Hartridge Ltd Blog

Industry News: Delphi Direct Acting Diesel Common Rail System

Posted by Anne Ruff on January 14, 2009

The Delphi Direct Acting Diesel Common Rail System is an advanced fuel injection system that uses innovative injection technology. Instead of being moved by an electro-hydraulic circuit, the injector needle is moved by apiezo ceramic actuator. In this manner, the injector can spray the fuel into the combustion chamber much faster and with greatly improved accuracy and spray atomisation when compared to the existing fuel injection technologies. This means that NOx (nitrogen oxide) emissions are reduced by approximately 30% with approximatly 10% more torq and power.

Added to this the Delphi Direct Acting Diesel Common Rail System has a high pressure, modular pump (0.6 to 1.2 cm3/rev) with integrated inlet metering valve, an electronic control unit and a tubulor common rail with high pressure valve of up to 2000 bar.

The system has a number of benefits such as:

  • An improved injection fuel atomisation and speed which helps to reduce engine noise and emissions.
  • Multiple injection capability.
  • Delivering small, accurate and stable quantities of fuel throughout the vehicles lifespan leading to consistently low emissions.
  • A flexibility choice of afterteatment devices.
  • Delphi's high pressure modular diesel fuel pump and direct acting common rail enable operation up to 2000 bar.
  • The ECU provides direct control of the needle lift in the nozzle and hence the rate of injection into the combustion chamber.
  • Delphi's Direct Acting Diesel Common Rail System also features Individual Injector Characterization (I3C), an exclusive Delphi technology that enables the ECU to be calibrated with the injection system to contribute to accurate fuel delivery.

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