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AssigneeDelphi International Operations Luxembourg S.A.R.L.
InventorsEric Lecluse, Richard Denis Jacques Alain Enters, Eric Charleux
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A fuel injector for a compression ignition internal combustion engine which comprises a fuel injection valve having an injection valve member which is moveable in use, under the influence of fuel pressure within an injection valve member control chamber acting upon it, between a closed position and an open position. The fuel injector further comprises a high pressure fuel supply passage to the injection valve member control chamber, and an actuator operable to open and close a discharge valve connected between the injection valve member control chamber and a fuel outlet passage to a low pressure reservoir or drain. A shut-off valve is provided in the high pressure fuel supply passage and the shut-off valve has a shut-off valve member which is moveable in use, under the influence of fuel pressure within a shut-off valve member control chamber acting upon it, between a closed position and an open position. The shut-off valve member control chamber is connectable to the low pressure reservoir or drain via the discharge valve, and a fuel transfer passage is provided between the injection valve member control chamber and the low pressure reservoir or drain.
A fuel injector for a compression ignition internal combustion engine comprising a fuel injection valve having an injection valve member moveable, in use, under the influence of fuel pressure within an injection valve member control chamber acting upon it, between a closed position and an open position, a high pressure fuel supply passage to the injection valve member control chamber, and an actuator operable to open and close a discharge valve connected between the injection valve member control chamber and a fuel outlet passage to a low pressure reservoir or drain, wherein a shut-off valve is provided in the high pressure fuel supply passage, the shut-off valve having a shut-off valve member moveable, in use, under the influence of fuel pressure within a shut-off valve member control chamber acting upon it, between a closed position and an open position, wherein the shut-off valve member control chamber is connectable to the low pressure reservoir or drain via the discharge valve, and wherein a fuel transfer passage is provided between the injection valve member control chamber and the low pressure reservoir or drain, characterized in that the shut-off valve controls a flow of fuel from the high pressure fuel supply passage to the injection valve control chamber, and the discharge valve controls a flow of fuel from the injection valve control chamber to the low pressure reservoir or drain.
A fuel injector for a compression ignition internal combustion engine comprising a fuel injection valve having an injection valve member moveable, in use, under the influence of fuel pressure within an injection valve member control chamber acting upon it, between a closed position and an open position, a high pressure fuel supply passage to the injection valve member control chamber, and an actuator operable to open and close a discharge valve connected between the injection valve member control chamber and a fuel outlet passage to a low pressure reservoir or drain, characterised in that a shut-off valve is provided in the high pressure fuel supply passage, the shut-off valve having a shut-off valve member moveable, in use, under the influence of fuel pressure within a shut-off valve member control chamber acting upon it, between a closed position and an open position, wherein the shut-off valve member control chamber is connectable to the low pressure reservoir or drain via the discharge valve, and wherein a fuel transfer passage is provided between the injection valve member control chamber and the low pressure reservoir or drain, wherein the shut-off valve comprises a shut-off valve body within which the shut-off valve member, which is in the form of a piston, is slideably moveable within a piston chamber, the valve body being fluidly connected at a first end to the shut-off valve member control chamber, and being fluidly connected to the high pressure fuel supply passage at a second end and at an intermediate fuel chamber between the two ends, and the valve body is provided with a valve seat between the intermediate chamber and the second end, and the piston is provided with a complementary valve face engageable with the valve seat to form a fluid tight closure within the high pressure fuel supply passage when the shut-off valve is closed.
Dependencies are inferred from the claim text.