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US 6,293,255 B1Granted
Fuel injection system
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsKimitake Otome, Junichi Kaku, Hidetoshi Kageyama
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AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorsKimitake Otome, Junichi Kaku, Hidetoshi Kageyama
Estimating the term…
The present invention is an injection system including an injection device. The injection device includes a pumping chamber and an electrically operated device associated with the pumping chamber which, when energized, is capable of providing a rapid increase in localized fluid pressure in said pumping chamber without reciprocating a piston in a cylinder bore. A discharge port associated with the pumping chamber permits discharging of fluid displaced by the localized pressure increase. The injection system includes a circuit providing an energizing voltage to the electrically operated device, and a control for changing at least one characteristic of the energizing voltage selected from the group consisting of: the peak energizing voltage, the rate at which said energizing voltage increases, the rate at which said energizing voltage decreases, the duration of energization, and the frequency of energization.
A fuel injection device for a fuel system of an engine for delivering fuel to a fuel injector valve of said engine, said injection device including an electrostrictive element driven fluid pumping device comprising a pumping chamber, a piezoelectric element disposed within said pumping chamber and forming the sole means within said pumping chamber for increasing the pressure therein, said pumping chamber having a continuously open outlet through which pressurized fluid is discharged to said fuel injector valve, said piezoelectric element being selectively energized by a voltage supplied by an electric circuit which is switchable between a powered condition and a discharged condition, wherein the total volume of fuel injected in a single injection cycle through said outlet is controlled by changing a peak voltage or the rate of increase or decrease in voltage applied to said piezoelectric element by said circuit.
Dependencies are inferred from the claim text.