DIGITAL SPARK TECHNOLOGY -By Sourabh Sawant (S.E.Mech.) 13/1/2014 1 MESA-MESC Technical Session

MESA-MESC Technical Session 1

DIGITAL SPARK TECHNOLOGY

-By Sourabh Sawant (S.E.Mech.) 13/1/2014

MESA-MESC Technical Session

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What to see?

1. I C Engine Basic2. Spark plug3. DTS-i Technology4. DTS-Si Technology5. Some new technologies

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I C Engine

I C Engines ,i.e., Internal Combustion Engines.

Main Types-1. SI Engines (Spark Ignition)2. CI Engines (Compression Ignition) Sub Types-1. 4 Stroke2. 2 Stroke

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4 Stroke SI Engines

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Combustion process in SI Engine1. Spark Occurs2. Flame front moves forward3. Combustion of entire mixture, layer by

layer occurs4. Combustion gets completed

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Factors affecting combustion

1. Velocity of fresh charge2. Mixture strength3. Ignition timing4. Position of spark plug5. Presence of hot spots in combustion

chamber Proper combustion requires

improvement in these aspects13/1/2014


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Necessity of D S T

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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MESA-MESC Technical Session8

•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

The construction of DTS-i engine is same as that of the conventional 4-Stroke engine. It consists of following parts:

1. Piston 2. Cylinder 3. Crankshaft 4. Connecting rod 5. Fly wheel 6. Carburettor ,etc.

only change made is that the use of 2 sparkplugs and 4 valves

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•4 Valves

•2 Spark Plugs13/1/2014


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Combustion process with DTS-i 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 Resulting in the complete & rapid

combustion of the fuel

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Advantages of DTS-i

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

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

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

Some of Bajaj bikes Discover 150 , Pulsar 135 , 150 , 180 ,

200 , 220 ,etc.

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2. DTS-Si technology

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

The construction of DTS-Si engine is same as that of the DTS-i engine.

The difference is of :1. Offset port configuration2. Position of 2 Spark plugs

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• DTS-i technology

• DTS-Si technology

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Swirl Induction

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

Low turbulence:1. give rise to propagation of a flame front, which is

in the manner of a gradually expanding balloon2. slower rate of combustion3. slower rate of pressure rise4. lower efficiency High turbulence: 1. surface of the ballooning flame front fragments

itself, with projection like fingers2. increases its surface area3. Improves combustion

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Improvement of combustion

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 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

Some Bajaj bikes XCD 125 , XCD 135 , Platina 125 ,etc.

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Some other vehicles with Twin spark 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…. DTS-Fi -Used in Pulsar 220 DTS-i ( Triple Spark ) -Used in new Pulsar 200NS

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Conclusion

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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Documents

DIGITAL SPARK TECHNOLOGY -By Sourabh Sawant (S.E.Mech.) 13/1/2014 1 MESA-MESC Technical Session