31-08-2017, 12:00 PM
Fuel injection is the introduction of fuel into an internal combustion engine, more commonly automotive engines, by means of an injector. All diesel engines use fuel injection by design. Gasoline engines can use direct gasoline injection, where the fuel is delivered directly to the combustion chamber, or indirect injection where the fuel mixes with the air before the intake stroke.
The main difference between carburetors and fuel injection is that the fuel injection atomizes the fuel through a small nozzle at high pressure, whereas a carburetor is based on the suction created by the accelerated intake air through a Venturi tube to draw fuel into the air stream.
Two main types of nozzles can be mounted, depending on whether the injection system is controlled mechanically or electronically.
In a mechanical system, the injector is loaded elastically in the closed position and is opened by the fuel pressure.
The injector in an electronic system is also kept closed by a spring, but is opened by an electromagnet incorporated in the injector body. The electronic control unit determines how long the injector remains open.
The main difference between carburetors and fuel injection is that the fuel injection atomizes the fuel through a small nozzle at high pressure, whereas a carburetor is based on the suction created by the accelerated intake air through a Venturi tube to draw fuel into the air stream.
Two main types of nozzles can be mounted, depending on whether the injection system is controlled mechanically or electronically.
In a mechanical system, the injector is loaded elastically in the closed position and is opened by the fuel pressure.
The injector in an electronic system is also kept closed by a spring, but is opened by an electromagnet incorporated in the injector body. The electronic control unit determines how long the injector remains open.