Controlling Apparatus of Variable Capacity Type Fuel Pump and Fuel Supply System
AssigneeHitachi, Ltd.
InventorsKenichiro TOKUO, Satoshi Usui, Hiroyuki Yamada
Life of this patent
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Abstract
A controlling apparatus of a variable capacity type fuel pump, for avoiding noises caused due to drive of the fuel pump and noises caused due to drive of injectors from overlapping or duplicating with each other in the timing thereof, wherein signals for driving the pump reduced, or the timing thereof is shifted forward/backward, within a specific timing where the o overlapping can be prospected, or a specific timing where they are determined to overlap or duplicate with each other.
Claims10
A high pressure fuel supply for supplying high pressure fuel to a fuel injection valve of an internal combustion engine, comprising:
- a suction port located at an entrance of a pressurizing chamber;
- a rod magnetically driven by conducting current through an electro-magnetic coil;
- a suction valve for opening/closing a valve seat, the suction valve being located at the pressurizing chamber side of said suction port;
- and
- a spring for biasing said suction valve into an opening or closing direction,
- wherein said rod is arranged to maintain said suction valve in an opening or a closing condition while said electromagnetic coil is conducted and to maintain said suction valve in an opposite direction of said opening or said closing condition after stopping conducting current through said electromagnetic coil,
- said rod or said suction valve is configured such that an operation stroke thereof is restricted by a control member provided at an end of the operation stroke, and
- said suction valve is arranged to be maintained into an opening condition at a fuel injection valve closing timing.
A high pressure fuel supply pump for supplying high pressure fuel to a fuel injection valve of an internal combustion engine, comprising:
- a suction port located at an entrance of a pressurizing chamber;
- a rod magnetically driven, by conducting current through an electromagnetic coil;
- a suction valve for opening/closing a valve seat, the suction valve being located at the pressurizing chamber side of said suction port;
- and
- a spring for biasing said suction valve into an opening or closing direction,
- wherein said rod is arranged to maintain said suction valve in an opening or a closing condition while said electromagnetic coil is conducted and to maintain said suction valve in an opposite direction of said opening or said closing condition after stopping conducting current through said electromagnetic coil,
- said rod or said suction valve is configured such that an operation stroke thereof is restricted by a control member provided at an end of the operation stroke, and
- said suction valve is arranged to be maintained in an opening condition when a fuel injection valve closing timing overlap a suction valve closing timing.
A high pressure fuel supply pump for supplying high pressure fuel to a fuel injection valve of an internal combustion engine, comprising:
- a suction port located at an entrance of a pressurizing chamber;
- a rod magnetically driven by conducting current through an electromagnetic coil;
- a suction check valve for opening/closing a valve seat, the suction check being located at the pressurizing chamber side of said suction port;
- a fuel passage separated from said suction port, for connecting said pressurizing chamber to the upper of said suction valve;
- and
- an electromagnetic valve for selectively communicating or blocking said fuel passage and configured such that an operation stroke thereof is restricted by a control member provided at an end of the operation stroke, wherein
- said fuel passage is caused to be maintained in a communicating condition at a fuel injection valve closing timing.
Dependencies are inferred from the claim text.