Please enable JavaScript.
Coggle requires JavaScript to display documents.
THE DIESEL ENGINE - Coggle Diagram
THE DIESEL ENGINE
-
HOW DOES IT WORKS?
INTAKE
During the intake stroke the intake valves get opened by the camshaft and, inside the cylinder enters the air. In this phase the piston is getting down to suck the air
COMPRESSION
The piston finally gets up and, by doing this compresses the air which consequently gets increased the pression and the heat
COMBUSTION
The higher temperature reached as compared to the petrol engine, make the combustion possible if the fuel gets added to the air. This mechanism happens thank to the fuel injector. In this stroke is generated all the energy which the other strokes need. The piston is pushed to the bottom dead center
EXHAUST
In this stroke the camshaft opens the exhaust valves letting the exhaust gas be exhausted in the atmosphere. In this stroke the piston pushes the exhaust gas outside the cylinder reaching the top dead center
MECHANICAL PARTS
CRANKSHAFT
Cranckshaft role is to transmit the motion created by the combustion of air-fuel mixture to the gear and, finally to the wheels
PISTONS
The piston's role is to absorb the energy emitted by the combustion and transorm it in kinetic energy which produces motion
TIMING BELT
The timing belt connects the camshafts to the crankshaft in order to permit that at a certain rotation of the crankshaft, the camshafts rotate of a certain angle
CONNECTING RODS
Connecting rod connects the rod journal to the piston and this part is able to tranform linear movement into circular movement
FUEL INJECTOR
Fuel injector's role is to spray the fuel vaporised in the chamber. The high temperature of the air makes the mixture explode
VALVES
The intake and exhaust valves manage the intake and the exhaust stroke by opening or closing themselves
-
CYLINDER
It's the place where all the strokes happen. The main points of the cylinder are the top dead center and the bottom dead center. The distance between TDC and BDC is called engine displacement. The ratio between the volume of the air when the piston at TDC and the one at BDC is called compression ratio and this ratio is higher in the Diesel engine than in the petrol engine because it's required to get the air temperature much higher than in the Petrol one.