31-01-2012, 03:54 PM
Atkinson cycle engine
Atkinson+Cycle+Engines.ppt (Size: 378 KB / Downloads: 275)
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
Thermodynamics of Atkinson-Cycle Engine
1. Reversible adiabatic compression
2. Heat addition at constant volume
3. Isentropic expansion
4. Heat rejection at constant pressure
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.ppt (Size: 378 KB / Downloads: 275)
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
Thermodynamics of Atkinson-Cycle Engine
1. Reversible adiabatic compression
2. Heat addition at constant volume
3. Isentropic expansion
4. Heat rejection at constant pressure
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