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					 GDI GDI GDI                Prepared By:
                              SANJITH C
Gasoline Direct Injection     S7MB-120
                            Guided By:

                               ANOOP C G
                               Lecturer,
                               MED,
                               N.S.S.C.E.
             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
   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
                    INTRODUCTION
Transition of Fuel Supply System

     Carburetor      Port Injection   Direct Injection
                        (MPFI)            (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             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

   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
GASOLINE DIRECT
   INJECTION
                   COMPARISON WITH MPFI


         ITEM                       GDI               Conventional MPFI

Bore x Stroke (mm)    81.0 x 89.0                    

Displacement          1834                           

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
In-cylinder Airflow




                                                     Click Here
Fuel Spray




                                                     Click Here
                                                     Click Here
Optimized Configuration of the Combustion Chamber
REALIZATION OF LOWER FUEL CONSUMPTION

 Basic Concept




                                    Click Here
Combustion of Ultra-lean Mixture
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 performance




Vehicle 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

				
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posted:4/8/2012
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