GDI GDI GDI
Gasoline Direct Injection
Prepared By:
Abhishek Jaiswal ME-VI Sem.
Guided By:
R. J. Yadav
Lecturer,
ME Dept.,
CET-IILMAHL, G. Noida
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 electronically controlled valve.
but
an
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 Bore x Stroke (mm) Displacement Number of Cylinders Number of Valves Compression Ratio Combustion Chamber Intake Port Fuel System Fuel Pressure (MPa) 81.0 x 89.0 1834 IL-4 Intake: 2, Exhaust: 2 12.0 Curved Top Piston Upright Straight In-Cylinder Direct Injection 50 GDI Conventional MPFI 10.5 Flat top Piston Standard Port Injection 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
