Patent ID: 6293255
Filing Date: 2001-09-25
Classification: F02B,F02D,F02M

Abstract:
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.