• br
  • entries
    352
  • comments
    1,273
  • views
    825,042

Contributors to this blog



5 Comments


Recommended Comments

CRDI means Common Rail Direct Injection.. In crdi contains a small tube is called Common rail where the injectors are connected and contains fuel at a constant high pressure of 1,350 bars. The CRDI engine small amount of fuel into the engine before the actual charge and another one afterwords. the high pressure in common rail ensures that when it injected the fuel atomizes to a very high degree and mixes evenly with the air, thereby it making very clean exhaust gas. The engine pr. , timing of fuel injected is controlled ECU. The injectors have very precise dose of diesel into each cylinder .and ECU makes sure the fuel injected at optimum moment. "This ensures lower emissions, and allows better fuel economy.

Share this comment


Link to comment

Crdi is common rail direct fuel injection system , where there is  common rail which stores high pressurized fuel for injection into the engine cylinders.In conventional diesel engines or in most commonly used engines, the pressure of fuel has to be increased for each and every cycle but incase of crdi ,Once the pressure is generated it is stored in the common rail and is then injected through the fuel injector to cylinders of the engine. The pressure generated is about  1500bars.But why? There should be an increase in pressure?? the pressure has to be increased so that their is almost complete combustion of fuel during combustion and this also reduces harmful gases emitted during combustion in to the atmosphere. Due to these advantages they are used nowadays in almost all diesel engine cars of reputed companies.

 

 

CRDI means Common Rail Direct Injection.. In crdi contains a small tube is called Common rail where the injectors are connected and contains fuel at a constant high pressure of 1,350 bars. The CRDI engine small amount of fuel into the engine before the actual charge and another one afterwords. the high pressure in common rail ensures that when it injected the fuel atomizes to a very high degree and mixes evenly with the air, thereby it making very clean exhaust gas. The engine pr. , timing of fuel injected is controlled ECU. The injectors have very precise dose of diesel into each cylinder .and ECU makes sure the fuel injected at optimum moment. "This ensures lower emissions, and allows better fuel economy.

 

.

Share this comment


Link to comment

In short

Who writes, participated in the development of CRDI technology

It was born in Italy, dating back to the 80's

The two universities was Naples (Federico II ) and Lecce.

My degree thesis was, (combustion control in diesel cycle engines)

Some questions

Why the common rail system is born and the main benefits of the system

1) the cost of the injection pump was high in relation to the cost of the engine engine

2) make regular combustion in direct injection diesel

3) Avoid excess black smoke and polluting exhaust -Today a CRDI works with injections of 2050 bar and 7 injections

The engine was a dummy Fiat 1500 cc 4-cylinder direct injection.

We worked with initial pressures of 200 bar and two injections, a small pre-injection, and a main one.

... despite the unit displacement of 375 cc, the engine was running very well and adjusting

At this stage, the goal was to make the combustion adjust, without the pressure peak that created malfunctioning with this small displacement.

Splitting the injections, the cycle approached an OTTO cycle, much like a diesel with pre-chamber

The operating parameters require at least 18/20 sensors

Today a CRDI works with injections of 2050 bar and 7 injections in-run cycles at low speeds, this means silent and smooth engine

Share this comment


Link to comment

I have tried to find proof of the claims that direct injection is more efficient, but all I get are claims and phrases such as "direct injection is more efficient than indirect injection".

I would like to do a side-by-side comparison of the two technologies.

I would require two engines which are identical in every way, except the one is direct injected and the other one is indirect injected. The only such report I found was for the OM322 and OM352 truck engines, but those engines run at speeds below 2500RPM. I am not convinced that direct injection is better, as the components cost more, and there are more components, the systems are incredibly sensitive to maintenance and fuel quality, and the very high pressures require sturdier (which means heavier and more expensive) construction.

Share this comment


Link to comment

Hai i'm from indonesian.

Why in CRDI.. if we running out of gas . After we full in tank again.. the engine cant stabilize againt ?

And the problem always injector bushing pump and scanning over again ??

It is best combust.. i agree.. but it is not suit for villager user. And it pushing driver for always keep the tank not empty or out of gas while driving by.

Share this comment


Link to comment

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • br
  • br