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Friday, 8 September 2017

HOW FUEL INJECTOR WORKS

HELLO FRIENDS ,
               Today we will know about fuel injectors.Almost in every engine (i am talking about IC engine not electric vehicles ) uses fuel injectors. Fuel injector are those parts which sprays fuel into the engine . It doesn't sprays continuously, it sprays for very little time then stops, again then sprays then stops.This happens so fast .So let's know how it sprays fuel in atomised form so fast within a small time.

HOW-FUEL-INJECTOR-WORKS

In engines with multipoint injection, the injector injects fuel into individual intake tubes directly in front of the engine intake valve on the top part of the engine. The injection valve or nozzle valve is held against the valves outlet by a helical compression spring. A movable plunger is rigidly attached to the nozzle & supported in a guide in the lower section of the injector body. The plunger is acted in by a solenoid winding, wired on to the injector body. Each end connects to a terminal, the control unit completes the injector electrical circuit. It provides pulses of a set duration. So that the injector valves opens & closes or moves very quickly. Electrical pulses pass through the injector winding and creates a magnetic field which pulls the plunger up due to which a path is opened for fuel passing. So with that the nozzle opens for that specified period. Fuel under pressure on the fuel rail can now pass through the filter at the center of the injector & enter the inlet port.

In the single whole injector fuel is injected in a finely atomized conical spray at an angle about 25degree. The exact injector open time depends on the gap that the sensors give to the ECU. But it usually varies from 1- 20 milliseconds. For a standard engine valve lifts from fully closed to fully open position is about 0.15 mm & response time is about 1 mm. Rubber moldings or wearing sill the injector in manifold & at the fuel rail.  This helps to prevent the transfer of heat to the injector & the formation of fuel vapor bubbles in the heat conditions. Direct applied injectors operates on a same solenoid principles. For efficient fuel delivery fuels are directed towards each other, so that they will collide breaks into a cone shape. For directing those fuels a special type plate is used in injector which have 4 hole & bends a little bit so that fuel can be collide at a single point. In some engine with 2 intake valves the injector have 4 holes, but only 2 jets directs towards each valve. This ensures good fuel distribution for efficient combustion & emission control. The jets are set very precisely. That must be located accurately by means of the fuel rail. 

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