How does an Automobile engine work? | Working of Internal combustion engines.



What is an Automobile? | Why it is called as an Automobile?
An automobile is a self-propelled vehicle driven by an internal engine which is used for transportation. Mobile means which can move Automobile means which itself can move.
First Automobile was invented in Germany.

How does an Automobile engine work? | Working of Internal combustion engines.


History of Automobiles?

In 1769 the French engineer Nicolas-Joseph Cugnot invented first steam power road vehicle. With the highest speed of 2.5 Meter per Hour. With the technological advancements, Siegfried Samuel Marcus an automobile engineer in the year of 1808 discovered the Gasoline engine (Petrol engine).

In the year of 1861 German engineer invented Four stroke petrol engine which we use till date with some minor technological advancements. Rudolf Christian Karl Diesel of Germany invented Four stroke diesel engine. 

Classification of Automobiles 

There are mainly five types of automobile engines they are Petrol engine, Diesel engine, Steam engine, Gas engine and electric engine based on the input given.

But mainly we use Petrol and Diesel-powered engines.


How does an Automobile engine work? | Working of Internal combustion engines.


Parts of an Automobile engine(Internal Combustion Engine).

An Automobile engine is called an Internal combustion engine(IC Engine) because the combustion process takes place internally.

Before entering into the working let us understand some important parts of an IC Engine (Automobile engine) so that we can understand its working very easily.


How does an Automobile engine work? | Working of Internal combustion engines.


1. Cylinder
A cylinder is a path that guides the piston to move in a to and fro motion i.e up and down movement.
(Reciprocating motion) which carries the gas under pressure while an Automobile is moving.

2. Piston
The piston moves in to and fro motion (Reciprocating motion)  thus transfers the motion to connecting rod.

Connecting rod further connects crank which converts to and fro motion to rotary motion.

3. Connecting rod
The connecting rod is linked to the piston on one end and crank on another end. Its main function is to convert the to and fro motion of the piston to rotary motion with a crank.

4. Crank
As we discussed that Crank will have a rotary motion which is required for the wheels to turn. This rotary motion of crank is transmitted to wheels. Thus an automobile moves. 

5. Inlet Valve
in the inlet valve the fuel enters inside the engine thus combustion takes place.

6. Exhaust valve
Though exhaust valve the hot flue gases are removed out of the engine. 

7. Spark plug
Spark plug generates sparks to lit the fuel so that the combustion takes place. Oly petrol engines have spark plugs.

Note - Diesel engines do not have Spark plugs.


How does an Automobile engine work?

How does an Automobile engine work? | Working of Internal combustion engines.
Single and Multi Cylinder IC Engine(Automobile engine)

Sequence of operation

1. Suction stroke
In this stroke, through the inlet valve, the air-fuel mixture with a correct proportion is entered inside the cylinder.
The piston moves from Top dead center(TDC) to bottom dead center(BDC). Which creates a suction effect.

2. Compression stroke
In this stroke, both inlet and exhaust valves remain closed the piston moves from Bottom to Top now the fuel is compressed at a high temperature and pressure.

3. Expansion stroke
In this stroke, the piston moves from top to bottom and the spark plug lits fire thus high temperature is produced. 

4. Exhaust stroke
In this stroke, the piston moves from bottom to top and removes the flue gases to the atmosphere through the exhaust valve. 


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