Seminar on :- Digital Twin Spark Ignition(DTSI) “A new revolution of Twin Spark in I.C. Engine”

Introduction A conventional 4 Stroke engine has a Single Spark Plug and leads to inefficient combustion. Required Basic design for : i)Uniform power delivery in all operating conditions. ii)A high degree of drivability. iii)Long service life.

So , What is DTSI ?? Two spark plugs at opposite ends of combustion chamber. Hemispherical chambers, piston heads. Helps in better fuel efficiency and lower emissions. Fast and efficient combustion is obtained.

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 with superior balance.

Engine comprises of…….??? Four-in-line cylinder Light weight due to all Aluminum - alloy engine block Eight counterweights ensure optimal balancing of the high strength nitride steel crankshaft The pressed-in cast iron cylinder liners for more effective heat dissipation

Valve Drive Valves directly acts in V- configuration (46o). Valve timing Actuator operates exhaust and intake valves. At high and medium-high engine speeds, cylinder filling is optimal. At low and medium-low engine speeds, fluctuation-free operation is ensured with reduction in specific fuel consumption.

Fuel Injection Fuel injection is used to ensure excellent fuel efficiency as well as environmental friendliness. The fuel supply component consists of fuel pump, modularized regulator and filter& a small injector. The injector injects finely atomized spray of fuel through 6 hole type injectors.

Ignition It is controlled by integrated digital electronic control box called Capacitor Distributed Ignition(CDI). DTSI yields: 1. More effective combustion at low load and at idling speed. 2. A sizeable reduction in specific fuel consumption. 3. Less chance of ignition system failure.

Maiden DTSI Engine Displacement - Four-valve DTSi . First 4-wheeler to use DTS-i. It is a Superior model of Nano. The model is Bajaj RE6O. Engine Displacement - Four-valve DTSi . Engine Model - DTSi. Engine Type - Petrol.

Bajaj Pulsar 220 DTSI review :

Bajaj Pulsar 220 DTSI review: The Pulsar 220 DTS-I bike have a India’s largest carburettor, temperature based ignition mapping and  Auto choke. To give high end speed and mileage with air-mixed fuel to prove her power and Good start ability & better torque.

Bajaj Pulsar 220 DTSI review: Spark Plug used in Pulsar 220 DTS-i. Comparison of Spark Plug temperature with the vehicle velocity.

Bajaj Pulsar 220 DTSI review: Fig: Starting of Pulsar DTS-i Bike.

Mathematical Model Governing equations of the cycle model: The energy equation in crank angle basis is written as: ∆𝑼=𝑸−𝑾=𝒎 𝒅𝒖 𝒅𝜽 +𝒖 𝒅𝒎 𝒅𝜽 = 𝒅𝑸 𝒅𝜽 −𝒑 𝒅𝑽 𝒅𝜽 To determine instantaneous cylinder volume, pressure ,and burned and unburned gas temperatures, the following governing equations have been used: 𝐕 𝛉 = 𝐕 𝐜 {𝟏+ 𝐫−𝟏 𝟐 [𝟏 −𝐜𝐨𝐬𝛉+𝟏/ 𝐫 𝐜𝐫 [𝟏−(𝟏− 𝐫 𝐜𝐫 𝟐 𝐬𝐢𝐧 𝟐 𝛉 ) 𝟎.𝟓 ]]}

Mathematical Model Combustion model: Equations to determine the burnt mass fraction : 𝒅 𝒎 𝒆 𝒅𝜽 = 𝝆 𝒖 𝑨 𝒇 𝑼 𝒆 𝒅 𝒎 𝒃 𝒅𝜽 = 𝝆 𝒖 𝑨 𝒇 𝑺 𝑳 + 𝒎 𝒆 − 𝒎 𝒃 𝝉 𝒃 𝝉 𝒃= 𝒍 𝑻 𝑺 𝑳 Where, 𝑨 𝒇 = area of flame front 𝝉 𝒃 = the characteristics burning time 𝒍 𝑻 = length scale of characteristic flame 𝑺 𝑳 = laminar flame speed 𝐕 𝐜 = volume of combustion chamber 𝑼 𝒆 = internal energy 𝛉= crank angle

Advantages Better starting of engine even in cold climatic conditions. Efficiently balances the temperature of chambers and other parts. Increase the Thermal Efficiency of the Engine. Diameter of the flame increases rapidly. Twin Spark plugs reduces the soiling of plugs.

Disadvantages The engine tends to overheat and loose power at higher speeds. Requires more investment for replacing the plugs. The engine wear and tear is somehow increased and hence these engines need frequent checkup.

Statistics The following are the various statistics showing the advantages of application of DTSi & its derived technologies i.e. the comparison of various aspects of 150 cc category and 125 cc category bikes.

So, finally I conclude….. Perfect Combustion in Internal Combustion engine is not possible. DTSI system helps for instantaneous burning of fuels. To overcome the requirements, new patent DTS-i is introduced.

References www.google.com www.bajajauto.com www.wikipedia.com Internal Combustion Engines by V Ganeshan

Presented by : Soumen Das 3rd yr. Mechanical Engineering Roll No. 09101007038 Sec : B1 Jalpaiguri Govt. Engg. College

Guided by : Dr. N. Mukhopadhyay [B.E , Ph.D., M.B.A.]