gasoline direct injection
DESCRIPTION
GDI. GDI. GDI. Gasoline Direct Injection. THE WAY WE PROCEED. Introduction Advantages of Fuel Injection over Carburetor Main Components of Electronic Fuel Injection Electronic Fuel Injection Multi Point Fuel Injection Gasoline Direct Injection - PowerPoint PPT PresentationTRANSCRIPT
Introduction 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 Technical features Major characteristics of the GDI engine Realization of lower fuel consumption Vehicle Fuel Consumption Realization of Superior Output Achievements Conclusion
THE WAY WE PROCEED...
INTRODUCTION
Transition of Fuel Supply System
Carburetor Port Injection
(MPFI)
Direct Injection
(GDI)
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 cylinders.
☼ Sequential fuel injection improves power and reduces emissions.
MAIN COMPONENTS OF ELECTRONIC FUEL INJECTION
1. Engine Control Unit
2. Sensors
3. Fuel Injectors
Engine Control Unit (ECU)
ECU is a computer that controls all of the electronic components on the engine.
ECU Engine
Exhaust
Open loop Operation mode
ECU Engine OxygenSensor
Exhaust
Closed loop Operation mode
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.
Fuel Injectors
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.
Have a separate fuel injector for each cylinder .
Have better cylinder to cylinder distribution.
Eliminate the need to preheat the intake manifold
MULTI POINT FUEL INJECTION SYSTEM
3.350Fuel Pressure (MPa)
Port InjectionIn-Cylinder Direct InjectionFuel System
StandardUpright StraightIntake Port
Flat top PistonCurved Top PistonCombustion Chamber
10.512.0Compression Ratio
Intake: 2, Exhaust: 2Number of Valves
IL-4Number of Cylinders
1834Displacement
81.0 x 89.0Bore x Stroke (mm)
Conventional MPFIGDIITEM
COMPARISON WITH MPFI
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
In-cylinder Airflow
Fuel Spray
Optimized Configuration of the Combustion Chamber
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CONCLUSION
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