It was very interesting to know about complete combustion in automobile engineering , because in actual practice, perfect combustion was not at all possible due to various losses in the combustion chamber as well as design of the internal combustion engine. More over the process of burning of the fuel was also not instantaneous. However an alternate solution to it was 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 was called DTSI (Digital Twin Spark Ignition system). In that system, due to twin sparks, combustion will be complete...
Working Procedure
Digital Twin Spark ignition engine had two Spark plugs located at opposite ends of the combustion chamber and hence fast and efficient combustion was obtained. The ignition system on the Twin spark was a digital system with static spark advance and no moving parts subject to wear. The benefits of this efficient combustion process could be felt in terms of better fuel efficiency and lower emissions. It was mapped by the integrated digital electronic control box which also handles fuel injection and valve timing. It features two plugs per cylinder.
it also prevents the upper rev limit from being exceeded. At low revs, the over boost was mostly used when overtaking, and this was why it cuts out automatically. At higher speeds the over boost would enhance full power delivery and would stay on as long as the driver exercises maximum pressure on the accelerator.
Moreover, such a system could adjust idling speed & even cuts off fuel feed when the accelerator pedal was released, and meters the enrichment of the air-fuel mixture for cold starting and accelerating purposes; if necessary,
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 was 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 significouldt power boost, i.e. a considerable "power-toweight ratio" compared to quite a few four-stroke engines
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 was currently used in Bajaj motor cycles in India, because they have the patent right. Digital twin spark ignition technology powered engine had two spark plugs. It was located at opposite sides of combustion chamber. This DTS-I technology would 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 was mapped by the digital electronic control box which also handles fuel ignition and valve timing. A microprocessor continuously senses speed and loads 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 was high NOx emission
• If one spark plug get damaged then we have to replace both
• The cost was relatively more
Applications
It uses in automotive engines. In India Bajaj had 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.
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