Working Of A Four Stroke Diesel Engine

Hey, Guys;

At the present situation in the modern world, everywhere there is a two-wheeler or four-wheeler mostly 70.0% of the vehicles are running in the diesel engine. Now today's topic we are going to see about working of a four-stroke diesel engine and the working principles of the four-stroke diesel engine and the concept behind it. The name itself it images four-stroke, so it has four different components to work on it. Now we are going to see details about the four-stroke diesel engine and the working principle and the concept. In the last topic, we have discussed the four-stroke petrol engine now we are going to see about working of a four-stroke diesel engine.

1. Suction Stroke

2. Compression Stroke

3. Power Stroke

4. Exhaust Stroke

These are the four-stroke of the petrol engine let's see deeply of the petrol engine.

This is similar to the operation of a four-stroke petrol engine. Instead of the petrol-air mixture, only air is sucked from the atmosphere during the suction stroke. In a diesel engine, there is no need for a spark plug. Diesel engines are also called as a compression ignition engines. Dr. Rudolf Diesel who invented the compression ignition engine was born in 1858.

• Suction Stroke:

During this stroke, the inlet valve is kept open and the exhaust valve kept closed. The piston comes down to the bottom dead center (BDC) from the top dead center (TDC). Pressure in the cylinder will be slightly less than the atmospheric pressure. Petrol-air in the correct proportion from the carburetor is drawn inside the engine cylinder through the inlet valve. It is also similar to the four-stroke petrol engine.

• Compression Stroke:

In this stroke, both the inlet valve and the exhaust valve are kept closed. The air is compressed when the piston moves up to the top dead center to the bottom dead center. The compression ratio varies from 15-20 for the diesel engines. Due to the high compression, a higher temperature is obtained in the range of 550 degree C. At this junction, diesel oil at high pressure is injected inside the hot compressed air in an atomized form. Due to the special shape of the combustion chamber. the mixture of the fuel and air takes place very rapidly and the mixture is ignited due to the high compression ratio, without any help of a spark plug. So, the diesel engine is also called compression ignition engine. Due to combustion, very high pressure is produced.

• Working or Power Stroke:

During this stroke, both the inlet valve and the exhaust valve are kept closed. The piston is pushed form the top dead center to the bottom dead center. The force above the piston is transmitted to the crankshaft through the connecting rod and the crank mechanism. Excess energy due to the combustion chamber is stored in the flywheel which helps the operation of three idle strokes.

• Exhaust Stroke:

During this stroke, the inlet valve is kept closed and the exhaust valve is kept open. The piston moves up from the bottom dead center to the top dead center. The waste gases are sent out to through the exhaust valve and the cycle is repeated.

During these four strokes, the crankshaft will make two revolutions. The thermal efficiency of a four-stroke engine is higher compared to a two-stroke cycle engine. Most of the cars operate on a 4-stroke cycle.