Electronically Controlled High Pressure Unit Injector System for Diesel Engines 911819

To achieve the future emissions regulations with low particulate and Nox levels, both the engine combustion system and the fuel injection equipment will have to be improved. For the fuel injection equipment, high injection pressure and variable injection timing as a function of engine speed, load, and temperature are of great importance. BOSCH is developing two different solutions:
  • electronically controlled unit injector and single cylinder pump systems,
  • high-pressure inline pumps with control sleeve and electronic control.
This paper describes:
  • the unit injector and its high-pressure solenoid valve
  • the requirements for the mounting of the unit injector in the engine
  • the low-pressure system
  • the electronic control unit and the metering strategy


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