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ASeminar report on
Turbocharged Direct injection
By Guide By
Mr. Banswal J.S. Prof. V.A.Kulkarni
INTRODUCTION This system is developed by
Volkswagen group Direct injection diesel system Forced induction by way of
turbocharger to increased amount of air
Used intercooler to lower temp( increase density)
As high compress air supply, increasing amount of fuel injected
This combination allow greater engine efficiency
TDI engine is turbopcharged and intercooler diesel engine
Turbo provide more torque Fuel injector sprays directly into main
combustion rather than separetess
Improvements over previous Diesels
Fuel injection system are electronically control
Injection timing are quantity are electronically control
Variable geometry turbocharger are used
Electronically emission control (EGR) system
Common rail system
Simple working
Air is drawn through intercooler Then compressed in turbocharger Intercool is used to decrease temp. After cooled density is increses Then pass to intake manifold ,mixed
with exhaust from EGR for emission control
There is no throttle,piezo electric valves injected high pressurised fuel
Components of TDI system
Turbocharger MAF meter Intercooler Piezo elextric valves Glowplug EGR
TURBOCHARGER Increase amount of air (density) Locate at exhausr side Convert exhaust to mechani- cal work Compressor wheel is driven
by shaft High Compress air in the turbocharger passed to intake
Difference between Turbo & Super Both are forced induction In super there is belt that connects
directly to the engine A turbo gets its power from the
exhaust steam Turbo are more efficient ,it uses wasted
energy for its power source Turbo creates back pressure Supercharger are more expensive
Exhaust Gas Recirculation
NOx emission reducti – on technique Works by recirculating portion of engines exhaust Reduced throttling losses Reduced heat rejection Reduced chemical dissociation Reduced specific heat ratio
Piezo Injectors-making a quick switch Precision in controlling injec- tion process Operate 5 times more quickly Reduced fuel consumption & emission Actuated by piezo crystals Reduced fuel consumption =3% Lower pollutant emission = 20% Increase engine power = 5% Reduction in noise =3 decibles
Common Rail System Steel rigid pipe line Pressure available permanently Pressure generation &fuel injection independently Improve pulverization process Fuel economy = 25-35% Noise reduction due to more synchronized timing operation
Glowplug At cold condition engine unable to start Not generate & maintain enou- gh heat to ignite fuel Heating device to warm the engine Below 10sec even at -10 celcius Older engine choke = 3 MPFI or CRDI sensor is used =1.5 In TDI normal supply = 0.3
Top selling TDI diesel cars Volkswagen Passat (B5)
Audi A3
Volkswagen Golf Turbo
Mercedes Benz 320 Blue Tec Turbo BMW Alfa Romeo Volkswagen Jetta TDI
Advantages Enjoy the saving Economical fuel consumption Long service & Maintenance Low emission Good energy efficiency Disadvantages Cost is high Complicated engine structure Take more time
