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What is Common Rail ?  [24/09/2010]

As it's name suggests there is a common rail that acts as an accumulator to feed fuel to all of the injectors. Filtered fuel is supplied to the rail by means of a high pressure pump.

 

1 = High Pressure Pump

2 = High Pressure Rail

3 = Electronic Control Unit

4 = Injector

Unlike various other diesel fuel injection systems where the injector only receives fuel pressure once the injection pump has metered an amount of fuel for that cylinder, the common rail system stores a constant amount of high pressure fuel at the rail and right up to the injectors.

The main advantage of this system is to vary injection pressure and timing over a broad scale leading to many benefits in engine design, improved driveability and greatly reducing it's environmental impact.

Therefore the heart of the common rail system is the injectors and electronic software and hardware.

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