Fuel injection pumping apparatus
AssigneeC.A.V. Limited
InventorsBoaz A. Jarrett, Paul Lakra
Life of this patent
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Abstract
A fuel injection pumping apparatus comprises a displacement piston which is located within the cylinder, an outlet from one end of the cylinder and a fluid pressure operable member mounted within a further cylinder for actuating the piston and causing fuel to be delivered through the outlet. Means is operable upon movement of the displacement piston to a predetermined position to terminate delivery of fuel through the outlet and valve means is provided to control the application of fluid under pressure to the fluid pressure operable member.
Claims10
A fuel injection pumping apparatus comprising in combination, a displacement piston located within a cylinder, an outlet and a fuel inlet at one end of the cylinder, a one-way valve in said fuel inlet for permitting fuel to flow only into said inlet, a fluid pressure operable member mounted within a further cylinder for actuating said piston and causing fuel to be delivered through said outlet, means operable upon movement of the piston to a predetermined position in said cylinder during delivery of fuel through said outlet by the piston, to terminate flow of fuel through said outlet, valve means operable to place an end of said further cylinder in communication with a source of fluid under pressure to effect movement of the displacement piston in a direction to deliver fuel through said outlet, or with a drain to permit return motion of the piston, the apparatus including means controlling the operation of said valve means, a control circuit operable to control the means controlling operation of said valve means, and sensing coil means positioned to sense the position of the fluid pressure operable member mounted within said further cylinder to provide a signal to the control circuit indicative of the position of the displacement piston, the extent of the return motion of the displacement piston being controlled to determine the quantity of fuel discharged through said outlet during movement of the piston by said fluid pressure operable member.
A fuel injection pumping apparatus comprising in combination, a displacement piston located within a cylinder, an outlet from one end of said cylinder, a fluid pressure operable member mounted within a further cylinder for actuating said piston and causing fuel to be delivered through said outlet, means operable upon movement of the piston to a predetermined position in said cylinder during delivery of fuel through said outlet by the piston, to terminate flow of fuel through the outlet, valve means operable to place an end of said further cylinder in communication with a source of fluid under pressure to effect movement of the displacement piston in a direction to deliver fuel through said outlet, or with a drain to permit return motion of the piston, a source of fuel under pressure, a non return valve through which said source of fuel is in communication with said one end of the cylinder, and in which said valve means comprises first and second spring loaded valve elements, said first valve element being spring loaded to the open position to place said end of the further cylinder in communication with the drain and said second valve element being spring loaded to the closed position, said second valve element when in the open position placing said one end of the further cylinder in communication with said source of fluid.
Dependencies are inferred from the claim text.