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The Otto Cycle
Jonathan Cheung4M-F
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Background Information:• The Otto cycle is commonly known
as the four-stroke cycle used in internal combustion engines
• Invented by Nikolaus Otto in 1876
• Most commonly used for automotive and industrial purposes today
• Examples: Conventional gasoline, petroleum, and diesel engine in cars, trucks, and generators
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The Process of the Cycle:
1. Intake stroke
2. Compression stroke
3. Ignition/Explosion
4. Power Stroke
5. Valve exhaust
6. Exhaust stroke
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Intake Stroke Compression Stroke
Ignition/ExplosionPower StrokeExhaust stroke
Starting Position
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Advantages of an Otto Cycle Engine:
Drawbacks:
• Relatively good thermodynamic efficiency• Relatively inexpensive to maintain and build • Excellent power-to-weight ratio • Good reliability
• Requires more moving parts and manufacturing expertise
• Engine is usually larger and heavier than a two-stroke engine or rotary engine of comparable power output.
Conclusion:• The Otto Cycle continues to be an integral and effective
combustion cycle amongst many engines because it provides excellent efficiency and power output.
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References:
• http://auto.howstuffworks.com/engine.htm
• http://home.earthlink.net/~graham1/MyToyotaPrius/Understanding/InternalCombustion.htm
• http://en.wikipedia.org/wiki/Otto_cycle
• http://www.keveney.com/otto.html