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Atkinson Cycle Engines

Atkinson Cycle Engines. Jacob Reagan. Brief History. Invented in 1882 by British engineer James Atkinson Patents for the existing Otto-cycle engine presented a need for a new crankshaft design Between 1886 and 1893 the British Gas Company built over 1000 Atkinson-cycle engines.

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Atkinson Cycle Engines

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  1. Atkinson Cycle Engines Jacob Reagan

  2. Brief History • Invented in 1882 by British engineer James Atkinson • Patents for the existing Otto-cycle engine presented a need for a new crankshaft design • Between 1886 and 1893 the British Gas Company built over 1000 Atkinson-cycle engines Figure 1: The Atkinson Cycle engine patent: 1887 [1]

  3. Atkinson-Cycle Engines • Operates on a four-stroke cycle • Intake, compression, combustion, and exhaust strokes occur in a one revolution of crankshaft • Combustion stroke is longer than compression stroke allowing more expansion of combustion gases • Greater efficiency when compared to Otto engines Figure 2: The Atkinson Cycle Engine [1]

  4. Thermodynamics of Atkinson-Cycle Engine 1. Reversible adiabatic compression 2. Heat addition at constant volume 3. Isentropic expansion 4. Heat rejection at constant pressure Figure 3: The Atkinson Cycle P-v Diagram [2]

  5. Atkinson-Cycle Engines Continued • Biggest disadvantage is reduction in power density (power/unit volume) arising from the reduction in air intake • Atkinson cycle engine can be supplemented with electric motor to provide more power if needed • Electric motors can be used in combination or independent of Atkinson cycle engines to provide the desired power output most efficiently

  6. Atkinson-Cycle Engines Today

  7. Questions?

  8. Sources [1] Unusual Internal-Combustion Engines, “The Atkinson Cycle Engine”, (Electronic Database), (Cited 10-28-09) http://www.dself.dsl.pipex.com/MUSEUM/POW ER/unusualICeng/atkin son/ atkinson.htm [2] Wikipedia, “Atkinson Cycle”, (Electronic Database), (Cited 10-28-09) http://en.wikipedia.org/wiki/Atkinson_cycle

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