Patent ID: 9068540
Filing Date: 2015-06-30
Classification: F02M

Abstract:
1. 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.