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US 2003/0141389 A1Published application
Injection device and method for injecting fluid
OwnerFriedrich Boeckinginventor
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OwnerFriedrich Boeckinginventor
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The invention relates to an injection system, having a control valve (2), an actuating element for actuating the control valve (2), an injection nozzle which is controllable by the control valve (2) via a pressure buildup or pressure reduction in a control chamber (8), wherein the control valve (2) has at least two switching states, and in a first switching state of the control valve (2), a first pressure is established in the control chamber (8), at which pressure the injection nozzle is closed, and in a second switching state of the control valve (2), a second pressure is established in the control chamber (8), at which the injection nozzle is opened, wherein the control valve (2) has at least one third switching state, in which a third pressure is established in the control chamber (8), which pressure is between the first pressure and the second pressure and at which the injection nozzle is opened. The invention also relates to a method for injecting fluid in which the injection system of the invention is used.
An injection system, having a control valve (2), an actuating element for actuating the control valve (2), an injection nozzle which is controllable by the control valve (2) via a pressure buildup or pressure reduction in a control chamber (8), wherein the control valve (2) has at least two switching states, and in a first switching state of the control valve (2), a first pressure is established in the control chamber (8), at which pressure the injection nozzle is closed, and in a second switching state of the control valve (2), a second pressure is established in the control chamber (8), at which the injection nozzle is opened, characterized in that the control valve (2) has at least one third switching state, in which a third pressure is established in the control chamber (8), which pressure is between the first pressure and the second pressure and at which the injection nozzle is opened.
The injection system of one of the foregoing claims, characterized in that the control chamber (8) is defined partly by one end face of a pressure rod (10) of the injection nozzle.
The injection system of one of the foregoing claims, characterized in that the control valve (2) in the first switching state is located in a first valve seat (4), so that the control chamber (8) is disconnected from a leak fuel system (14);
The injection system of one of the foregoing claims, characterized in that the control valve (2) in a fourth switching state is located in a second valve seat (6), so that the control chamber (8) is disconnected from a leak fuel system (8).
The injection system of one of the foregoing claims, characterized in that the injection pressure is generated by a common rail (16).
A method for injecting fluid, in which an actuating element is triggered electrically, the actuating element actuates a control valve (2), and by the actuation of the control valve (2), a pressure in a control chamber (8) is built up or reduced, and the injection nozzle opens or closes as a function of the pressure in the control chamber (8), characterized in that as a result of the triggering of the actuating element, the control valve (2) is first moved from a first switching state into a second switching state of at least three switching states, as a result of which the pressure in the control chamber (8) is reduced and the injection nozzle opens;
Dependencies are inferred from the claim text.