Restriction structure for reducing gas formation in a high pressure fuel return line
AssigneeSiemens Automotive Corporation
InventorMartin Maass
Life of this patent
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Abstract
A fuel delivery system 10 includes a fuel rail 22 to supply fuel to at least one fuel injector 26, a high pressure fuel pump 20 to provide fuel to the fuel rail 22, a fuel regulator 28 to regulate fuel pressure at the fuel rail 22, and flow restriction structure 30, 32 disposed in a fuel return line 34 between the fuel regulator 28 and the high pressure fuel pump 20. The flow restriction structure 30, 32 is constructed and arranged to substantially prevent bubbles from reaching the high pressure fuel pump 20 when the high pressure fuel pump is providing fuel in a certain flow range to the fuel rail 22. The flow restriction structure defines at least one flow restricting orifice.
Claims21
A fuel delivery system comprising:
- at least one fuel injector;
- a high pressure fuel pump to provide fuel to the at least one fuel injector;
- a fuel regulator to regulate fuel pressure at said fuel injector, and
- a flow restriction structure in a closed fuel line between the fuel regulator and a feed to the high pressure fuel pump constructed and arranged to substantially prevent bubbles from reaching the high pressure fuel pump when the high pressure fuel pump is providing fuel in a certain flow range to said fuel injector.
A fuel delivery system comprising:
- a fuel rail to supply fuel to at least one fuel injector;
- a high pressure fuel pump to provide fuel to the fuel rail;
- a fuel regulator to regulate fuel pressure at said fuel rail;
- and
- a fuel restriction structure in a closed fuel line between the fuel regulator and a feed to the high pressure fuel pump constructed and arranged to substantially prevent bubbles from reaching the high pressure fuel pump when the high pressure fuel pump is providing fuel in a certain flow range to said fuel rail.
A method of preventing bubbles from occurring in a fuel delivery system including a fuel rail to supply fuel to at least one fuel injector, a high pressure fuel pump to provide fuel to the fuel rail, a fuel regulator to regulate fuel pressure at said fuel rail, and a closed fuel return line fluidly connecting the fuel regulator with a feed to the high pressure pump, the method comprising:
- providing a flow restriction structure in the return line between the fuel regulator and the high pressure fuel pump to substantially prevent bubbles in the return line from reaching the high pressure fuel pump when the high pressure fuel pump is providing fuel to the fuel rail in a certain flow range.
Dependencies are inferred from the claim text.