What Is DTS-



Well, the DTS-Si or the?Digital Twin Spark-Swirl?Induction?is a technology where dual spark plugs are used and that it is known to give great mileage to the bikes and this is main purpose why the major bike manufacturers use the technology in their bikes. The DTS-Si technology will likely give unbelievable fuel efficiency provided the bike runs in standard test conditions.Generally, the 100cc motorbikes do not offer such a mileage but the?DTS-Si technology?powered bikes give a greater mileage, which is the biggest advantage for the bikes. As the technology uses 2 spark plugs to initiate the combustion of air-fuel mixture, it leaves little unburnt fuel within the engine.Why is the?DTS-Si technology?better than the conventional single spark plug equipped engine?Apart from giving an amazing mileage to the bike, the engine enabled with?DTS-Si technology?does not compromise on technology. In a traditional single spark plug oriented the combustion process is very slow. This is because the spark plug is located at one end of the combustion chamber, which sparks the air-fuel mixture and the flame inflates like a balloon that takes some time to reach the remote corner of the combustion chamber that delays the combustion process. Whereas, in the DTS-Si technology equipped engine the cylinder head is fitted with two spark plugs at two of corners of the combustion chamber, which ensures that the sparks emit from two ends of the chamber and the air fuel mixture ignites to produce two flame fronts thus, the process of combustion is faster and also the pressure rises at a good pace. This technology in the engine promotes greater torque, fuel-efficiency and low emission.What do the motorcycle makers have to say on the?DTS-Si?Hero Honda and Bajaj have had two different opinions regarding the performance of 100cc bikes performance in the market. Bajaj was of the belief that the demand for 100cc bikes was fast declining and with time the segment will not have many buyers. And Bajaj quickly testified their belief with the R&D team came up with the?DTS-Si technology?that ensured fast rate combustion and pressure rise. But TVS Motors claimed that the same could be achieved in a single spark too by inserting differential sparking cycles. There are other engine makers besides TVS who do argue that a good combustion chamber design will not have poor combustion issues, and that should a?DTSSi technology?improve fuel efficiency, then the combustion chamber design must be bad.This could be individual opinions but we are seeing the Bajaj bikes; the 150cc and the 220cc ones featuring the?DTS-Si technology?for good. They have patents for these bikes in various countries. And it cannot be debated that Bajaj bikes with the technology sell like hell; a great marketing tactic and definitely an add on the consumers benefited.Conventional 4 stroke Engine-intake/induction strokecompression strokepower strokeexhaust strokeThe cycle begins when the piston is furthest away from the crankshaft. On the first stroke (intake/induction) of the piston, as the piston descends it reduces the pressure in the cylinder, a mixture of fuel and air is forced, by at least atmospheric pressure, into the cylinder through the intake port. The intake valve then closes and the following stroke (compression) compresses the fuel-air mixture.The air-fuel mixture is then ignited, by a spark plug, at approximately the top of the compression stroke. The resulting expansion of burning gases pushes the piston downward for the third stroke (power) and in the fourth stroke (exhaust) the piston pushes the products of combustion from the cylinder through an exhaust valve or valves.DTS-i Engine?-DTS-i?stands for?“Digital Twin Spark Ignition”, a ‘Bajaj Patented 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 benefits of this efficient combustion process can be felt in terms of better fuel efficiency and lower emissions.DTS-i Engine?can be further tuned to deliver exhilarating performance as in?DTS-FI?or exceptional mileage like in?DTS-SI?as claimed by Bajaj. The use of twin spark plugs has been around for decades mostly in the engine of Alfa Romeo, Honda and on large capacity Ducati engine etc. Bajaj however have patented the technology for small capacity engines.DTS-Si Engine?-DTS-Si?stands for?“Digital Twin Spark Swirl?Induction”, a ‘Bajaj Patented Technology’.?Like DTS-i the engine has 2 spark plugs, but, instead of conventionally positioned straight ports, the offset positioning of the ports generate high swirl and turbulence of the air fuel mixture in the combustion chamber. This results in highly efficient combustion that further results in exceptional mileage. Like the mother DTS-i technology, the DTS-Si technology is a patented technology developed by Bajaj Auto R&D. This technology is used by Bajaj in its recently launched?125 cc Bajaj XCD.Recently, Bajaj Auto was in the news for accusing TVS Motors, long-standing rivals of patent infringement on the DTS-i technology. TVS countered by threatening to sue Bajaj Auto for libel.DTS-Fi Engine-DTS-Fi?stands for?“Digital Twin Spark Fuel Injection”, a ‘Bajaj Patented Technology’. In fuel injection the conventional carburettor 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 fuelling 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 fuelling & spark timing.This technology comes in?Pulsar 220cc?version.The main advantages of Fuel Injection are:a. Increased power output for same cc.b. Better low end torque. c. Lower fuel delivery & optimisation of spark timing.d. Improved cold start, quick warm-up and excellent response to sudden acceleration.e. Lower emission levels.f. Self-detection and communication of fuel system malfunctioning if any.DTS-i Triple Spark Engine-Here?DTS-i?Stands for?“Digital Triple Spark Ignition”.?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.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.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. According to Bajaj, these plugs gain a advantage in low-rev riding condition where it extracts the best pared to KTM Duke 200 in similar conditions it gives as much as 10-13kmpl more,however the difference vanishes at higher revs and high speedDTS-iWhat Is DTS-i......? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Cut section view of a DTS-i engineDTSi stands for Digital Twin?Spark Ignition.?Bajaj developed a few years ago and has incorporated in many of its current engines, takes care of the slow rate of combustion in a simple but novel way. The cylinder head is equipped with two spark plugs, instead of the usual one. By generating two sparks at either ends 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 in flame travel of the order of 40 per cent is achieved. A fast rate of combustion is achieved leading to faster rise in pressure. The obvious outcome of this is more torque, better fuel efficiency and lower emissions.History:-?DTSi stands for Digital Twin?Spark Ignition, a Bajaj Auto trademark. Bajaj Auto holds an Indian patent for the DTSi technology. The Alfa Romeo Twin-Spark engines, the?BMW F650 Funduro?which was sold in India from 1995 to 1997 also had a twin-spark plug technology, and the Rotax motorcycle engines,more recently Honda's iDSI Vehicle engines use a similar arrangement of two spark-plugs. However very few small capacity engines did eventually implement such a scheme in their production prototypes.?Introduction:-?Currently one spark plug at one end of the combustion chamber is the conventional practice. The flame front created by the spark takes some time to reach the farthest portion of the combustion chamber. This leads to slower burning of the Air-fuel mixture and creates limitations in optimizing the combustion chamber characteristics.???????????????????????i.e. Slower combustion rate????? Higher exhaust emission????? Comparatively low mean effective pressure????? High Knocking characteristics etc.2 spark plugs at either ends of the combustion chamber help in faster and better combustion.In this technology you will find two spark plugs to ignite the charge in the combustion chamber. Its only in the petrol engine so far and this technology can find a way in disel engine also.What does the Digital ,Twin ,Spark Ignition means???Digital?- Since the spark generation will be initiated by a microchip.???Twin?-?Since two spark plugs will be used.???Spark ignition?- Since the ignition will be done via a spark.??????????????? ???Constructional Detail:-? ? ? ??The construction of Dts-i engine is same as that of the conventional? 4-Stroke engine. ???????????????? ?????????? ? ? ? ?It consist of following parts??PistonCylinder? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ??CrankshaftConnecting rod?Fly wheel?Carburator?2-sparkplug??2-ports??2-valvsHere the only change made is that the 2 sparkplug placed at the two opposite end of the combustion chamber At 90 degree to each othor.?????????????????????? ? ??Detonation in DTS-i engine....????????? In petrol engine major roblem is DETONATION. detonation accurs when the flame travell time from center to the side walls increases the self ignition temp. time. It happens often in the engines having single spark plug.This is overcome by the DTSi by having 2 spark source on the opposite sides which reduces the flame travel as stated above. Hence no detonation..????The technology:-In a conventional single-spark-plug-equipped combustion chamber, and the rate of combustion is relatively slow. The spark plug, usually situated at one end of the combustion chamber, ignites the air-fuel mixture and the ensuing flame spreads like a slowly inflating balloon. There is an inevitable delay for this inflating balloon to reach the furthest part of the combustion chamber. So, there are pockets of poor combustion within the chamber and, overall, the combustion is slow and inefficient.The Digital Twin Spark–ignition (DTS-i) technology that Bajaj developed a few years ago and has incorporated in many of its current engines, takes care of the slow rate of combustion in a simple but novel way. The cylinder head is equipped with two spark plugs, instead of the usual one. By generating two sparks at either ends 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 in flame travel of the order of 40 per cent is achieved. A fast rate of combustion is achieved leading to faster rise in pressure. The obvious outcome of this is more torque, better fuel efficiency and lower emissions.While that sounds logical and simplistic, TVS Motor claims that the same effect is achieved by employing a single spark plug with differential sparking cycles.? ?Working:-The working of DTS-i engine is very similar to 4-stroke engine but here the only modification done is we are using two spark plug at two ends of the combustion chamber. Which require less time to reach the farthest position of the combustion chamber??and optimize the combustion chamber characteristics.There are some advance technology used in DTS-i engine which makes it more powerful than the conventional 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 microprocessor chip handles the spark delivery. The programmed chip’s memory contains an optimum Ignition timing for any given engine rpm, thereby obtaining the best performance characteristics from the combustion chamber. Working together with the TRICSIII system, it delivers Optimum Ignition Timing for varying load conditions.?TRICS III.? ? ? ? ? ?Throttle Responsive Ignition Control System IIIrd generation. It is a means of controlling the Ignition by operating the Throttle. Depending on the needs of the Rider whether it be cruising, acceleration or max speed, the ignition requirements constantly change. Based on a particular amount of Throttle opening, the Magnetic field generated by the Magnet opens or closes the Reed switch. The Reed switch is connected to the Digital CDI, which signals the CDI to change/switch, the desired Ignition Advance Timing Maps. This helps in achieving a good balance between driveability and Optimum Ignition Spark advance, resulting in an almost perfect Ignition Spark advance for every Throttle opening and Engine rpm.??Advantage:-Less vibrations and noise?Long life of the engine parts such as piston rings and valve stem.Decrease in the specific fuel consumptionNo over heating??Gradual increase in the pressure hence power is uniformly distributed throughout the crank angle and hence smooth ride.Disadvantage:-There is high NOx?emission?If one spark plug get damaged then we have to replace bothThe cost is relatively moreYou spend double the amount on spark plugs when 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 and hence these engines need frequent checkup and overhaul to keep the performance level constant.??? ................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download