1. SEMINAR ON TURBO DIRECT INJECTION ENGINES
BY- NAKUL SINGH
7AE-033

2. DIESEL ENGINES
In 1893, a German engineer named Rudolf Diesel perfected the compression-ignition engine that bears his name
The diesel engine uses heat created by compression to ignite the fuel, so it requires no spark ignition system.
A lot of changes have been bought about in diesel engines since first engine was invented.

3. TDI (TURBO CHARGED DIRECT INJECTION)
Developed and produced by volkswagon group
TDI or Turbocharged Direct Injection is a design of turbo diesel engines, which feature turbocharging and cylinder-direct fuel injection
Turbocharged direct injection is innovative engine design that delivers a combination of 1.Performance. 2.Fuel economy . 3. Low emission

4. CONSTRUCTION Mass air flow sensor Turbocharger Intercooler
Direct fuel injector
Engine control unit

5. MASS AIR FLOW SENSORS
Converts the amount of air entering into the engine into voltage signals
Located directly in between air cleaner and throttle body
ECM needs to know the amount of intake air volume
Necessary to determine how much fuel to be injected inside cylinder

6. 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 engine without a turbocharger

7. SCHEMATIC DIAGRAM

8. INTERCOOLERS
Mechanical device used to cool fluid including liquid and gases
Increase efficiency of the induction system by reducing air induction heat
Lowering of intake charge temperature eliminates the danger of predetonation

9. 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 ratio
Control of idle speed
Control of variable valve timing

10. WORKING OF TDI TDI engine uses a computer controlled injection system.
Fuel is directly sprayed into the combustion chamber at very high pressure
This helps in promoting complete combustion
 Fuel injector sprays atomised fuel directly into the main combustion chamber of each cylinder.

11. IMPROVEMENTS OVER PREVIOUS DIESEL ENGINES
More power
Less smoke
Better fuel consumption
Cold start
Turbo lag
Lower compression ratio

12. ADVANTAGES Eco conscious Increased efficiency
Max output with minimum fuel consumption
High torque

13. DISADVANTAGES
Low rpm
High cost
Space requirement