STROKE IC ENGINE



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INTRODUCTION
History of the IC engine[1]:

Nikolaus August Otto first designed what is known as the Otto engine
or simply the 4 stroke internal combustion engine. Conversion of heat energy
liberated by the combustion of the fuel into mechanical energy which rotated the
crankshaft was the basic principle of this engine. The 4 stroke engine worked on the
principle of the Otto cycle .The 4 stroke engine comprises of the intake stroke,
compression stroke, power stroke and finally the exhaust stroke. Fuel was injected in
the intake stroke and power from the fuel was derived in the 3rd stroke i.e. the power
stroke which used the heat energy released by the combustion of the fuel. This 4
stroke engine forms the basis of all modern vehicles used till date.


Concept of the 6 stroke IC engine:

The 6 stroke ICE is an advancement over the existing 4 stroke ICE which employs
the same principle as that of the 4 stroke ICE. The 5th stroke or the second power
stroke uses the heat evolved in the exhaust stroke (directly or indirectly) as heat
required for the sudden expansion of the secondary fuel (air or water) which
pushes the piston downward for the 2nd power stroke thereby rotating the
crankshaft for another half cycle. As heat evolved in the 4th stroke is not wasted,
the requirement for a cooling system is eliminated.


External combustion cycle:
In this cycle there is no contact between the air and the heating source.
The events which take place are as follows:
(Refer graph)
e1. (Event 1): Pure air intake in the cylinder (dynamic event).
e2. (Event 2): Compression of pure air in the cylinder (dynamic event).
e3. (Event 3): Keeping pure air pressure in closed chamber where a maximum heat
exchange occurs with the combustion chamber walls, without direct action on the
crankshaft (static event).