Describe the working of high pressure pump used in CRDI system.

Describe the working of high pressure pump used in CRDI system.
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1 Answer

Answer :

Working of High Pressure Fuel Pump Used In CRDI System:

* The fuel inlet to the pump is controlled by the SCV (suction control valve) through the EDC

* The rotation of the inner cam pushes the plunger inwards, so that it can pump the fuel.

* Plunger outward movement is caused by the pressure of fuel feed pump. Fuel enters the pumping element chamber (intake stroke)

* At BDC the check valve closes

* The fuel in the chamber is pressurized by the plungers moving inward.

* The delivery valve opens and the fuel passes to the common rail.

* A constant pressure of about 1400 to 1600 bar is maintained in the common rail.

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Figure: Sectional View of High Pressure Pump used in CRDI System

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