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four-stroke cycle
(redirected from Otto-cycle)

   Also found in: Wikipedia, Hutchinson 0.01 sec.
four-stroke cycle [¦fȯr ¦strōk ′sī·kəl]
(mechanical engineering)
An internal combustion engine cycle completed in four piston strokes; includes a suction stroke, compression stroke, expansion stroke, and exhaust stroke.


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The engine operates on the Atkinson cycle, which provides thermal efficiency as compared to the conventional Otto-cycle engine, which generally has a higher exhaust gas temperature, and provides a clean burn, which contributes to the California SULEV emissions certification and Tier 2 Bin 3 in other states.
The next two key milestones came during the 1880s, with the invention by Benz, Daimler and Maybach of the gasoline-fuelled Otto-cycle internal combustion engine and the patenting of Charles Parsons' steam turbine.
There are Otto-cycle and Stirling engines, and there is the form of carbon called "buckminsterfullerene" (bucky-balls), on the short list of examples.
 
 
 
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