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Digital Spark Technology. -By Sourabh Sawant (S.E.Mech.). What to see?. I C Engine Basic Spark plug DTS-i Technology DTS-Si Technology Some new technologies. I C Engine. I C Engines ,i.e., Internal Combustion Engines. Main Types- SI Engines (Spark Ignition)

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Digital spark technology

MESA-MESC Technical Session

Digital Spark Technology

-By Sourabh Sawant (S.E.Mech.)

What to see
What to see?

  • I C Engine Basic

  • Spark plug

  • DTS-i Technology

  • DTS-Si Technology

  • Some new technologies

MESA-MESC Technical Session

I c engine
I C Engine

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

  • Main Types-

  • SI Engines (Spark Ignition)

  • CI Engines (Compression Ignition)

  • Sub Types-

  • 4 Stroke

  • 2 Stroke

MESA-MESC Technical Session

4 stroke si engines
4 Stroke SI Engines

MESA-MESC Technical Session

Combustion process in si engine
Combustion process in SI Engine

  • Spark Occurs

  • Flame front moves forward

  • Combustion of entire mixture, layer by layer occurs

  • Combustion gets completed

MESA-MESC Technical Session

Factors affecting combustion
Factors affecting combustion

  • 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
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 ……..

MESA-MESC Technical Session


  • 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

MESA-MESC Technical Session

Constructional details
Constructional details

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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  • 2 Spark Plugs

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Combustion process with dts i
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 i1
Combustion process with DTS-i

  • Resulting in the complete & rapid combustion of the fuel

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Advantages of dts i
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

MESA-MESC Technical Session

Advantages of dts i1
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
Statistics showing adv. of DTS-i

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Disadvantages of dts i
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
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
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

MESA-MESC Technical Session

Constructional details1
Constructional details

  • 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-Si technology

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Swirl induction
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

MESA-MESC Technical Session

Need for swirl induction
Need for Swirl Induction

  • 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
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
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
Bikes using DTS-Si

  • Some Bajaj bikes

  • XCD 125 , XCD 135 , Platina 125 ,etc.

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Some other vehicles with twin spark
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
Some advance technologies….

  • DTS-Fi

    -Used in Pulsar 220

  • DTS-i ( Triple Spark )

    -Used in new Pulsar 200NS

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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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MESA-MESC Technical Session