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A Perfect Example of Technological Advancement – Common Rail Diesel

Jun 24th 2015 at 5:55 AM

When we say that Japan is a technologically forward country, we don’t say it without reasons. There are obvious pointers which prove the point aptly. Japan was the first country to develop and launch the high pressure rail fuel system. Other countries also made their noteworthy contributions thereafter. Though their approach differed, the working system remained the same almost everywhere. The engine control unit (ECU) opens each unit independently while injecting fuel. The common rail system (CRS) is suitable for all types of road run vehicles be it the ones with sophisticated machines or the ones with less sophisticate ones. Locomotive and marine applications also use the Common Rail Deisel system extensively. Today engineers are designing the vehicles in such a way that the CRS functions properly.

The high pressure in this system initiates the injection smoothly. The modern systems are well equipped with technology and it takes of lower emissions of noise under very short heating up time. The fuel is reserved at high pressure.

We need to understand here that is why, the term “common rail” used in this context. A common fuel rail is used to accumulate the fuel at a high pressure and deliver to individual units as and when required. This facilitates multi tasking of the fuel injectors at high pressure. A hydraulic valve is used to inject or spray the fuel into the cylinders controlling the pressure at the same time.

The common rail system is a technological advancement of science. Benefits of common rail system (CRS) are outlined below:

  • It helps to lower the noise level emitted.
  • It facilitates lower gas emissions.
  • It delivers a strong and consistent performance.
  • It helps in maintaining high level of efficiency.
  • Increases the longevity of the engine.
  • Reliability of the machine is achieved.

Let’s discuss in brief about what a common rail system consists of:

  • High pressure pump
  • A reservoir of fuel
  • Injectors to inject the desired and required amounts of fuel
  • A control unit of fuel which aids in controlling the flow of diesel

As every system has pros and cons, the CRS also has its share of faults. Few are considered:

  • Repairing cost of the common rail system is very high. Fixing indulges heavy cost.
  • The engine requires good amount of lubrication to run smoothly. In case the lubrication level is not maintained properly, the system can develop errors.
  • High temperatures cause degradation of the machine thus lowering the efficiency of the fuel injection.
  • It causes rattling in the engine which is rather damaging.

The common rail system has rather been helpful in reducing the pollution levels of the environment. The noise pollution emitted by the vehicles is lowered thus reducing the level of noise pollution. Gone are the days of black smoke emissions out of the road run vehicles.

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