The force released with the ignition pushes the piston downwards. We see this process between the dots c en d. Power stroke: After the spark plug sparks, it takes some time for the mixture to burn completely.At the end of the compression stroke, ignition takes place The red line shows this between the dots b en c. The air volume decreases while the pressure increases. Compression stroke: The piston moves up and compresses the air.The red line in the indicator diagram extends from a to b The volume increases because the space above the piston becomes larger and larger. Intake stroke: The piston moves from TDC to ODP and sucks the air in.We can view the indicator diagram in four different situations: Pressure profile during the four-stroke process of a gasoline engine:
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