objective of the study of 6 stroke engine

Topics: Internal combustion engine, Diesel engine, Six-stroke engine Pages: 7 (2113 words) Published: November 16, 2013
Six-stroke engine
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The six-stroke engine is a type of internal combustion engine based on the four-stroke engine, but with additional complexity intended to make it more efficient and reduce emissions. Two types of six-stroke engine have been developed since the 1890s: In the first approach, the engine captures the heat lost from the four-stroke Otto cycle or Diesel cycle and uses it to power an additional power and exhaust stroke of the piston in the same cylinder. Designs use either steam or air as the working fluid for the additional power stroke.[1] The pistons in this type of six-stroke engine go up and down three times for each injection of fuel. There are two power strokes: one with fuel, the other with steam or air. The currently notable designs in this class are the Crower six-stroke engine, invented by Bruce Crower of the U.S.; the Bajulaz engine by the Bajulaz S.A. company of Switzerland; the Velozeta Six-stroke engine built by the College of Engineering, at Trivandrum in India; and the NIYKADO Six Stroke Engine invented by Chanayil Cleetus Anil, NIYKADO Motors, India under patent number IN252642 granted on 25 May 2012. The second approach to the six-stroke engine uses a second opposed piston in each cylinder that moves at half the cyclical rate of the main piston, thus giving six piston movements per cycle. Functionally, the second piston replaces the valve mechanism of a conventional engine but also increases the compression ratio. The currently notable designs in this class include two designs developed independently: the Beare Head engine, invented by Australian Malcolm Beare, and the German Charge pump, invented by Helmut Kottmann. Contents

1 Engine types
1.1 Single piston designs
1.1.1 Griffin six-stroke engine
1.1.2 Bajulaz six-stroke engine
1.1.3 Velozeta six-stroke engine
1.1.4 NIYKADO Six Stroke Engine
1.1.5 Crower six-stroke engine
1.2 Opposed piston designs
1.2.1 Beare Head
1.2.2 M4+2
1.2.3 Piston charger engine
2 Related U.S. patents
3 Related Indian Patents
4 Notes
5 References
6 External links
Engine types[edit]
Single piston designs[edit]
These designs use a single piston per cylinder, like a conventional two- or four-stroke engine. A secondary, non-detonating fluid is injected into the chamber, and the leftover heat from combustion causes it to expand for a second power stroke followed by a second exhaust stroke. Griffin six-stroke engine[edit]

In 1883, the Bath-based engineer Samuel Griffin was an established maker of steam and gas engines. He wished to produce an internal combustion engine, but without paying the licensing costs of the Otto patents. His solution was to develop a "patent slide valve" and a single-acting six-stroke engine using it. By 1886, Scottish steam locomotive maker Dick, Kerr & Co. saw a future in large oil engines and licensed the Griffin patents. These were double acting, tandem engines and sold under the name "Kilmarnock".[2] A major market for the Griffin engine was in electricity generation, where they developed a reputation for happily running light for long periods, then suddenly being able to take up a large demand for power. Their large heavy construction didn't suit them to mobile use, but they were capable of burning heavier and cheaper grades of oil. The key principle of the "Griffin Simplex" was a heated exhaust-jacketed external vapouriser, into which the fuel was sprayed. The temperature was held around 550 °F (288 °C), sufficient to physically vapourise the oil but not to break it down chemically. This fractional distillation supported the use of heavy oil fuels, the unusable tars and asphalts separating out in the vapouriser. Hot bulb ignition was used, which Griffin termed the "Catathermic Igniter", a small isolated cavity connected to the combustion chamber. The spray injector had an adjustable inner nozzle for the air supply, surrounded by an annular...
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