OTTO CYCLE Objective: Explain what is the Otto cycle, how it works and application By: Jonathan Tang.

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Presentation transcript:

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

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

4 Strokes of the Otto Cycle Cycle contains 4 strokes 1)Intake stroke 2)Compression stroke 3)Power stroke 4)Exhaust stroke

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.

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

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

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.html