DK28 diesel engine accessories introduces the basic structure parameters of top dead center and bottom dead center of diesel engine

The main engine has a main shaft, which passes through the hull at the stern and is attached to the propeller. After the main engine starts up, the main shaft is driven to rotate, the main shaft drives the propeller to rotate, and the hull can overcome the resistance of the ship to move forward.

This is the most basic principle that the ship host can promote the ship forward, probably in junior high school physics learning stage have been exposed to.

The main engine plays an important role, the structure is complex, and the technical content of fault and maintenance work is high.

Top dead center (TDC)

Refers to the piston in the cylinder movement can reach the top position. When the piston reaches TDC, it is farthest from the center line of the crankshaft. The center line of the crankshaft is the horizontal Z length dot line.

In a diesel engine, diesel fuel is injected into the cylinder at top dead center through a fuel injection system, then compressed by the piston, and finally burned after ignition to release energy and push the piston downward. Accurate control of the TDC position is critical to engine performance and fuel efficiency.

Bottom dead center (BDC)

Refers to the bottom position of the piston in the cylinder, that is, the position of the piston closest to the center line of the crankshaft.

In a diesel engine, when the piston reaches bottom dead center, the exhaust gas exits the cylinder through the exhaust valve and then enters a new working cycle. The position of the bottom dead center of the piston also has a certain impact on the performance and fuel efficiency of the engine, as it involves the process control of the intake and exhaust air.