Electronically controlled fuel injection pump
AssigneeDiesel Kiki Co., Ltd.
InventorsMasayoshi Kobayashi, Takeo Kimura
Life of this patent
Estimating the term…
Abstract
A plunger is reciprocable in a barrel to force fuel to the injection nozzles. The portion of the barrel defining with the plunger the compression chamber is movable and is formed with a port leading to the unpressurized fuel reservoir in such a manner that the plunger uncovers the port at the end of its fuel injection stroke to overflow fuel from the compression chamber to the reservoir and terminate fuel injection. The position of the movable portion of the barrel and thereby the port relative to the plunger determines the fuel injection volume. A closed loop electronic servo system is provided to position the movable part of the barrel in accordance with the required fuel injection volume.
Claims9
A fuel injection pump comprising:
- an enclosure;
- a pump element comprising a plunger rotatingly and reciprocally movable in the enclosure to define a compression chamber of variable volume, the pump element connecting the compression chamber to a fuel inlet during an intake stroke of the pump element and connecting the compression chamber to a fuel outlet during a compression stroke of the pump element;
- a movable overflow member for connecting the compression chamber to a fuel reservoir during the compression stroke of the pump element, the position of the pump element at which the overflow member connects the compression chamber to the fuel reservoir being variable in dependence on the position of the overflow member to determine the fuel injection volume, said movable overflow element being in direct sliding engagement with said plunger and including a bore in which said plunger is received;
- an electrical actuator having a linearly movable actuator element connected to move the overflow member, said electrical actuator member comprising a solenoid and said linearly movable actuator member comprising a coil of said solenoid;
- and
- a closed loop electrical servo control means for electrically controlling the electrical actuator to linearly move the actuator element to move the overflow member to a position corresponding to the required fuel injection volume.
Dependencies are inferred from the claim text.