The Otto cycle is the most common type of engine cycle used in spark-ignition internal combustion engines. It is named after Nikolaus Otto, who invented the first internal combustion engine in 1867.
The Otto cycle consists of four strokes:
1. Intake stroke
2. Compression stroke
3. Power stroke
4. Exhaust stroke
1. Intake Stroke:
The intake stroke begins with the piston moving down the cylinder. This creates a vacuum that draws air and fuel into the cylinder through the intake valve. The intake valve closes once the cylinder is full.
2. Compression Stroke:
The compression stroke begins with the piston moving up the cylinder. This compresses the air and fuel mixture, increasing the pressure and temperature of the mixture.
3. Power Stroke:
The power stroke begins when the spark plug ignites the air and fuel mixture. This causes a rapid expansion of the gases, pushing the piston down the cylinder. The expansion of the gases also creates power, which is transmitted to the crankshaft.
4. Exhaust Stroke
The exhaust stroke begins with the piston moving up the cylinder. This forces the exhaust gases out of the cylinder through the exhaust valve. The exhaust valve closes once the cylinder is empty.
