| Digital Twin Spark Ignition |
Definition
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 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.
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. Fig.1. show the actual
picture of Bajaj Pulsar Bike.
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 revving 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
superior balance
This power unit, equipping the naturally aspirated 2-litre used on the Alfa 164, is a direc
Ldeflvative of the engine fitted on the 2.0 Twin Spark version of the Alfa 75, a recent
addition to the Alfa car range. It includes a number of exclusive engineering solutions
resulting in superior power output and exceptional peak torque for this cylinder capacity. Its
main characteristics are:
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.
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