Single Piston
models:
·
The
Bajulaz 6 Stroke Engine:
It was invented in 1989 by Roger Bajulaz of the Bajulaz S.A Company in
Geneva, Switzerland. It is similar to a conventional engine with 2 additional
fixed capacity chambers in the cylinder head. One of the two fixed capacity
chambers is a combustion chamber and the other is an air pre-heating chamber.
The combustion chamber receives a charge of heated air from the cylinder and
simultaneously fuel is injected into it. Both air and fuel mix in the
combustion chamber and is compressed and burnt to a high pressure. The high
pressure gained is then sent to the cylinder to achieve the power stroke.
Meanwhile, the air pre-heating chamber heats the air to a high degree. The
chamber is in the surrounding of the cylinder wall so that the air is heated
due to the combustion process inside the cylinder. The heated air is sent to
the cylinder during the 5th stroke.
The fuel consumption can be reduced dramatically by up to 40% and also
the pollution is significantly reduced.
·
Velozeta
6 Stroke Engine:
In
this type, air is injected at the end of exhaust stroke (4th stroke)
so that the air expands due to the heat in the chamber and provided a
supplementary expansion stroke. It is more of a gas scavenging process to clean
up the combustion chamber completely before next air-fuel intake stroke. This engine
showed 40% reduction in fuel consumption and was developed in the year 2005 by
a team of Mechanical engineering students from India; U Krishnaraj, Boby
Sebastian, Arun Nair and Aaron Joseph from College of Enginnering located in
Trivandrum.
·
Dyer 6
Stroke Engine:
It was invented in 1915 and it uses water as the working fluid after
exhaust stroke. Water is injected into the combustion chamber after exhaust
stroke which is instantaneously converted into steam. The steam expands and
forces the piston down from TDC to BDC to provide an additional power stroke. Later
in 2006, Bruce Crower applied a patent for an engine working on similar
principle.
·
NIYKADO 6
Stroke Engine:
This
engine was designed and patented by Chanayil Cleetus Anil of Kochi, India in
2012. The model works on air injection at the end of exhaust stroke and it claims
to be 23% more fuel efficient than a conventional 4 stroke engine.
Opposed Piston
Models:
·
Beare
Head:
It
was designed by Malcolm Beare of Australia. This design allows 2 opposing
pistons to move in a single combustion chamber. One piston is used for 4 stroke
operation at the bottom end and the other opposing piston moves at half the
rate of the 4 stroke piston. The opposing piston replaces the valve mechanism
by opening and closing the inlet and exhaust ports. It claims to increase the
power by 9%.
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