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US 9,068,540 B2Granted
Fuel injector
AssigneeRobert Bosch GmbH
InventorsHolger Rapp, Helmut Clauss, Wolfgang Stoecklein, Bernd Berghaenel, Marco Beier, Changyi Wang
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AssigneeRobert Bosch GmbH
InventorsHolger Rapp, Helmut Clauss, Wolfgang Stoecklein, Bernd Berghaenel, Marco Beier, Changyi Wang
Estimating the term…
The invention relates to a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine, comprising a nozzle needle (1) which is able to perform stroke motions and by the stroke motion of which at least one injection opening can be exposed or closed, and further comprising a control valve (2) for controlling the stroke motion of the nozzle needle (1) in that, depending on the respective switch position of the control valve (2), hydraulic pressure applied in closing direction to the nozzle needle (1) in a control chamber (3) is altered, and further comprising a sensor array (4) for detecting the needle closing time. According to the invention, the sensor array (4) is arranged in the low-pressure area of the fuel injector in a space (5) which is sealed with respect to the fuel-conducting area (6). Sealing of the space (5) is effected by a membrane (7) made of a fuel-resistant, electrically conductive material, allowing the membrane (7) to also be utilized for implementing a ground connection.
A fuel injector for injecting fuel into the combustion chamber of an internal combustion engine, the fuel injector having a nozzle needle (1), which is able to perform stroke motions and by the stroke motion of which at least one injection opening can be exposed or closed, and having a control valve (2) for controlling the stroke motion of the nozzle needle (1) in that, depending on the respective operating position of the control valve (2), a hydraulic pressure in a control chamber (3) acting upon the nozzle needle (1) in the closing direction is altered, and further having a sensor arrangement (4) for detecting the needle closing time, characterized in that the sensor arrangement (4) is arranged in a low-pressure region of the fuel injector in a space (5) which is sealed with respect to a fuel-carrying region (6), and the sealing of the space (5) is effected by a diaphragm (7) made of a fuel-resistant, electrically conductive material, allowing the diaphragm (7) to also be utilized for implementing a ground connection, wherein the diaphragm (7) is connected directly or indirectly to the sensor arrangement (4) and to a housing part of the fuel injector.
The fuel injector as claimed in 1, characterized in that the diaphragm (7) is elastic.
Dependencies are inferred from the claim text.