Fuel pump
AssigneeHitachi, Ltd.
InventorsTakashi Yoshizawa, Donald J. McCune, Harsha Badarinarayan, Akira Inoue
Life of this patent
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Abstract
A high pressure fuel pump for use with a direct injection engine having a housing which defines a pump chamber. A port is formed in the housing which fluidly connects a fuel in the passageway with the pump chamber. An elongated valve is movably mounted within the housing between an open and a closed position. In its open position, the inlet passageway is fluidly connected with the pump chamber while, conversely, in the closed position the fuel valve blocks the fluid flow between the inlet passageway and the pump chamber. A circuit controls the deceleration of the valve to reduce pump noise.
Claims17
A fuel pump comprising:
- a housing defining a pump chamber,
- a port formed in said housing which fluidly connects a fuel inlet passageway to said pump chamber,
- an elongated valve axially slidably mounted in said housing and having a valve head, said valve movable between an open position in which said valve head is spaced from said port thus allowing fluid flow through said port, and a closed position in which said valve head contacts said housing around said port and prevents fluid flow through said port,
- a solenoid which controls the movement of said valve,
- an electrical control circuit electrically connected to said solenoid which generates an output signal to decelerate said valve as said valve moves from said open to said closed position.
A fuel pump comprising:
- a housing defining a pump chamber,
- a port formed in said housing which fluidly connects a fuel inlet passageway to said pump chamber,
- an elongated valve axially slidably mounted in said housing and having a valve head, said valve movable between an open position in which said valve head is spaced from said port thus allowing fluid flow through said port, and a closed position in which said valve head contacts said housing around said port and prevents fluid flow through said port,
- said housing having a magneto-rheological fluid (MRF) chamber surrounding at least a portion of said valve,
- an MRF coil contained in said housing around said MRF chamber,
- an MRF electrical control circuit electrically connected to said MRF coil which generates an output signal to decelerate said valve as said valve moves from said open to said closed position.
A fuel pump comprising:
- a housing defining a pump chamber, a fuel inlet passageway and a valve chamber fluidly connected in series between said fuel inlet passageway and said pump chamber,
- a valve having a valve head, said valve head being movably mounted in said valve chamber and movable between an open position in which said fuel inlet passageway is fluidly connected through said valve chamber to said pump chamber and a closed position in which said valve head blocks said fuel inlet passageway and prevents fluid flow from said fuel inlet passageway to said pump chamber,
- an actuator which, under control of a control circuit, moves said valve head between said open and said closed position,
- an electrical control circuit electrically connected to said solenoid which generates an output signal to decelerate said valve as said valve moves from said open to said closed position.
Dependencies are inferred from the claim text.