FOUR STROKE COMPRESSION IGNITION / INJECTION ENGINES (CI ENGINES)

FOUR STROKE compression IGNITION ENGINES

(cI ENGINES)

Four working processes done in four individual strokes and 

Valves (Inlet and Exhaust valves) are there in 4 stroke engines.

• Suction -------------- Piston moves from TDC to BDC.
• Compression ------- Piston moves from BDC to TDC.
• Power --------------- Piston moves from TDC to BDC.
• Exhaust ------------- Piston moves from BDC to TDC.

• Suction----------: Inlet valve open and exhaust valve closed.
• Compression---: Inlet valve and exhaust valve both are closed.
• Power-----------: Inlet valve and exhaust valve both are closed.
• Exhaust---------: Exhaust valve open and inlet valve closed.

• Suction : Air entry into the engine due to increase of cylinder volume by piston movement.

• Compression : Due to decrease of cylinder volume by piston  movement, the air gets high pressure and temperature and at the end of compression, the fuel is injected  from fuel injector  and combustion takes place.

• Power : During power the piston moves from TDC to BDC. Its nothing but working stroke.

• Exhaust : During this process, the exhaust gases leaves from engine cylinder.

Composed by:  R.Satheesh, M.E., Asso Prof., email: rsatheeshemail@gmail.com.