What Is DTSi Or Digital Twin-Spark Ignition And How It Works?
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.
but now a days its evolve and Bajaj using 3 spark. The main difference what it makes is in terms of mileage. Just think - a spark plug ignite fuel in the combustion chamber. It is very simple process but it becomes very complex at higher rpm. On Higher rpm single spark plug prove insufficient to burn whole fuel. So, Bajaj find solution for it and develop DTS-i technology.
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 main difference i see between DTSI Engines and other Twin spark Engines is the location of the spark plugs which results in better efficiency.
FROM WHERE-
The Twin spark or dual ignition system was incorporated on aircraft piston engines, It was mainly designed as a redundant system for an aircraft since redundancy is the prime consideration , so if one fails the other ignition system works and the Engine doesn't fail.
In other vehicles (Automobiles) combustive efficiency is the target. So this technology was incorporated.This is used in cars as well, but the convention used to name this technology is different.
Why it is preferred in 2 wheelers ?
DTSI is the digital twin spark ignition technology introduced by Bajaj. It means that instead of using one spark plug for igintion of the air fuel mixture , 2 spark plugs are used.
Because in 2 wheelers mostly one cylinder engines are used , so to increase the power output of engine , either designer have to increase the no of cylinders or increase the amount of intake air fuel mixture ( no doubt there are also other methods to increase power). But if no of cylinders are increased it leads to increase in size of the engine , which is not advisable as there are limited space in 2 wheelers. So if amount of intake charge is increased it will leads to knocking problem in engine ,if charge is not burnt completely before the start of expansion stroke (otherwise this charge will burnt later in expansion stroke). So in order to burnt the charge properly 2 spark plugs are provided in the chamber. Location of spark plug also effect the combustion process. If location is not appropriate it will decrease the flame speed. Hence effect the performance of the engine in the great extent.
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 overboost 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.
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 thereby optimizing power and fuel economy.
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
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