Importance

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Abstract

A fuel injector nozzle, particularly for internal combustion engines, comprises a nozzle holder, which contains a valve needle, which is biased by a spring toward a closed position against the pressure of the liquid that is to be injected. The fuel injector nozzle is provided with a needle lift sensor comprising a position detector, which is contained in the nozzle unit and responsive to the position of the valve needle and a movable shielding member, which cooperates with the position detector and is mounted on that end of the valve needle which is remote from the valve seat or on a spring seat secured to said end of the valve needle. In order to provide a fuel injector valve which has a simple and inexpensive structure and yet delivers reliable measurements and will resist the thermal and mechanical loads to which it is subjected during operation and to permit the use of inexpensive means for evaluating the signal delivered by the needle lift sensor, the latter comprises light transmitting means, which define a light path, the shielding member consists of an optical shutter that is movable across said light path, and two optical glass fiber lines for transmitting light to and from said light path are connected to opposite ends thereof.

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First Claim