1. Introduction
Diesel Engine

2. Brief History
In 18th century gasoline and steam engines have low efficiency.
Low efficiency in these engines inspired Rudolf to make engine with high efficiency.
In 1878, Rudolf diesel invented the compression-ignition engine.
By 1893 Diesel had obtained a patent for his engine what we know called the diesel engine.

3. Types of Diesel Engine
Two Stroke
Four Stroke

4. Working (Two Stroke)
When the piston is at BDC, it uncovers the air intake valves. Air fills in the cylinder.
Piston compresses the air. Diesel fuel is sprayed into the cylinder, it ignites. This is the compression stroke.
The pressure created by the combustion of the fuel drives the piston downward. This is the power stroke.
As the piston nears the bottom of its stroke, all of the exhaust valves open. Exhaust gases rush out of the cylinder.
Engine Demo

5. Working(Four Strokes)
Intake stroke: Intake valves open letting in air moving the piston down.
Compression stroke: Piston moves back & compresses air.
Combustion stroke: As the piston reaches the top, fuel is injected at the right time, ignited, forces the piston move back.
Exhaust stroke: Piston moves back to the top, pushing out the exhaust created from the combustion out of the exhaust value.
Engine Demo

6. Two Stroke V/S Four Stroke
Two stroke engines has to make one revolution to produce a power stroke. This gives two stroke engine more power.
More polluting.
Fuel efficiency is less.
Four stroke engines has to make two revolutions to produce power stroke.
Less polluting.
Fuel efficiency is more.

7. Diesel Engine V/S Gasoline Engine
The air is compressed first, and then the fuel is injected.
Has no spark plug combustion is due to the heat of compressed air.
High compression ratio.
Produce more noise pollution.
Gives maximum 35-40% efficiency.
Fuel is mixed with air,
compressed by pistons and ignited by sparks from spark plugs.
Has spark plug for ignition.
Low compression ratio.
Produces less noise pollution.
Gives mximum25% efficiency.