1. Digital Spark Technology
MESA-MESC Technical Session
Digital Spark Technology
13/1/2014
-By Sourabh Sawant (S.E.Mech.)

2. What to see? I C Engine Basic Spark plug DTS-i Technology
DTS-Si Technology
Some new technologies
MESA-MESC Technical Session
13/1/2014

3. I C Engine I C Engines ,i.e., Internal Combustion Engines. Main Types-
SI Engines (Spark Ignition)
CI Engines (Compression Ignition)
Sub Types-
4 Stroke
2 Stroke
MESA-MESC Technical Session
13/1/2014

4. 4 Stroke SI Engines
MESA-MESC Technical Session
13/1/2014

5. Combustion process in SI Engine
Spark Occurs
Flame front moves forward
Combustion of entire mixture, layer by layer occurs
Combustion gets completed
MESA-MESC Technical Session
13/1/2014

6. Factors affecting combustion
Velocity of fresh charge
Mixture strength
Ignition timing
Position of spark plug
Presence of hot spots in combustion chamber
Proper combustion requires improvement in these aspects
MESA-MESC Technical Session
13/1/2014

7. Necessity of D S T For single spark plug problems are:
More ignition timing
Slow combustion rate
Comparatively low effective pressure
High knocking characteristics
To improve these facts we use the Digital Spark Technology ……..
MESA-MESC Technical Session
13/1/2014

8. 1. Digital Twin Spark Ignition
 Digital -spark generation by a microchip
  Twin - two spark plugs
Spark ignition -ignition via a spark
 Introduced in Pulsar 150 model in Year 2003
Patent -Bajaj Motorcycles, India
MESA-MESC Technical Session
13/1/2014

9. Constructional details
The construction of DTS-i engine is same as that of the conventional 4-Stroke engine. It consists of following parts:
Piston
Cylinder
Crankshaft
Connecting rod
Fly wheel
Carburettor ,etc.
only change made is that the use of 2 sparkplugs and 4 valves
MESA-MESC Technical Session
13/1/2014

10. 4 Valves
2 Spark Plugs
MESA-MESC Technical Session
13/1/2014

11. Combustion process with DTS-i
Fresh charge is compressed during the compression stroke
A spark will be ignited by one spark plug
Another spark will be ignited by another spark plug as per control of the microprocessor or Digital electronic control box (DEC)
Areas that are not covered by the first flame front will be covered by second flame front
After power stroke, exhaust is done
MESA-MESC Technical Session
13/1/2014

12. Combustion process with DTS-i
Resulting in the complete & rapid combustion of the fuel
MESA-MESC Technical Session
13/1/2014

13. Advantages of DTS-i Decrease in ignition timing
Comparatively more power is produced
Less vibrations and noise
Long life of the engine parts such as piston rings and valve stem.
Decrease in the fuel consumption
No over heating
MESA-MESC Technical Session
13/1/2014

14. Advantages of DTS-i
Increase the 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
Better work output
Less emissions
MESA-MESC Technical Session
13/1/2014

15. Statistics showing adv. of DTS-i
MESA-MESC Technical Session
13/1/2014

16. Disadvantages of DTS-i
If one spark plug get damaged then we have to replace both
The cost is relatively more
The engine tends to overheat and loose power at higher speeds as compared to a single plug engine
In case the Engine is kept unused for a long time, soiling of spark plugs occur
It does not deliver any better mileage and acceleration than that derived from a single spark plug.
MESA-MESC Technical Session
13/1/2014

17. Bikes using DTS-i Some of Bajaj bikes
Discover 150 , Pulsar 135 , 150 , 180 , 200 , 220 ,etc.
MESA-MESC Technical Session
13/1/2014

18. 2. DTS-Si technology Digital Twin Spark -Swirl Induction
Combination of DTS-i and Swirl induction
Introduced in XCD 125 in Year 2007
Patent – Bajaj motorcycles, India
MESA-MESC Technical Session
13/1/2014

19. Constructional details
The construction of DTS-Si engine is same as that of the DTS-i engine.
The difference is of :
Offset port configuration
Position of 2 Spark plugs
MESA-MESC Technical Session
13/1/2014

20. DTS-i technology DTS-Si technology MESA-MESC Technical Session
13/1/2014

21. Swirl Induction
Swirl Induction is nothing but imparting a swirling motion to the fresh charge that enters the combustion chamber
It is done for producing higher turbulence in the combustion chamber
This can be done by making slight modifications in the ports positioning of engine
MESA-MESC Technical Session
13/1/2014

22. Need for Swirl Induction
Low turbulence:
give rise to propagation of a flame front, which is in the manner of a gradually expanding balloon
slower rate of combustion
slower rate of pressure rise
lower efficiency
High turbulence:
surface of the ballooning flame front fragments itself, with projection like fingers
increases its surface area
Improves combustion
MESA-MESC Technical Session
13/1/2014

23. Improvement of combustion
Use of an offset port configuration
this results in a swirling motion of the incoming charge, which decays itself into turbulence as the piston moves
results in the proper mixing of Air-Fuel mixture and spread around the combustion chamber
Sparks provided by the twin spark plugs ignite this mixture
leading to a flame front with high surface area
resulting in a rapid rise of pressure due to rapid combustion
resulting in high efficiency
MESA-MESC Technical Session
13/1/2014

24. Advantages of DTS-Si over DTS-i
Less Spark timing
Rapid combustion
Development of more pressure
More efficiency
Combustion efficiency in lean Air-Fuel mixture conditions is improved
MESA-MESC Technical Session
13/1/2014

25. Bikes using DTS-Si Some Bajaj bikes
XCD 125 , XCD 135 , Platina 125 ,etc.
MESA-MESC Technical Session
13/1/2014

26. Some other vehicles with Twin spark
Mercedes Benz MU20 (6 Cylinder engine)
Honda city (4 Cylinder engine)
TVS 125cc model
Royal Enfield
These vehicles have their own versions of the twin spark technology.
MESA-MESC Technical Session
13/1/2014

27. Some advance technologies….
DTS-Fi
-Used in Pulsar 220
DTS-i ( Triple Spark )
-Used in new Pulsar 200NS
MESA-MESC Technical Session
13/1/2014

28. Conclusion
Application of these technologies in the present day automobiles will give us 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. We can hope for still better technologies, which can achieve still better results because “there is no end for innovation”
MESA-MESC Technical Session
13/1/2014

29. THANK YOU….
MESA-MESC Technical Session
13/1/2014