
The Atkinson cycle engine is a type of internal combustion engine invented by James Atkinson in 1882 in order to provide efficiency at the expense of power density. Nowadays it is used in some modern hybrid electric applications, and it is considered to have a greater thermal efficiency than the Otto cycle.
The Atkinson Cycle is one in which the stroke of the piston can vary inlength across the four cycles in a four-stroke internal combustion engine. Typically, the length of the stroke during the power cycle is increased to promote efficiency; however, because this can come at the expense of a shorter intake stroke, there is some loss of power. For this reason, this type of engine design is best suited for use in a hybrid system where the electric motor can compensatefor these power losses.

2. History:
The internal combustion engine was first realized in its modern form by Nikolaus Otto in 1867. The technology spread quickly, and by World War I, the internal combustion engine was everywhere in both mobile and stationary applications.

Later in 1882, a British engineer of Hampstead called James Atkinson (1846–1914) invented the Atkinson cycle engine.
Byusing variable engine strokes from a complex crankshaft, Atkinson was able to increase the efficiency of his engine, at the cost of some power, over traditional Otto-cycle engines. A few years later, he was awarded the John Scott Medal of The Franklin Institute in 1889.
Around the world, fortunes were made and lost by those who made automobiles, fuels, tires, and all the other things necessary forpeoples’ new found mobility. Meanwhile, the internal combustion engine had found applications in airplanes and seagoing vessels. In manufacturing and power generation, these sources of mechanical energy were also common.
Today, internal combustion engines are everywhere, and there are growing social concerns surrounding their emissions, the procurement of their fuels, and their production. Somesuggest that their utility for many applications will end. However, it is clear that, for the moment, there are many applications where no other technology will be practical for some time. Therefore, research into improving the internal combustion engine is still of great social and economic importance.
Nowadays, the Atkinson Cycle is beginning to be used in modern hybrid electric application.3. Design:
The original engine of the Atkinson-cycle allows the product, compression, power, and movement of exhaust four-stroke cycle to occur in a single turn of the crankshaft , and was designed to bypass existing patents covering Otto cycle engines. This is due to the unique crankshaft design that allows an expansion ratio to be different from the compression ratio. Adjusting the mesh...
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