What Is A CRDI?  The letters CRDI stands for Common Rail Direct Fuel Injection.  It is a fuel injector working on common rail design, that’s injects fuel in Petrol as well as in Diesel engines.

History of CRDI History of CRDI  It was developed in the late 1960s by Robert Huber.  In Swiss Federal Institute Of Technology Switzerland.  Its first successful vehicle began in Japan by the mid- 1990s by a Japanese automotive parts manufacturer.  The concept of direct-injection is older concept now the common-rail design is quite a step forward.  In1997 it comes in use for first passenger car Alfa Romeo and later on that same year Mercedes-Benz C 220 CDI.

Common Tube Or Rail Common Tube Or Rail  Fuel in the common tube or “rail” is under a set amount of pressure.  Which causes the fuel to be “atomized” or broken down to its smallest particles.  This allows the fuel to combine with the air much more efficiently.  With proper direct injection, fuel use is highly efficient, with much less waste fuel escaping the system unused.

HOW DOES C.R.D.I WORKS?  The CRDI engine is designed with a common rail for supplying equal amount of fuel to all cylinders at a desired pressure using a pressure regulator attached to it. The pressure regulator, controls the pressure of the air supplied into the cylinders thorough the inlet valve.  These valves are Solenoid or Piezoelectric valves that electronically control the fuel injection time and quantity and the higher pressure that provides better fuel atomization.

 ECU(electronic control unit), it is a electronic device that allow to inject a small amount of diesel just before the main injection event (Pilot Injection) by using sensors.  This reduces the explosiveness and vibration.  Common rail engines require very short (< 1 s) or no heating up time at all and produce lower engine noise and emissions than older systems.

FEATURES OF CRDI  On diesel engines, it gives a high-pressure (over 1,000 bar/15,000 psi) fuel rail feeding individual solenoid valves, as opposed to low-pressure fuel pump feeding unit injectors.  Third-generation common rail diesels now feature piezoelectric injectors for increased precision, with fuel pressures up to 1,800 bar/26,000 psi.  In gasoline engines, it is used in gasoline direct injection engine technology.

ADVANTAGES ADVANTAGES  For diesel vehicles CRDI helps to improve the performance by as much as 25 percent.  It provides more power and makes the technology more attractive for passenger vehicles.  Engines with CRDI run much more smoothly, with efficiency greatly enhanced by higher pressure possible in the common-rail.  CRDI method greatly reduces engine and vehicle vibration.  Gives better fuel economy.  Reduces the cost of operation significantly.

DISADVANTAGES DISADVANTAGES  CRDI engine is a little more expensive than older technologies.  But the savings in fuel cost can help recoup the initial expensive over time.

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