FIELD: pumps.
SUBSTANCE: methods and systems for operation of a high-pressure injection pump are proposed to provide high constant pressure of fuel in a fuel rail of distributed injection and high variable pressure of fuel in a direct injection fuel stage. Pressure in the fuel rail of the distributed injection can be increased to a level higher than the pressure created by the fuel feed pump, due to configuration of fuel system containing various check valves, pressure relief valves and bypass valve installed between inlet of high-pressure injection pump and fuel stage of distributed injection.
EFFECT: to ensure fuel supply at high pressure with limited supply of fuel through direct injection of high pressure, advantages of distributed high-pressure injection can be used.
23 cl, 6 dwg
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