gasoline direct injection
DESCRIPTION
nói về động cơ gdiTRANSCRIPT
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Gasoline Direct Injection
GDI
GDI
GDI
- IntroductionAdvantages of Fuel Injection over CarburetorMain
Components of Electronic Fuel InjectionElectronic Fuel
InjectionMulti Point Fuel InjectionGasoline Direct InjectionThe
Difference Between New GDI And Current MPITechnical featuresMajor
characteristics of the GDI engineRealization of lower fuel
consumptionVehicle Fuel ConsumptionRealization of Superior
OutputAchievementsConclusion
THE WAY WE PROCEED...
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INTRODUCTION
Transition of Fuel Supply System
Carburetor
Port Injection
(MPFI)
Direct Injection
(GDI)
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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
Engine Control Unit Sensors3. 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
Oxygen
Sensor
Exhaust
Closed loop Operation mode
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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. -
ELECTRONIC FUEL INJECTION
Multipoint Fuel Injection Gasoline Direct Injection - 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
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GASOLINE DIRECT INJECTION
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COMPARISON WITH MPFI
3.3
50
Fuel Pressure (MPa)
Port Injection
In-Cylinder Direct Injection
Fuel System
Standard
Upright Straight
Intake Port
Flat top Piston
Curved Top Piston
Combustion Chamber
10.5
12.0
Compression Ratio
Intake: 2, Exhaust: 2
Number of Valves
IL-4
Number of Cylinders
1834
Displacement
81.0 x 89.0
Bore x Stroke (mm)
Conventional MPFI
GDI
ITEM
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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 AirflowFuel SprayOptimized Configuration of the
Combustion Chamber
Click Here
Click Here
Click Here
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REALIZATION OF LOWER FUEL CONSUMPTION
Basic Concept Combustion of Ultra-lean MixtureClick Here
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Vehicle Fuel Consumption
Fuel Consumption During Idling Fuel Consumption during Cruising Drive - Emission Control
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REALIZATION OF SUPERIOR OUTPUT
Improved Volumetric Efficiency Increased Compression Ratio -
ACHIEVEMENTS
Engine performanceVehicle Acceleration -
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