Fuel delivery system
AssigneeHitachi, Ltd.
InventorsDonald J. McCune, Harsha Badarinarayan, Pilar Hernandez Mesa, George Saikalis
Life of this patent
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Abstract
A fuel delivery system for a direct injection internal combustion engine having two fuel rails and a plurality of fuel injectors attached to and fluidly connected with each fuel rail. A first fuel pump has its output connected with the first fuel rail while a second fuel pump has its output connected with the second fuel rail. A crossover pipe fluidly connects the outlets of both the first and second pumps. Both the first pump and the second pump each have an intake stroke and a pumping stroke. Furthermore, the intake stroke of the first pump coincides with the pumping stroke of the second pump and vice versa.
Claims18
A fuel delivery system comprising:
- a first and second fuel rails, each fuel rail having a fuel passageway,
- a plurality of fuel injectors, at least two of said fuel injectors fluidly connected to the fuel passageway of each fuel rail,
- a first fuel pump having a first pumping cycle, said first fuel pump having an inlet connected to a fuel source and an outlet fluidly connected to said fuel passageway of said first fuel rail,
- a second fuel pump having a second pumping cycle, said second fuel pump having an inlet connected to a fuel source and an outlet fluidly connected to said fuel passageway of said second fuel rail,
- a crossover pipe fluidly connecting the outlets of said first and second fuel pumps,
- wherein each of said first and second pumping cycles has an intake stroke and a pumping stroke, and
- wherein said intake stroke of said first pump coincides with the pumping stroke of said second pump and the pumping stroke of said first pump coincides with the intake stroke of said second pump.
A fuel delivery system comprising:
- an elongated rail having a fuel passageway,
- a plurality of fuel injectors fluidly connected to the fuel passageway of said fuel rail,
- a fuel pump having an inlet connected to a fuel source and an outlet fluidly connected to said fuel passageway of said fuel rail,
- a plurality of fluid reservoirs associated with said fuel rail, each fluid reservoir having a cross-sectional area greater than said fuel passageway,
- wherein one fluid reservoir is associated with each fuel injector.
A fuel injector for an internal combustion engine comprising:
- an elongated body having an inlet end, an outlet end and a fluid passageway interconnecting said inlet end and said outlet end,
- a valve seat disposed across the outlet end of said body, said valve seat having a first and second set of through orifices,
- a first valve movably mounted in said body between a closed position in which said first valve engages said valve seat and closes said first set of orifices, and an open position in which said first valve separates from said valve seat and opens said first set of orifices,
- a second valve movably mounted in said body between a closed position in which said second valve engages said valve seat and closes said second set of orifices, and an open position in which said second valve separates from said valve seat and opens said second set of orifices,
- a valve actuator for selectively moving said first and second valves between their respective open and closed positions.
Dependencies are inferred from the claim text.