shows the basic four stroke internal combustion engine. This process consists of four distinct strokes, hence the name. During the intake stroke, the piston moves down in the cylinder and the intake valve opens. This draws a fresh fuel/air mixture into the cylinder. As the piston moves back up, the intake valve closes, and the air is compressed. This is the compression stroke. At the beginning of the power stroke, the now highly compressed fuel/air mixture is introduced to spark via an ignition source. This causes combustion, adding heat to the process. A rapid expansion of gasses applies pressure to the piston, forcing it down, converting the potential energy stored in the fuel to kinetic energy. After the power stroke, the exhaust valve opens and the piston returns to TDC, exhausting the combusted fuel/air mixture, finishing the exhaust stroke.
As earlier mentioned, for the purpose of analysis, this four stroke process is converted to an idealized air standard cycle. In this case, the Otto cycle is used, represented
shows the basic four stroke internal combustion engine. This process consists of four distinct strokes, hence the name. During the intake stroke, the piston moves down in the cylinder and the intake valve opens. This draws a fresh fuel/air mixture into the cylinder. As the piston moves back up, the intake valve closes, and the air is compressed. This is the compression stroke. At the beginning of the power stroke, the now highly compressed fuel/air mixture is introduced to spark via an ignition source. This causes combustion, adding heat to the process. A rapid expansion of gasses applies pressure to the piston, forcing it down, converting the potential energy stored in the fuel to kinetic energy. After the power stroke, the exhaust valve opens and the piston returns to TDC, exhausting the combusted fuel/air mixture, finishing the exhaust stroke.
As earlier mentioned, for the purpose of analysis, this four stroke process is converted to an idealized air standard cycle. In this case, the Otto cycle is used, represented
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