Fuel Injection: 4 Different Fuel Injection Systems of Diesel Engine

(Last Updated On: 18/04/2018)

Fuel Injection means the supply of fuel in the combustion chamber of an internal combustion engine.

The injection of fuel is done by a part named Injector.

In a petrol engine, fuel injection is carried out by a carburettor.

Fuel injection atomizes the fuel through a small nozzle under high pressure.

Carburettor relies on suction created by intake air accelerated through a venturi tube to draw the fuel into the mainstream.

There is various fuel injection system used in automobile engineering. Here you find all of them.

fuel injection system of diesel engine

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So, Here are Fuel Injection System in Diesel Engine

  • Air Blast Injection

This is an old method which is obsolete nowadays. In this method, Air is compressed at very high pressure by means of an Air Compressor.

A blast of this Air is then injected carrying the Fuel along with it into the Cylinder.

Due to varying Pressure of Injection Air the rate at which the fuel is admitted can be effectively controlled.

The combustion takes place nearly at Constant Pressure.

Due to High-Pressure, Air Compressor weight increase and a net output of Engine is decreasing. 

  • Solid Injection

This is an Airless Injection System. Hence the fuel under Pressure is directly injected into the combustion chamber at Atomized State.

This is useful for small and also for big Diesel Engines.

It requires a Pump to deliver the fuel at High Pressure.

This Fuel Injection System further divided into two systems.

  • Individual Pump System

In this system, each cylinder has its own individual high-pressure pump and a metering unit also.

This is a quite compact system.

It has a higher manufacturing cost due to close tolerance are required at production. 

  • Common Rail System

The Fuel is pumped by a Multi-Cylinder Pump into a common rail, the pressure in which is controlled by a Relief Valve.

The Advantages of Solid Fuel Injection System

01) Simple in construction

02) Lighter in weight

03) Lower Fuel consumption

04) Lower initial cost

05) No High-Pressure Air compressor required to start the Engine

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