Transcript Digital Spark Technology

MESA-MESC Technical Session
DIGITAL SPARK
TECHNOLOGY
13/1/2014
-By Sourabh Sawant (S.E.Mech.)
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What to see?
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I C Engine Basic
Spark plug
DTS-i Technology
DTS-Si Technology
Some new technologies
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I C Engine
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I C Engines ,i.e., Internal Combustion Engines.
Main TypesSI Engines (Spark Ignition)
CI Engines (Compression Ignition)
Sub Types4 Stroke
2 Stroke
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4 Stroke SI Engines
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Combustion process in SI Engine
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Spark Occurs
Flame front moves forward
Combustion of entire mixture, layer by layer occurs
Combustion gets completed
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Factors affecting combustion
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Velocity of fresh charge
Mixture strength
Ignition timing
Position of spark plug
Presence of hot spots in combustion chamber
Proper combustion requires improvement in
these aspects
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Necessity of D S T
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For single spark plug problems are:
More ignition timing
Slow combustion rate
Comparatively low effective pressure
High knocking characteristics
To improve these facts we use the Digital
Spark Technology ……..
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•Digital Twin Spark Ignition
Digital -spark generation by a microchip
Twin - two spark plugs
Spark ignition -ignition via a spark
• Introduced in Pulsar 150 model in Year 2003
• Patent -Bajaj Motorcycles, India
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Constructional details
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The construction of DTS-i engine is same as that
of the conventional 4-Stroke engine. It consists of following
parts:
Piston
Cylinder
Crankshaft
Connecting rod
Fly wheel
Carburettor
,etc.
only change made is that the use of 2 sparkplugs
and 4 valves
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•4 Valves
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•2 Spark Plugs
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Combustion process with DTS-i
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Fresh charge is compressed during the compression
stroke
A spark will be ignited by one spark plug
Another spark will be ignited by another spark plug
as per control of the microprocessor or Digital
electronic control box (DEC)
Areas that are not covered by the first flame front
will be covered by second flame front
After power stroke, exhaust is done
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Combustion process with DTS-i
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Resulting in the complete & rapid combustion of the
fuel
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Advantages of DTS-i
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Decrease in ignition timing
Comparatively more power is produced
Less vibrations and noise
Long life of the engine parts such as piston rings
and valve stem.
Decrease in the fuel consumption
No over heating
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Advantages of DTS-i
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Increase the 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
Better work output
Less emissions
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Statistics showing adv. of DTS-i
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Disadvantages of DTS-i
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If one spark plug get damaged then we have to
replace both
The cost is relatively more
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
It does not deliver any better mileage and
acceleration than that derived from a single spark
plug.
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Bikes using DTS-i
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Some of Bajaj bikes
Discover 150 , Pulsar 135 , 150 , 180 , 200 , 220
,etc.
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2. DTS-Si technology
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Digital Twin Spark -Swirl Induction
Combination of DTS-i and Swirl induction
Introduced in XCD 125 in Year 2007
Patent – Bajaj motorcycles, India
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Constructional details
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The construction of DTS-Si engine is same as that of
the DTS-i engine.
The difference is of :
Offset port configuration
Position of 2 Spark plugs
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• DTS-i technology
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• DTS-Si technology
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Swirl Induction
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Swirl Induction is nothing but imparting a swirling
motion to the fresh charge that enters the
combustion chamber
It is done for producing higher turbulence in the
combustion chamber
This can be done by making slight modifications in
the ports positioning of engine
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Need for Swirl Induction
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Low turbulence:
give rise to propagation of a flame front, which is in
the manner of a gradually expanding balloon
slower rate of combustion
slower rate of pressure rise
lower efficiency
High turbulence:
surface of the ballooning flame front fragments itself,
with projection like fingers
increases its surface area
Improves combustion
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Improvement of combustion
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Use of an offset port configuration
this results in a swirling motion of the incoming charge,
which decays itself into turbulence as the piston moves
results in the proper mixing of Air-Fuel mixture and
spread around the combustion chamber
Sparks provided by the twin spark plugs ignite this
mixture
leading to a flame front with high surface area
resulting in a rapid rise of pressure due to rapid
combustion
resulting in high efficiency
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Advantages of DTS-Si over DTS-i
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Less Spark timing
Rapid combustion
Development of more pressure
More efficiency
Combustion efficiency in lean Air-Fuel mixture
conditions is improved
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Bikes using DTS-Si
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Some Bajaj bikes
XCD 125 , XCD 135 , Platina 125 ,etc.
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Some other vehicles with Twin spark
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Mercedes Benz MU20 (6 Cylinder engine)
Honda city (4 Cylinder engine)
TVS 125cc model
Royal Enfield
These vehicles have their own versions of the
twin spark technology.
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Some advance technologies….
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DTS-Fi
-Used in Pulsar 220
DTS-i ( Triple Spark )
-Used in new Pulsar 200NS
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Conclusion
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Application of these technologies in the present
day automobiles will give us 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. We can hope for still better
technologies, which can achieve still better results
because “there is no end for innovation”
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THANK
YOU….
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MESA-MESC Technical Session
13/1/2014