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Atkinson cycle
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==Atkinson "Differential Engine"== The first implementation of the Atkinson cycle was in 1882; unlike later versions, it was arranged as an [[opposed-piston engine]], the Atkinson differential engine.<ref>{{cite book | last = Gingery | first = Vincent | title = Building the Atkinson Differential Engine | year = 2000 | publisher = David J. Gingery Publishing, LLC | isbn = 1878087231 }}</ref><ref name=pat336505 /> In this, a single crankshaft was connected to two opposed pistons through a toggle-jointed linkage that had a nonlinearity; for half a revolution, one piston remained almost stationary while the other approached it and returned, and then for the next half revolution, the second-mentioned piston was almost stationary while the first approached and returned. Thus, in each revolution, one piston provided a compression stroke and a power stroke, and then the other piston provided an exhaust stroke and a charging stroke. As the power piston remained withdrawn during exhaust and charging, it was practical to provide exhaust and charging using valves behind a port that was covered during the compression stroke and the power stroke, and so the valves did not need to resist high pressure and could be of the simpler sort used in many steam engines, or even [[reed valve]]s. {{gallery |File:US336505-Atkinson Opposed Piston Engine.png|Patent drawing of the Atkinson "Differential Engine", 1882 |File:Atkinson Opposed Piston Engine.gif|Animation of the Atkinson differential engine, 1882 }}
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