16/06/2025
The image illustrates the inner workings of a PETROL engine, a type of internal combustion engine that utilizes the heat of compression to ignite fuel and generate power.
Here’s a breakdown of the key components and processes:
Components:
Piston: The orange part that moves up and down within the cylinder, compressing the air.
Cylinder: The chamber where the piston moves.
Camshaft: The rotating shaft with lobes that control the opening and closing of valves.
Crankshaft: The rotating shaft that converts the linear motion of the piston into rotational motion.
Valves: Control the flow of air into and out of the cylinder.
Process:
Air Intake: Air enters the cylinder through the intake valve.
Compression: The piston moves upward, compressing the air within the cylinder, which increases the air’s temperature.
Fuel Injection: Diesel fuel is injected into the hot, compressed air, causing it to ignite spontaneously.
Power Stroke: The combustion of the fuel forces the piston downward, generating power.
Exhaust: The exhaust valve opens, and the piston moves upward, pushing the burnt gases out of the cylinder.
Key Differences from Petrol Engines:
Diesel engines use compression ignition, while petrol engines use spark plugs to ignite the fuel-air mixture.
Diesel engines have a higher compression ratio than petrol engines, resulting in higher combustion pressure and a more forceful process.
engines inject fuel directly into the combustion chamber, while petrol engines mix fuel and air before compression.
