GDI GDI GDI Prepared By:
Gasoline Direct Injection S7MB-120
ANOOP C G
THE WAY WE PROCEED...
Advantages of Fuel Injection over Carburetor
Main Components of Electronic Fuel Injection
Electronic Fuel Injection
Multi Point Fuel Injection
Gasoline Direct Injection
The Difference Between New GDI And Current MPI
Major characteristics of the GDI engine
Realization of lower fuel consumption
Vehicle Fuel Consumption
Realization of Superior Output
Transition of Fuel Supply System
Carburetor Port Injection Direct Injection
ADVANTAGES OF FUEL INJECTION OVER CARBURETOR
☼ Fuel injection has no choke, but sprays atomized fuel
directly into the engine.
☼ Electronic fuel injection also integrates more easily with
computerized engine control systems.
☼ Multi port fuel injection delivers a more evenly
distributed mixture of air and fuel to each of the engine's
☼ Sequential fuel injection improves power and reduces
MAIN COMPONENTS OF ELECTRONIC FUEL INJECTION
1. Engine Control Unit
3. Fuel Injectors
Engine Control Unit (ECU)
ECU is a computer that controls all of the electronic
components on the engine.
Open loop Operation mode
ECU Engine Oxygen
Closed loop Operation mode
In order to provide the correct amount of fuel for every
operating condition, the ECU has to monitor a huge number
of input sensors.
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.
A pipe called the fuel rail supplies
pressurized fuel to all of the injectors.
ELECTRONIC FUEL INJECTION
1. Multipoint Fuel Injection
2. Gasoline Direct Injection
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
COMPARISON WITH MPFI
ITEM GDI Conventional MPFI
Bore x Stroke (mm) 81.0 x 89.0
Number of Cylinders IL-4
Number of Valves Intake: 2, Exhaust: 2
Compression Ratio 12.0 10.5
Combustion Chamber Curved Top Piston Flat top Piston
Intake Port Upright Straight Standard
Fuel System In-Cylinder Direct Injection Port Injection
Fuel Pressure (MPa) 50 3.3
BASIC TECHNICAL FEATURES OF GDI ENGINE
The Upright Straight Intake Port.
The Curved-top Piston.
The High Pressure Fuel Pump.
The High Pressure Swirl Injector.
MAJOR CHARACTERISTICS OF THE GDI ENGINE
Lower fuel consumption and higher output
• Ultra-lean Combustion Mode
• Superior Output Mode
Optimized Configuration of the Combustion Chamber
REALIZATION OF LOWER FUEL CONSUMPTION
Combustion of Ultra-lean Mixture
Vehicle Fuel Consumption
Fuel Consumption During Idling
Fuel Consumption during Cruising Drive
REALIZATION OF SUPERIOR OUTPUT
Improved Volumetric Efficiency
Increased Compression Ratio
Frequent operation in stratified mode.
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