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SEMINAR ONTURBO DIRECT INJECTIONENGINES
BY- NAKUL SINGH
7AE-033
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DIESEL ENGINES
In 1893, a German engineer namedRudolf Diesel perfected the compression-
ignition engine that bears his name The diesel engine uses heat created by
compression to ignite the fuel, so itrequires no spark ignition system.
A lot of changes have been boughtabout in diesel engines since first enginewas invented.
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TDI
(TURBO CHARGED DIRECTINJECTION)
Developed and produced by volkswagongroup
TDI or Turbocharged Direct Injection is adesign of turbo diesel engines, whichfeature turbocharging and cylinder-direct fuelinjection
Turbocharged direct injection is innovativeengine design that delivers a combination of
1.Performance.2.Fuel economy .3. Low emission
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CONSTRUCTION
Mass air flow sensor
Turbocharger
Intercooler
Direct fuel injector
Engine control unit
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MASS AIR FLOW SENSORS
Converts the amount of air entering intothe engine into voltage signals
Located directly in between air cleanerand throttle body
ECM needs to know the amount of intakeair volume
Necessary to determine how much fuel tobe injected inside cylinder
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TURBOCHARGER
Centrifugal compressor powered by high
speed turbines, driven by engine exhaust
Improves volumetric efficiency of the engines.
The function of turbocharger is to increase the
amount of air entering the engine.
The power and the torque increases
tremendously compared to an enginewithout a turbocharger
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SCHEMATIC DIAGRAM
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INTERCOOLERS
Mechanical device used to cool fluidincluding liquid and gases
Increase efficiency of the inductionsystem by reducing air induction heat
Lowering of intake charge temperatureeliminates the danger of predetonation
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ENGINE CONTROL UNIT(ECU) Electric control unit that controls the series of actuators
of on an internal combustion engine Does this by reading values from a multitude sensors in
the engine bay Functions
Control of Air/Fuel ratioControl of idle speedControl of variable valve timing
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WORKING OF TDI
TDI engine uses a computer controlled
injection system.
Fuel is directly sprayed into the combustionchamber at very high pressure
This helps in promoting complete combustion
Fuel injector sprays atomised fuel directly into
the main combustion chamber ofeach cylinder.
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IMPROVEMENTS OVERPREVIOUS DIESEL ENGINES
More power
Less smoke
Better fuel consumption
Cold start
Turbo lag
Lower compression ratio
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ADVANTAGES
Eco conscious
Increased efficiency
Max output with minimum fuelconsumption
High torque
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DISADVANTAGES
Low rpm
High cost
Space requirement
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