The term C.I. Engine stands for Compression Ignition Engine. It is the type of engine in which air alone is admitted into the cylinder, compressed to a very high temperature and pressure, then ignited by injection diesel oil into the highly compressed air to burn and produce a very high pressure or power that forces the piston down the cylinder to rotate the crankshaft.
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| Internal Combustion Engine |
Compression ignition engine is also called diesel engine because the fuel used in this type of engine is a light oil called diesel. Compression ignition engines are internal combustion engines. They may be 2-stroke or 4-stroke as its petrol counterpart.
Sequence of Operation of the four-stroke compression Ignition Engine.
Induction Stroke
During this stroke, the inlet valve opens, and the exhaust valve closes. The pistons moves down drawing-in only air into the cylinder.
During this stroke, the inlet valve opens, and the exhaust valve closes. The pistons moves down drawing-in only air into the cylinder.
Compression Stroke
During this stroke, both valves are closed. The piston moves upward from (B.D.C to T.D.C) compressing the air only, and increasing its pressure and temperature.
During this stroke, both valves are closed. The piston moves upward from (B.D.C to T.D.C) compressing the air only, and increasing its pressure and temperature.
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| Four strokes IC Engine |
Power Stroke
Both valves remain closed. As the piston approaches the T.D.C. During the compression stroke, atomized diesel fuel is injected into the highly compressed charge, as it ignites and burns, causing
Both valves remain closed. As the piston approaches the T.D.C. During the compression stroke, atomized diesel fuel is injected into the highly compressed charge, as it ignites and burns, causing
very high pressure which forces the piston downward into the cylinder to rotate the crankshaft.
Exhaust Stroke
During the exhaust stroke, the inlet valve remains closed, while the exhaust valve opens, the piston moves upward into the cylinder and pushes out the burnt gases.
During the exhaust stroke, the inlet valve remains closed, while the exhaust valve opens, the piston moves upward into the cylinder and pushes out the burnt gases.
This cycle is repeated over and over as long as the engine is in motion
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