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Common Rail System Of Fuel Injection

Posted on 2/15/2016 3:05:12 PM

In early and mid-19th century,the common rail fuel injection systems was used in the marine diesel engine,called the "Doxford" engines or opposed piston engines.Nowadays they are replaced by more efficient engines.

Because the modern strictly emission rules,common rail direct fuel injection systems are highly used in some modern vehicles.We could see it not only in the diesel engines,but also in petrol/gasoline engines.

One or more common high pressure,multiple plunger,fuel pumps consist of the common rail system.Different components play it role in the system.The fuel is discharged into a manifold preferably called a "rail" which is maintained at a very high pressure. From this common rail, fuel is supplied to all the fuel injectors in the various cylinder units. Between the rail and the injector or injectors for a particular cylinder is a "timing valve" which determines the timing and extent of fuel delivery. Spill valves are connected to the manifold or rail to release excess pressure and accumulator bottles are included to dampen out pump pressure pulses. The injectors in a common rail system are often referred to as fuel valves.

The timing valve in the common rail system is operated by a cam and a lever.When the timing valve is lifted by the cam, the lever also is lifted, thus ensuring that the valve in the timing valve block allows the high pressure fuel oil to reach the fuel injectors. Also, the timing valve operating lever is fixed to a sliding rod. This sliding rod is in turn fixed with the manoeuvring lever, which in turn governs the amount (quantity) of the fuel to be injected into each cylinder unit, meeting the load demands on the engine.

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