With the accelerated consumption of fuel in day-to-day life, there is an augmenting demand for the development of a more fuel efficient engine. Further , there is a growing concern for the reduction of emissions that emanate from vehicles .In order to cater to all these heeds, AUDI has come up with an amazing technology called TDI (TURBOCHARGED DIRECT INJECTION) . The inception of this incredible technology has created a revolution in diesel engines. It has made diesel engines much more efficient than its ancestors as well as its rival gasoline engine, by ensuring optimum cylinder charging. This is accomplished by incorporating a crucial component called the turbocharger. Components like piezoelectric injector, EGR, common rail, VTG consummate this engine, bolster in achieving a phenomenal performance. The most common discrepancy we found in diesel engines was turbo lag. We have introduced a modification in this engine which we perceive that it would serve as a solution for the turbo-lag. In this technique we give feedback for the turbocharger by using a DC SOLENOID MOTOR till the boost threshold is reached, by the actuation of sensors. And we have also introduced the Principles of Hydrodynamic Design Of Humpback Whale to increase the efficiency of the turbo charger at any running conditions.

1. INVESTIGATION OF TDI CONCEPET AND CONCEPTUAL ERADICATION
OF TURBO LAG BY INCORPORATION OF SOLENOID MOTOR WITH THE
AID OF HYDRODYNAMIC DESIGN
M.ASHWIN
C.VARUN
P.BHUVANESWARAN

2. What is TDI?
• TDI is expanded as Turbo-charged Direct
Injection
• It was incorporated in diesel engines to
increase performance and fuel efficiency.
• TDI offers a lot of boost to the engine, without
sacrificing fuel economy.

3. EVOLUTION
• TDI technology was first founded by AUDI, a
subsidiary of Volkswagen in the year 1989.
• The next major development in the TDI concept
took place with implementation of common rail
system in 2003.
• Piezo electric injection replaced all the
conventional injection methods from early 2009.
• Later EGR concept was developed in concern for
the environment

4. CORE COMPONENETS
• TURBO CHARGER
• COMMON RAIL DIRECT INJECTION
• EXHAUST GAS RECIRCULATION

5. TURBO-CHARGER
• Cylinder charging device which
uses the exhaust gas as a
driving source.
• It forces more air into the
combustion chamber.
• Increases the efficiency of
the engine.

6. VTG TURBO-CHARGER
• VTG refers to variable turbine geometry.
• Used for varying the aspect ratio of the turbo-
charger continuously.
• Increased performance of the turbo- charger at
all running conditions, especially at low speed
of engine.

7. VTG WORKING

8. COMMON RAIL DIRECT INJECTION
• The common rail system prototype was
developed in the late 1960s by Robert Huber.
• It is a pressure accumulator device which uses
direct injection at a pressure of 1000 bar -
2000bar.
• Here each injector is opened electronically
rather than mechanically.
• The injection process is divided into 3 phases
– pre, main and post injection.

9. WORKING OF CRDI
• A typical common rail of TDI engine

10. EXHAUST GAS RECIRCULATION
• EGR is a nitrogen oxide emission reduction
technique used in TDI engine.
• EGR operates by recirculating of a minimal
amount of the exhaust gas back to the
combustion chamber.
• Dilution of oxygen in the fresh intake and
provides inert gases as absorbents.
• These inert gases helps in preventing the
combustion chamber from reaching its
maximum temperature.

11. MODIFICATION
• The most common defect found in TDI
engine’s is Turbo Lag.
• Turbo lag is the time delay for the activation
of turbo charger.
• Initial boost is prevented because of turbo lag.
• Fuel economy is reduced due to more intake of
fuel during the low engine speeds.
• Causes great inconvenience to the driver due
to the lack in initial boost.

12. FEEDBACK USING SOLENOID MOTOR
• During turbo-lag period turbine is driven by
means of solenoid motor. (5000 rpm)
• The solenoid detaches the motor from the
turbine upon threshold RPM (turbo activation)
• This motion of the solenoid is controlled by
the ECU
• The engine RPM info is fed to the ECU by the
crank shaft position sensor.
• Excess pressure is relieved by a wastegate .

13. HYDRODYNAMIC DESIGN OF
HUMPBACK WHALES
• The elongated pectoral fins of humpback
whales have good aerodynamic qualities.
• This idea is induced in the turbocharger by
replacing the conventional turbines.
• Elongated pectoral flippers are introduced at
the sides of turbine blades.
• This reduces drag on the blade increasing
turbine speed by 30%.

14. WHY DRIVE A TDI ??
• It offers exceptional boost to the engine
• It delivers high performance with low
consumption of fuel.
• EGR significantly reduces NOx that is
produced during combustion.
• CRDi helps in achieving maximum output from
the fuel that is consumed.

15. CONCLUSION
• The detailed working of TDI engine with its
pros and cons were considered
• The vast potential of TDI created a
breakthrough in diesel engines.
• Certain modification has been suggested for
the hindrances that prevail in the current
scenario.