27-09-2014, 02:27 PM
DTSI
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Abstract
It is very interesting to know about complete combustion in automobile
engineering, because in actual practice, perfect combustion is not at all
possible due to various losses in the combustion chamber as well as
design of the internal combustion engine. Moreover the process of
burning of the fuel is also not instantaneous. However an alternate
solution to it is by making the combustion of fuel as fast as possible.
This can be done by using two spark plugs which spark alternatively at
a certain time interval so as increase the diameter of the flame & burn
the fuel instantaneously. This system is called DTSI (Digital
Spark Ignition system). In this system, due to twin sparks,
combustion will be complete.
This paper represents the working of digital twin spark ignition system,
how twin sparks are produced at 20,000 Volts, their timings, efficiency,
advantages & disadvantages, diameter of the flame, how complete
combustion is possible & how to decrease smoke & exhausts from the
exhaust pipe of the bike using Twin Spark System.
Introduction
A conventional 4 Stroke engine has a Single Spark Plug located at one
end of the combustion chamber and hence the combustion is inefficient
leading to sub optimal mileage and sub optimal performance & can
even have problems with oil flow. Hence forth there was a requirement
to change engines' design, fuelling, ignition, production and quality to
achieve the following objectives. Uniform power delivery in all
operating conditions:-
A high degree of drivability
First rate standards of reliability
Long service life.
With a view to overcome the above limitations a new patent was
introduced that is known as DTS-I technology & its use is increasing
day by days.
Main characteristics
Digital electronic ignition with two plugs per cylinder and two
ignition distributors;
Twin overhead cams with camshaft timing variation;
Injection fuel feed with integrated electronic twin spark ignition;
A high specific power;
Compact design and Superior balance;
This power unit, equipping the naturally aspirated 2-litre used on the
Alfa 164, is a direct dilative of the engine fitted on the 2.0 Twin Spark
version of the Alfa 75, a recent addition to the Alfa car range. It
includes a number of exclusive engineering solutions resulting in
superior power output and exceptional peak torque for this cylinder
capacity. Its main characteristics are:
Engine construction
The engine used on the Alfa 164 T. Spark is a four-in-line cylinder unit
whose weight has been considerably reduced with all aluminium-alloy
engine block, cylinder head, oil sump and tappet covers.
Eight counterweights ensure optimal balancing of the high strength
nitride steel crankshaft.
The pressed-in cast iron cylinder liners feature wet mounting for more
effective heat dissipation.
Advantages of using Twin Spark
Less vibrations and noise
Long life of the engine parts such as piston rings and valve stem.
Decrease in the specific fuel consumption
No over heating
Increase the Thermal Efficiency of the Engine & even bear high
loads on it.
Better starting of engine even in winter season & cold climatic
conditions or at very low temperatures because of increased
Compression ratio.
Because of twin Sparks the diameter of the flame increases rapidly
that would result in instantaneous burning of fuels. Thus force
exerted on the piston would increase leading to better work output.
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Disadvantages of using Twin Spark
There is high NOx emission
If one spark plug get damaged then we have to replace both
The cost is relatively more
You spend double the amount on spark plugs when it is time to
replace them.
The engine tends to overheat and loose power at higher speeds
as compared to a single plug engine.
In case the Engine is kept unused for a long time soiling of
spark plugs occur. Twin Spark system helps to reduce this
problem
Conclusion
Hence it can be concluded that the application of these technologies in
the present day automobiles will give the present generation what they
want i.e. power bikes with fuel efficiency. Since these technologies
also minimize the fuel consumption and harmful emission levels, they
can also be considered as one of the solutions for increasing fuel costs
and increasing effect of global warming.
From this paper I have concluded that perfect Combustion in
Internal Combustion engine is not possible. So for the instantaneous
burning of fuels in I.C. engine twin spark system can be used which
producing twin sparks at regular interval can help to complete the
combustion.