초록 ▼

A fuel injection valve with an electrical terminal signalling when the injection opens includes a second switch which is serially connected, electrically, with the needle valve so that the needle valve (15) can break an electrical circuit upon first lifting off the valve seat (16,17), full movement

A fuel injection valve with an electrical terminal signalling when the injection opens includes a second switch which is serially connected, electrically, with the needle valve so that the needle valve (15) can break an electrical circuit upon first lifting off the valve seat (16,17), full movement of the needle valve even upon engagement with the housing (10,11,12) still leaving an open circuit condition of an electrical terminal (49), although the needle valve body (15) re-engages the housing, by including a second switch (40,42; 51,52) serially with the switch formed by the valve cone and valve seat (17,16), the second switch including a movable second element (40,51) slidable with respect to a first fixed element (42,52) and moved by a push sleeve (28) or a push rod (70) with a dead or lost motion upon movement of the valve element (15) for a portion (h2) of its full stroke (h1) to then engage the movable second contact element and move it off the first contact element, and permit overtravel of the second contact element for the full stroke length (h1) of the needle element (15), so that the electrical circuit between the needle valve (15) and the external terminal (49) will remain open although the needle valve again contacts the metallic housing (10,11,12) of the valve-nozzle combination.

대표청구항 ▼

Fuel injection valve and nozzle combination, for use in an internal combustion engine having a valve body (10,11,12) of electrically conductive material; a needle valve element (15) of electrically conductive material formed with a valve cone (17) thereon; a valve seat (16) formed on the valve body;

Fuel injection valve and nozzle combination, for use in an internal combustion engine having a valve body (10,11,12) of electrically conductive material; a needle valve element (15) of electrically conductive material formed with a valve cone (17) thereon; a valve seat (16) formed on the valve body; a valve spring (25) engaging the needle valve element to press the valve cone against the valve seat, and to seal the valve against injection of fuel and to establish an electrical contact between the needle valve element (15) and the valve body (10,11,12) and, upon lifting of the valve element during an injection stroke, to permit injection of fuel and to break the electrical contact so that the valve seat and valve cone will form a first electrical switch, and comprising, in accordance with the invention a second electrical switch (40,42; 51,52) electrically serially connected with said first switch, the second electrical switch being controlled by the needle valve element to open upon movement of the needle valve element (15) from the valve seat by a predetermined distance (h2) corresponding to a portion of the injection stroke (h1) of the needle valve element, and remaining open so long as the valve cone (17) of the needle valve element is spaced from the valve seat (16) by said predetermined distance.