OTTO CYCLE

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OTTO CYCLE

• Objective Explain what is the Otto cycle, how it
  works and application
• By Jonathan Tang

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Otto Cycle

• Also known as 4 stroke cycle in technical terms
• A Cycle used in internal combustion engines
• The first such engine was built by the German
  engineer Otto in 1861

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4 Strokes of the Otto Cycle

• Cycle contains 4 strokes
• 1)Intake stroke
• 2)Compression stroke
• 3)Power stroke
• 4)Exhaust stroke

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• Intake stroke
  
  
• Compression stroke

- Intake valve opens and a mixture of air and
fuel with a relatively low pressure (near
atmosphere) is drawn into the cylinder. As piston
begin to move back up, intake valve closes.
-With both valve closed, the fuel-air mixture is
compressed by the upward movement of piston,
causing a rise in pressure.
5

• Power Stroke
• Exhaust Stroke

-The mixture is ignited by spark plugs with the
piston staying nearly fixed, leading to a rise in
pressure and temperature. -The hot gas is then
allowed to do work by pushing the piston back.
-The exhaust valve is opened and some exhaust
escapes with the piston remaining fixed. -The
piston forces the remaining exhaust to escape.
The exhaust valve is then closed, the intake
valve opened, and the cycle repeats
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Applications

• Common cycle used in internal combustion engines.
• Otto cycle (4 stroke) engines are commonly used
  in most cars and trucks today
• Conclusion
• Otto cycle engines are most commonly used compare
  to 2 stroke or Wankel (rotary) engine

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References

• http//en.wikipedia.org/wiki/Otto_cycle
• http//scienceworld.wolfram.com/physics/OttoCycle.
  html
• http//www.keveney.com/otto.html
• http//www.grc.nasa.gov/WWW/K12/airplane/engopt.ht
  ml