BY:

ALOK MANI TRIPATHI 1110910004

CRDI

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 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 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.

http://en.wikipedia.org/wiki/File:Common_Rail_Scheme.svg

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 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

CRDI engine is a little more expensive than older

technologies.

But the savings in fuel cost can help recoup the initial

expensive over time.

THANK YOU