Atkinson Cycle Engines

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Presentation transcript:

Atkinson Cycle Engines Jacob Reagan

Figure 1: The Atkinson Cycle engine patent: 1887 [1] 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]

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]

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]

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

Atkinson-Cycle Engines Today

Questions?

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