High pressure injection

from Wikipedia, the free encyclopedia

High Pressure Injection (HPI) is an electronically controlled injection procedure for trucks - diesel engines of the Swedish company Scania .

The process generates a maximum injection pressure of 2400 bar. As in the "pump-nozzle" or "pump-line-nozzle" system, the injection pressure is generated mechanically via the camshaft of the valve train. The special feature is that the nozzle needle of the injector is not closed by a high spring force, as in other systems. The basic principle can be derived from the Cummins "PT" (Pressure-Time) injection system.