Digital Triple Spark Ignition
SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 1
1. CHAPTER
INTRODUCTION
It i...
Digital Triple Spark Ignition
SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 2
Fig 1.1 Otto Cycle.
Digital Triple Spark Ignition
SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 3
Fig 1.2 Four Stroke Engine
1...
Digital Triple Spark Ignition
SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 4
2. CHAPTER
DIGITAL TWIN SPAR...
Digital Triple Spark Ignition
SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 5
Fig 2.2 DTS-I Engine
Fig 2.3...
Digital Triple Spark Ignition
SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 6
This ignition engine has two...
Digital Triple Spark Ignition
SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 7
2.1 MAIN CHARACTERISTICS OF ...
Digital Triple Spark Ignition
SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 8
Fig 2.6 DTS – SI Engine.
2.3...
Digital Triple Spark Ignition
SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 9
Fig 2.7 DTS-FI Engine.
2.4 A...
Digital Triple Spark Ignition
SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 10
Fig 2.8 DTS-FI Engine
Moreo...
Digital Triple Spark Ignition
SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 11
2.6 LIMITATIONS OF DTS
 Co...
Digital Triple Spark Ignition
SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 12
3. CHAPTER
DIGITAL TRIPLE S...
Digital Triple Spark Ignition
SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 13
Fig 3.2 Digital triple spar...
Digital Triple Spark Ignition
SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 14
The secondary plugs fires a...
Digital Triple Spark Ignition
SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 15
3.2. HIGHEST SPARK ENERGY A...
Digital Triple Spark Ignition
SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 16
This Technology, for the fi...
Digital Triple Spark Ignition
SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 17
3.3. ADVANTAGES
 Easier st...
Digital Triple Spark Ignition
SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 18
4. CHAPTER
CONCLUSION
Hence...
Digital Triple Spark Ignition
SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 19
5. CHAPTER
REFERENCES
 Hey...
Digital Triple Spark Ignition
SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 20
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Digital Triple Spark Ignition

  1. 1. Digital Triple Spark Ignition SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 1 1. CHAPTER INTRODUCTION 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 sparks, combustion will be complete. The spark-ignition engine refers to internal combustion engines, usually petrol engines. The combustion process of the air-fuel mixture is ignited by a spark from a spark plug.The working cycle of spark-ignition may be either two-stroke or four stroke. The working of four-stroke spark-ignition engine is based on Otto cycle. And it consists of following four strokes;  Suction stroke  Compression stroke  Expansion stroke  Exhaust stroke Each of its stroke consists of 180 degree rotation of crankshaft rotation and hence a four-stroke cycle is completed through 720 degree of crank rotation. Thus for one complete cycle there is only one power stroke while the crankshaft turns by two revolutions.
  2. 2. Digital Triple Spark Ignition SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 2 Fig 1.1 Otto Cycle.
  3. 3. Digital Triple Spark Ignition SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 3 Fig 1.2 Four Stroke Engine 1.1. LIMITATIONS OF FOUR STROKE ENGINE.  Incomplete combustion.  Burning of fuel is not instantaneous.  Lower fuel efficiency.  Higher emissions.
  4. 4. Digital Triple Spark Ignition SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 4 2. CHAPTER DIGITAL TWIN SPARK IGNITION Bajaj was the first Indian manufacturer to pioneer twin spark plug engines way back in 2003. Twin spark engines apparently have a benefit over single spark engines as the “air+ fuel” mixture is burnt more efficiently. Branded as DTS-i (Digital Twin Sparkplug Ignition), it certainly made a big impact. The proof of which is that a few years later both TVS and Royal Enfield also came out with its own versions of the twin spark technology. TVS put it in its 125 cc Flame model and currently all Royal Enfield models come with twin spark plug engines. Fig 2.1 Digital Two Spark Ignition.
  5. 5. Digital Triple Spark Ignition SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 5 Fig 2.2 DTS-I Engine Fig 2.3 Bike with DTS-I engine
  6. 6. Digital Triple Spark Ignition SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 6 This ignition engine has two Spark plugs located at opposite ends of the combustion chamberand hence fast and efficient combustion is obtained. The benefits of this efficient combustion process can be felt in terms ofbetter fuel efficiency and lower emissions. The, ignition system on the Twin spark is a digital system with static sparkadvance and no moving parts subject to wear. It is mapped by the integrated digital electronic control box which alsohandles 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 offeredby two-stroke engines with a significant power boost, i.e. a considerable “power-to-weight ratio" compared to quite a fewfour- stroke engines. Fig 2.4DTS Engine.
  7. 7. Digital Triple Spark Ignition SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 7 2.1 MAIN CHARACTERISTICS OF DTS  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 2.2 DTS – SI ENGINE DTS-SI stands for “Digital Twin Spark Swirl Ignition”. DTS-SI on the other hand is an upgraded version of the present DTSI technology developed by research and development team of Bajaj and they have patented it too. Under this technology, the digital twin spark plugs are located at same place like in DTSI technology engines but in an inclined or diagonal manner. This offset of things further expounds the process of combustion and makes the ignition of fuel and air faster, resulting in enhanced power and expanded fuel efficiency. Fig 2.5 DTS-I Engine
  8. 8. Digital Triple Spark Ignition SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 8 Fig 2.6 DTS – SI Engine. 2.3 DTS – FI ENGINE DTS-FI stands for “Digital Twin Spark Fuel Injection”, a ‘Bajaj Patented Technology’. In fuel injection the conventional carburetor has been replaced by injector which injects fuel in to the engine in a spray form based on the instructions of the Engine Control Unit (ECU) which is a part of the Engine Management System EMS. The Electronic Control Unit (ECU) is microprocessor based and is the brain of the fuel injection system. It processes information sent by various sensors and instantly determines optimum fueling and spark timing for various engine operating conditions. The ECU contains detailed information of the engine’s characteristics from which it picks the necessary data for commanding both fueling & spark timing.
  9. 9. Digital Triple Spark Ignition SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 9 Fig 2.7 DTS-FI Engine. 2.4 ADVANTAGES OF FUEL INJECTION  Increased power output for same cc.  Better low end torque.  Lower fuel delivery & optimization of spark timing.  Improved cold start, quick warm-up and excellent response to sudden acceleration.  Lower emission levels.  Self-detection and communication of fuel system malfunctioning if any.
  10. 10. Digital Triple Spark Ignition SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 10 Fig 2.8 DTS-FI Engine 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. 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. 2.5 ADVANTAGES OF DTS  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.
  11. 11. Digital Triple Spark Ignition SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 11 2.6 LIMITATIONS OF DTS  Complicated design compared to single spark system  Quickly heats up the Engine during idling  Costlier than single spark ignition system
  12. 12. Digital Triple Spark Ignition SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 12 3. CHAPTER DIGITAL TRIPLE SPARK IGNITION The “Digital Triple Spark Ignition” (DTS-I) is a three spark plugs provide unprecedented performance and efficiency – Fast and optimal combustion at part load conditions results in better fuel efficiency and ensures lower emissions. The high performance triple spark engine controlled by an advanced Electronic Control Unit, is the technology of the future. Combustion in a triple spark engine is 27% faster than a twin spark and 50% faster than a single spark engine. Fig 3.1 Digital triple spark ignition.
  13. 13. Digital Triple Spark Ignition SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 13 Fig 3.2 Digital triple spark ignition engine To make use of 3 spark plugs, the pulsar engine houses a pent roof combustion chamber which in turn allows to house 3 spark plugs in the engine chamber. Out of the three plugs, the primary plug is the center one and is mounted in an angle and enters the chamber at the top-center. The other two secondary plugs are mounted below, each opposite each other and one of them being vertically underneath the primary plug.
  14. 14. Digital Triple Spark Ignition SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 14 The secondary plugs fires a bit after the primary one has fired and the timings are controlled by the ECU depending on various parameters like throttle position, engine revs,load on engine and many other stuffs. 3.1. FEATURES  Sequential firing of coils (no wasted spark)  Digital chip controlling all functions  Idle stabilization  Accurate advance curve in 50 RPM steps  Dwell control for low drain on the battery  Black box operation down to 7.5 volts  Timing fully advanced at 3800RPM  LED for static timing  Easy installation  Ignition Coil protection feature – coils are always “OFF” when the engine is stopped.
  15. 15. Digital Triple Spark Ignition SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 15 3.2. HIGHEST SPARK ENERGY AND DURATION Fig 3.3 Tri spark ignition system If the Battery voltage is reduced even slightly the results will shift dramatically in favor of the Tri-Spark system. The above charts show the spark current at the electrode. The spike height indicates the spark current. The width indicates spark duration. In each case the systems were tested with the same 12 volt supply (25 amp), test equipment and settings. Lucas ignition coils were used for the Competitor A and B test.
  16. 16. Digital Triple Spark Ignition SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 16 This Technology, for the first time in INDIA was implemented by BAJAJ on their product Pulsar 200NS. According to Bajaj, these plugs gain an advantage in low- rev riding condition where it extracts the best economy compared to KTM Duke 200 in similar conditions it gives as much as 10-13kmpl more, however the difference vanishes at higher revs and high speed. Fig 3.4 Bajaj pulsar 200NS
  17. 17. Digital Triple Spark Ignition SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 17 3.3. ADVANTAGES  Easier starting  Superior running with min vibrations and noise  Less emissions  More output power and thermal efficiency  Less prone to plug fouling  Smooth working even at higher rpms  No issues on Cold air intake  No chances of knocking 3.4. LIMITATIONS  Costlier Technology.  Complications in its design.  Fault in ECU can lead to malfunctioning of engine.  Requires high cooling (liquid cooled).  Failure in cooling can cause severe damage to engine.  Heavier engine compared to twin spark and single spark engines.
  18. 18. Digital Triple Spark Ignition SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 18 4. CHAPTER CONCLUSION Hence it can be concluded that the application of these technologies in the present day automobiles will give the 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.
  19. 19. Digital Triple Spark Ignition SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 19 5. CHAPTER REFERENCES  Heywood JB. Combustion chamber design for optimum spark-ignition engine performance. Int J Veh Des 1984;  Meyer RC, Meyers DP, King SR, Liss WE. Effects of spark plug number and location in natural gas engines. J Eng Gas Turb Power1992;  Ramtilak A, Joseph A, Sivakumar G, Bhat SS. Digital twin spark ignition for fuel economy and emissions on four stroke engines. SAE paper no. 2005-26- 008;2005.
  20. 20. Digital Triple Spark Ignition SNGIST ,North Paravur, Manjaly Dept of Mechanical Engineering 20

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