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DIESEL ELECTRONIC MANAGEMENT

This article examines the different fuel supply systems of modern diesel engines (TDi, Common Rail), as well as the electronic management that controls them.

 

Management Electronic Diesel is used today both engines “indirect injection” as in the famous engines “direct injection”.

 

Within the direct injection engines, three different systems must be distinguished when injecting the fuel into the cylinders.

  • By rotary injection pump.
  • Common Rail.
  • Injector-pump.

 

  1. Systemuses traditional diesel technology “indirect injection” based on a rotary pump (e.g. pump “VE type” BOSCH) that dispenses and distributes the fuel to each engine cylinder engines.This pump adapts to the electronic management by replacing the mechanical parts that control the “fuel dosage” as well as the “variation of advance to the injection” by electronic elements that will allow a more precise control of the pump that results in higher engine power with lower fuel consumption. This system is used by the TDI engines of the Volkswagen Group and the Opel and Renault DTIs, as well as the FORD TDdi.

 

  1. SystemCommon Rail (common-rail) which is very different from that used in the previous system, diesel pump delivers very high pressure to a common rail or accumulator which is connected all the injectors.At the right moment an electronic control unit will give the order for the injectors to open by supplying fuel to the cylinders. This technology is very similar to that used in petrol injection engines with the difference that the pressure in the common duct or accumulator is much higher in diesel engines (1300 bars) than in gasoline engines (6 bars maximum).
    This system is used by the engines, new generation DCI of Renault, the HDI of the PSA Group and the JTD of the Fiat Group,

 

 

  1. Asystemof pump-injector in which the pump and injector integrated into the same body that is abler each very high injection pressures (2000 bars), bringing greater efficiency and engine performance is achieved. There is one pump-injector per cylinder. This system is used by the Volkswagen group in its second-generation TDI engines.