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Chapter: Mechanical : Advanced IC Engines : Recent Trends

Common Rail Diesel Fuel Systems

● High pressure accumulator (common rail) ● Typical fuel rail pressure with engine idling and at running temperature: ● approximately between 300 – 400 Bar (4410 – 5880 psi)

Common Rail Diesel Fuel Systems

 



 

 

Common Rail Diesel Fuel Systems

 

      High pressure accumulator (common rail)

 

      Typical fuel rail pressure with engine idling and at running temperature:

 

      approximately between 300 – 400 Bar (4410 – 5880 psi)

 

      Health and safety

 

      Due to the extremely high working fuel pressures in the common

 

      rail fuel system, NEVER slacken fuel or injector pipes or try to

 

      disconnect components of the fuel system whilst the engine is

 

      running and high pressure is present in the system!

 

      Typical maximum possible fuel rail pressure:

 

●  approximately between 1600 – 2000 Bar (23520 – 28400 psi)







 

 

Advantages of common rail:

 

Fuel pressure available on demand.....

 

Higher injection pressures and finer atomization of fuel.....

 

Injection pressure created independent of engine speed.....

 

Multiple injections per cylinder combustion are possible.

 

 

Reduction of overall exhaust emissions.....

 

Reduction of particulate emissions.....

 

Reduction of noise emissions.....

 

Improved fuel efficiency.....

 

Higher performance.

 

 


Gasoline Direct Ignition Engine



 


      First, the fuel travels via pump from the fuel tank, through the fuel line and into fuel injectors that are mounted into the engine.

 

      The injectors spray gasoline into the air intake manifold, where fuel and air mix together into a fine mist. At precisely timed intervals, intake valves open, corresponding to the different cylinders of the engine.

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