Recent trend of GDi

1. Elumalai Polytechnic College
Topic: Gasoline Direct Injection
ANANDA BABU P
SEENU VASAN M
Department of Automobile Engineering

2. G
D
I
Engine
Technolog
y
Gasoline Direct Injection

3. Contents
 Introduction
 Timeline of Fuel supply system
 Main Component of Gdi
 Electronic Fuel Injector
 Multipoint Fuel Injector
 Gasoline Direct Injector
 Working and Burning Mode
 Achievements
 Conculsion

4. INTRODUCTION
 At a time of even greater demand on automotive
manufactures to further improve,
◦ fuel efficiency ,
◦ Performance and
◦ emission standards
 Gasoline direct injection (GDI) engine technology to
improve Engine efficiency without making a major shift
away from conventional IC technology
 But, for larger vehicles, port fuel injection was still not a
100 % success. This was due to its large engine size, and
improper combustions.
 So, the birth of the Gasoline Direct Injection (GDI) took
place

5. Timeline of Fuel Supply System
Carburetor Port Injection Direct Injection
(MPFI) (GDI)

6. MAIN COMPONENTS OF GASOLINE
INJECTION
1. Engine Control Unit 4. Fuel Injector
2. Sensors
3. High pressure Fuel Pump
Engine Control Unit (ECU)
 ECU is a HEART of The Engine .
Ecu is computer that controls all of the electronic Components on
the engine.
Working of Ecu
•Control of fuel mixture
•Control of ignition timing
•Control of idle speed
•Control of variable valve timing
•Electronic valve control

7. Sensors
 In order to provide the correct amount of fuel for every operating
condition, the ECU has to monitor a huge number of input sensors.
•Acceleration pedal
sensor
•Airflow sensor
•Hi pressure pump
sensor
•CrankAngle sensor
•GDI

8. Injector
A fuel injector is nothing but an electronically controlled valve.
When the injector is energized, an electromagnet moves a plunger that
opens the valve, allowing the pressurized fuel to squirt out through a tiny
nozzle.
It is controlled by the ECU.

9. ELECTRONIC FUEL INJECTION
1. Multipoint Fuel Injection 2.Gasonline Direct Injector

10. MULTI POINT FUEL INJECTION SYSTEM
 Have a separate fuel injector for each cylinder .
 Have better cylinder to cylinder distribution.
 Eliminate the need to preheat the intake manifold

11. Gasoline Direct Injection
•GDI is a process where a mixture of fuel
and air is sent into the engine through a
highly pressurized.
•The injector is connected along with the
intake valve, exhaust valve and the spark
plug
•The injector, injects the mixture
according to the speed of the engine. The
intake valve is used for only air.
•More air means more combustion.
•Compression ratio is high as 12.5:1 at its
peak value,

12. Working GDI
Air flow Sensor
Acceleration
ECU SP
Pedal
HI Pressure Fuel
GDI
pump
IC Engine

13. GDI Burning mode
1. Ultra-lean burn mode: At lower
speeds, the mixture is injected at the end of
the compression stroke for lowest heat
losses. This is when the compression ratio
in the cylinders is maximum
2. Stochiometric mode: This is the
conventional method of injection during the
intake stroke for optimum combustion and
minimum waste gases during moderate city
driving conditions.
3. Full Power mode: Fuel is injected in the
intake stroke at a higher .This is done at
high speeds or high load conditions like
climbing a hill.

14. Requirement of GDI Engine
 The Upright Straight Intake Port.
 The Curved-top Piston.
 The High Pressure Fuel Pump.
 The High Pressure Swirl Injector.

15. ACHIEVEMENTS
• Vehicle Acceleration Engine Performance
GDI
MPFI
0 5 10 15

16. Vehicle Fuel Consumption
 Fuel Consumption During Idling

17. Emission Control

18. CONCLUSION
Provides improved torque 5-10%
Up to 5% more power
Reduction of CO2 production by nearly
20 percent.
Fulfills future emissions requirements.
97% NOx reduction is achieved.
Improve the brake specific fuel
consumption.
Reduced fuel consumption 15-20%

19. Thank you