Post on 06-Aug-2015
Direct Fuel injection is a developed technology that allows
gasoline engine to burn fuel efficiently ….
What will be the result By implementing GDI..???
By The Implementation of GDI , it provides cleaner emission , increased fuel economy and more energy in engine.
How did fuel injection work before direct injection?
The current gasoline ICE depends on 3 factors to make a perfect Air-fuel Mixture..: Oxygenated Air Fuel and Spark…..
Types of Injection System Previously used..
Single –Point Injection System Multi-Point Injection system
But previously the air-fuel mixing done by carburetors and single-point fuel injection systems that results in providing more fuel to first cylinder and too less to last cylinder.
Multi – Point Fuel Injection
How does direct injection improve performance?
In direct Fuel Injection system the air and fuel are pre-mixed but in gasoline direct injection system they are not pre-mixed.
Air Comes through intake manifold and gasoline directly injected into cylinder. Then the solution forms inside the cylinder.
This solution allows the fuel burn more thoroughly and that gives a better mileage and more power to the wheels.
How the GDI will process more efficient fuel rather than other system..??
Leaner Mixture Vs Rich Mixture
When the amount of air is high in oil-fuel
mixture it’s called leaner mixture
When fuel percent is high that is called
rich mixture
Efficiency of GDI
The exact Air-fuel mix used By GDI
is 40:1
instead of 14:7:1 that a
normal gasoline
engine mix
These substance of air-fuel mixture decompressed within the combustion chamber and causes
unburned fuel at the end.
The fuel placed directly to the hottest combustion chamber that give a better mileage.
But in normal gasoline engine the fuel compression ends near to spark plug
The Efficiency Of GDI chamber
Fuel Rail
Special Programming used By EMC
Catalytic Convertors
Different parts used By GDI
This special programing system calculates the flow rate, fuel droplet size, emissions controls etc that provide a better air-fuel mixture to the engine.
The Special catalytic convertors handles the direct injection engines' notoriously high oxides of nitrogen emissions that is very much harmful for environment.
Components of a Direct Injection Fuel System
Common Rail System
Distributor and Inline
Pump System
Unit Direct System
Common Rail System -- A long metal cylinder distributes fuel to the injectors under extremely high pressure
Distributor and Inline Pump System – This system refers to either a rotary wheel distributor or plunger-style pump that is used to push pressurized fuel to the injectors
Unit Direct System -- In this setup, the injector and a fuel pump is integrated into single unit and spray the mixture over each cylinder
The advantages of GDI
Accurate control over air-fuel
Mixture
Optimal spray pattern that
breaks gasoline into smaller
droplets
More complete combustion ,
more gasoline burned
More energy output and
less pollution
Complex work process
Most expensive
More rugged components used for withstanding the head and pressure
The Limitation Of GDI