Common rail diesel engines

Diesel Common Rail engines

A common rail diesel engine is quite similar to a normal diesel engine; the only real difference from a normal diesel engine is the fuel injection system. The common rail direct injection system uses electronic circuits to control how much fuel is being injectected into the cylinders.

Also the Injection timing, Start of injection, Injection quantity and the injection pressure are all accurately controlled with electronic control unit.A high pressure pumpdriven by the engine shaft, is used to pump in very high pressure fuel from the tank and into the common rail.

A common rail is basically a hollow shaft by which the fuel is delivered and maintained at a very high pressure (which is about 2000 bar). During the firing sequence of that particular cylinder, the high pressure electronically operated injector will be opened and fuel with a pressure of 2000 bar is injected directly in to the cylinder.

This high pressure fuel will be atomised completely and leads to complete combustion of the fuel, thus avoiding bad emission.