project work on dtsi-si by kc

8/13/2019 project work on dtsi-si by kc

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efore introduction of these technologies, the

motorcycle market trend is towards fuel efficient,small capacity motorbikes (usually 85cc- 110cc).Bigger motorcycles with higher capacityvirtually did not exist. The reason behind this isthe fuel consumption of these bigger or powerbikes is very high which is not at all acceptableby an average person in India. The application

of these technologies solved this problem byensuring the complete combustion of fuel in thecombustion chamber and in turn fuel efficiency.


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he central problem in the higher capacitybikes is its higher capacity (i.e. larger bore) itself.As the capacity is higher its intake of freshcharge(Air fuel mixture) will usually get increases

which in turn increases the fuel consumption.And also the complete combustion of the freshcharge that entered the combustion chamber isnot assured, because initially the capacity ishigher, therefore the flame front of the sparkignited by the spark plug has to travel theadditional distance of increased bore in order to

fire the charge at the farthest corners of thecylinder thereby slackening the combustionprocess.

There must be some modifications in the enginedesign to eliminate these problems in highercapacity bikes. The application of Digital twin

spark ignition technology can eliminate thisproblem up to maximum extent.


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he orthodox single cylinder, four-stroke, sparkignition engine is generally equipped with asingle spark plug. The fresh charge (air fuelmixture) that entered the cylinder during the

suction stroke is compressed during thecompression stroke resulting the increase ofpressure and temperature of the charge. Thespark plug, usually situated at one end of thecombustion chamber, ignites the air-fuel mixtureand the ensuing flame spreads like a slowlyinflating balloon. There is an inevitable delay

for this inflating balloon to reach the furthestpart of the combustion chamber. So, there arepockets of poor combustion within the chamberand, overall, the combustion is slow andinefficient. When it comes to higher capacityengines the distance to be traveled by the flamefront is further increased resulting the still slower

combustion.


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he Digital Twin Spark Ignition technologytakes care of this slower combustion problem ina simple but a novel way. The cylinder head isequipped with two spark plugs, instead of theusual one. By generating two sparks at eitherends of the combustion chamber,(approximately 90 to the valve axis) the air-fuel mixture gets ignited in a way that creates

two flame fronts and, therefore, a reduction inflame travel of the order of 40 per cent isachieved. A fast rate of combustion is achievedleading to faster rise in pressure. The obviousoutcome of this is more torque, better fuelefficiency and lower emissions. An electronicdevice (microprocessor) controls the firing order

of these twin spark plugs.Fig showing both conventional engine and aDTS-I engine


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COMBUSTION PROCESS WITH DTS ITECHNOLOGY

he fresh charge that entered the cylinderduring the suction stroke is compressed during

the compression stroke. Then a spark will beignited by one of the twin spark plugs and theflame front begins to expand like an inflatingballoon. In the mean while another spark willbe ignited by another spark plug as per controlsof the microprocessor. The flame front also beginsto expand like an inflating balloon. Therefore

the areas that are not covered by the first flamefront will be covered by second flame frontresulting in the complete & rapid combustion ofthe fuel. However, this technology even thoughproved as a successful one all bikemanufacturing companies are not incorporatingthis technology in their models. Their idea is this

faster rate of combustion can be achieved byemploying a single spark plug with differentialsparking cycles.


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he construction of Dts-i engine is same as that of

the conventional 4-Stroke engine.It consist of following parts Piston

Cylinder

Crankshaft

Connecting rod

Fly wheel

Carburetor

2-sparkplug

2-ports

2-valvs
http://2.bp.blogspot.com/-EuoNsHd17qk/T3CSkGjprGI/AAAAAAAAADY/v9aiTgh80qo/s1600/confugration.jpg


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Here the only change made is that the 2 sparkplugplaced at the two opposite end of the combustion

chamber At 90 degree to each other.

Detonation in DTS i engine....

n petrol engine major problem is

DETONATION. Detonation occurs when the flametravel time from center to the side walls increases theself-ignition temperature time. It happens often in theengines having single spark plug.

This is overcome by the DTS-i by having 2 sparksources on the opposite sides which reduces the flametravel as stated above. Hence no detonation.


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he working of DTS-i engine is very similar to 4-

stroke engine but here the only modification done iswe are using two spark plug at two ends of thecombustion chamber. Which require less time to reachthe farthest position of the combustion chamber andoptimize the combustion chamber characteristics.There are some advance technology used in DTS-iengine which makes it more powerful than theconventional single sparkplug 4-stroke engine

like 1.CDI technology 2.Tricks iii technology .Ignition with a Digital C.D.I.

A Digital CDI with an 8 bit microprocessorchip handles the spark delivery. The programmedchips memory contains an optimum Ignition timingfor any given engine rpm, thereby obtaining the bestperformance characteristics from the combustionchamber. Working together with the TRICSIII system,it delivers Optimum Ignition Timing for varying loadconditions.


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.

hrottle Responsive Ignition Control System

IIIrd generation. It is a means of controlling theIgnition by operating the Throttle. Depending on theneeds of the Rider whether it be cruising, accelerationor max speed, the ignition requirements constantlychange. Based on a particular amount of Throttleopening, the Magnetic field generated by the Magnetopens or closes the Reed switch. The Reed switch isconnected to the Digital CDI, which signals the CDI tochange/switch, the desired Ignition Advance TimingMaps. This helps in achieving a good balance betweendriveability and Optimum Ignition Spark advance,

resulting in an almost perfect Ignition Spark advancefor every Throttle opening and Engine rpm.


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rom this I conclude that perfect Combustion

in Internal Combustion engine is

not possible. So for the instantaneous burning of fuelsin I.C. engine twin spark system can beused which produces twin sparks at regular intervalsand can help to complete the combustion.


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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

Gradual increase in the pressure hence power is

uniformly distributed throughout the crank angle and

hence smooth ride.


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There is high NOxemission

If one spark plug gets damaged then we have toreplace both

The cost is relatively more

You spend double the amount on spark plugswhen it is time to replace them.

The engine tends to overheat and loose power at

higher speeds as compared to a single plug engine.

The engine wear and tear is somehow increased andhence these engines need frequent checkup andoverhaul to keep the performance level constant.

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project work on dtsi-si by kc