This document discusses gasoline direct injection systems. It begins with an introduction explaining that direct injection systems inject fuel directly into the combustion chamber, rather than mixing it with air in the intake manifold. It then describes different types of fuel injection systems and lists the major objectives of GDI engines as ultra-low fuel consumption, superior power, and stable combustion. The document goes on to discuss the advantages of GDI engines, such as lower fuel consumption and higher output, as well as applications in various car manufacturers. It concludes that GDI engines can reduce CO2 production by 20%, improve torque and fuel efficiency, and help meet emissions standards.

1. Gasoline Direct Injection system
Projected by:

2. INTRODUCTION:
 The direct injection system introduces the fu
el directly in the combustion chamber, which m
eans that only air enters the cylinder through th
e manifold and the mixture of air and fuel takes
place inside the combustion chamber.
 Gasoline engine works by sucking a mixture of
ga-soline and air in to cylinder.

3. Types Of Fuel Injection:
 The Carburetor
 Single-point or throttle body injection(TBI)
 Port or multi-point fuel injection (MPFI)
 Sequential fuel injection
 Direct injection

4. Major Objectives of the GDI engine:
•Ultra-low fuel consumption that betters that of even diesel engines
•Superior power to conventional MPI engines
•A Stable Combustion

5. Why Not Carburetor
Carburetor has following Disadvantages
Vapour lock,
Perfect air/fuel mixture cannot be obtained,
Lack of throttle response,
Low volumetric efficiency,
Icing – problem in aircraft engines,
Compromises on emission,

6. Gasoline Direct Injection system

7. MAJORCHARACTERISTICSOF THE GDI ENGINE
Lower fuel consumption and higher output
• Ultra-lean Combustion Mode
• Superior Output Mode

8. Recent Developments
A new 2.0 L DOHC 4-valve direct-injection (DI) gasoline engine
has been developed which features new technologies such as swirl
Intake ports pistons with a concave combustion chamber high-pressur
e fuel-injection
It has been confirmed that a vehicle with this system successfully
improves fuel economy while satisfying emission requirements.

9. BASIC TECHNICAL FEATURES OF GDI ENGINE

10. ADVANTAGES:
 Improves volumetric efficiency of the engine.
 Improves atomization and vaporization of fuel and it is ind
ependent of reduce gap spacing speed.
 Ease of cold starting and low load running.
 Specific fuel consumption is reduced i.e. it gives better veh
icle mileage.
 Variation of air fuel ratio is reduced.
 Exhaust emissions are reduced.

11. Disadvantages:
 Non uniform distribution of mixture in multi cylinder engine and h
ence loss of thermal efficiency
 Loss of volumetric efficiency due to restriction for the mixture flo
w and possibility of back firing.

12. applications:
 Toyota
 Nissan
 Mercedes-Benz GDI Combustion System
 Mazda GDI Combustion System
 Ford motor company
 Hyundai sonata

13. Future scope:
 The biofuels like ethanol, methanol, but and their blends with petrol
can be successfully used in direct injection engines
 With the use of biofuels in direct injection engines the pollution can
be reduced and efficiency can be increased.
 The existing two stroke engines in market can be redesigned with di
rect fuel injection system instead of existing carburetor system

14. CONCLUSION
 Reduction of CO2 production by nearly 20 percent.
 Provides improved torque 5-10%
 Fulfills future emissions requirements.
 97% NOx reduction is achieved.
 Improve the brake specific fuel consumption.
 Smooth transition between operation modes.
 Reduced fuel consumption 15-20%
 Up to 5% more power
 Spontaneous response behavior

15. THANK YOU