Monday, 9 September 2013

DTSI (Digital Twin Spark Ignition System)


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 Twin 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.


How Does It Works?


Digital Twin Spark ignition engine has two Spark plugs located at opposite ends of the combustion chamber and hence fast and efficient combustion is obtained. The benefits of this efficient combustion process can be felt in terms of better fuel efficiency and lower emissions. The ignition system on the Twin spark is a digital system with static spark advance and no moving parts subject to wear. It is mapped by the integrated digital electronic control box which also handles fuel injection and valve timing. It features two plugs per cylinder.


This innovative solution, also entailing a special configuration of the hemispherical combustion chambers and piston heads, ensures a fast, wide flame front when the air-fuel mixture is ignited, and therefore less ignition advance, enabling, moreover, relatively lean mixtures to be used. This technology provides a combination of the light weight and twice the power offered by two-stroke engines with a significant power boost, i.e. a considerable "power-to-weight ratio" compared to quite a few four-stroke engines.

Moreover, such a system can adjust idling speed & even cuts off fuel feed when the accelerator pedal is released, and meters the enrichment of the air-fuel mixture for cold starting and accelerating purposes; if necessary, it also prevents the upper rev limit from being exceeded. At low revs, the over boost is mostly used when overtaking, and this is why it cuts out automatically. At higher speeds the over boost will enhance full power delivery and will stay on as long as the driver exercises maximum pressure on the accelerator.

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.


Construction


Digital spark technology is currently used in Bajaj motor cycles in India, because they have the patent right. Digital twin spark ignition technology powered engine has two spark plugs. It is located at opposite sides of combustion chamber. This DTS-I technology will have greater combustion rate because of twin spark plug located around it. The engine combust fuel at double rate than normal. This enhances both engine life and fuel efficiency. It is mapped by the digital electronic control box which also handles fuel ignition and valve timing.

A microprocessor continuously senses speed and load of the engine and respond by altering the ignition timing there by optimizing power and fuel economy.


Advantages & Disadvantages


Advantages

• 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.

Disadvantages

• There is high NOx emission

• If one spark plug get damaged then we have to replace both

• The cost is relatively more


Applications


It uses in automotive engines. In India Bajaj has patented for dts-i technology. At present platina, xcd125, 135, discover150, pulsar135, 150, 180, 200, 220 etc. are using the dts-i(digital twin spark ignition system). Which means the petrol enters into the cylinder burns more efficiently.

Hence 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.

The 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.

50 comments:

  1. Replies
    1. That can be cured through catalytic converters used in exhaust system of vehicle.

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  2. Replies
    1. why we have to replace both the spark plugs if one of these get damaged?

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    2. May be due to series connection of two spark-plugs to produce high voltage... i m not sure

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  3. NOx is a generic term for the mono-nitrogen oxides NO and NO2 (nitric oxide and nitrogen dioxide). They are produced from the reaction of nitrogen and oxygen gases in the air during combustion, especially at high temperatures. In areas of high motor vehicle traffic, such as in large cities, the amount of nitrogen oxides emitted into the atmosphere as air pollution can be significant. NOx gases are formed whenever combustion occurs in the presence of nitrogen – as in an air-breathing engine; they also are produced naturally by lightning. In atmospheric chemistry, the term means the total concentration of NO and NO2. NOx gases react to form smog and acid rain as well as being central to the formation of tropospheric ozone.

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  4. Sir
    Twins park vs efi electronic fuel ignition which is the best

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    Replies
    1. Twin spark is best for Two wheeler and electronic fuel injection is mostly used in four wheeler.

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  5. how we get advantage of " no over heating " in dtsi

    ReplyDelete
  6. Easy to empty pocket then petrol waste will less. Also one gone nother will in twice in High Voltage and blast your pocket.........

    ReplyDelete
  7. Easy to empty pocket then petrol waste will less. Also one gone nother will in twice in High Voltage and blast your pocket.........

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  12. It is clearly known that "DTSi" means Digital Twin Spark ignition but what does "DTS-Si" which appears in the article mean and is there any difference between these two?

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    Replies
    1. Technically both are same. Difference in name may be due to patent problem.

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    2. Digital twin spark- swirl injection. Here swirl injection refers to the movement of air inside the cylinder.

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  13. what is the reason of changing both spark plug when only one is damaged?

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    Replies
    1. It may affect engine performance.

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  18. How can I know that my one plug is damaged..????

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  19. How can I know that my one plug is damaged..????

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  20. How can I know that one plug in my bike is not not working or damaged...????

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  21. Right form the start do both the spark plugs work?
    Or its like till some initial rpm only one works and them later above some rpm both start working..
    Plz help me out.

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  22. Thanks to be sharing the information of DTSI (Digital Twin Sparking Ignition System). It's been good to see your blog when I always look for such type of blogs.

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  23. whether the bikes with dts-si engine currently uses a catalyst to control the Nox emission and currently which Bharat stage does these bikes come under.

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  24. Thanks for sharing. It really helped.

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  25. Patent? This has been in use since before WWII.

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  28. very good it covers all important data in short

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  30. Nice Inforamtion to share with anyone person

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  31. what 'bout the spark timings? is it together? can it we made alternate with slight as in microseconds gap between two sparks ?

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  35. Thanks for the technical and brief detail about DTSI, true Bajaj has the patent right for the digital spark ignition system. Such a helpful information, thanks for the sharing.

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