OTTO CYCLE Objective Explain what is the Otto

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 n A Cycle used in internal combustion engines n The first such engine was built by the German engineer Otto in 1861 n

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

n Intake 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. n Compression stroke -With both valve closed, the fuel-air mixture is compressed by the upward movement of piston, causing a rise in pressure.

-The mixture is ignited by spark plugs with the piston staying nearly fixed, leading to a rise in pressure and temperature. n Power Stroke -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. n Exhaust Stroke -The piston forces the remaining exhaust to escape. The exhaust valve is then closed, the intake valve opened, and the cycle repeats

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

References n n http: //en. wikipedia. org/wiki/Otto_cycle http: //scienceworld. wolfram. com/physics/Otto. Cycle. html http: //www. keveney. com/otto. html http: //www. grc. nasa. gov/WWW/K 12/airplane/engopt. html