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...

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

Engine Control Unit 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

Oxygen

Sensor

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.

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

GASOLINE DIRECT INJECTION

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

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

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REALIZATION OF LOWER FUEL CONSUMPTION

Basic Concept Combustion of Ultra-lean Mixture

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Vehicle Fuel Consumption

Fuel Consumption During Idling Fuel Consumption during Cruising Drive

Emission Control

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