A nozzle assembly of a fuel injector comprises a nozzle with a body extending along a main axis, in which a needle 30 is axially moveable between a closed position in which a first end 34 of said needle rests on a valve seat to prevent fuel injection through one or more injection orifices of said nozzle and an open position in which said needle is lifted from said seat to allow injection, the needle extends along a needle axis A and comprises a shaft portion 32 which is tapered at the first end 34 and defines an annular seating face 44 cooperating with a seating face on the valve seat, the needle assembly further includes a detection circuit in which said needle forms a switch, the needle 30 is designed to include a local dissymmetry 59 in the region of the annular seating face 44, which is configured to cause, in use, an unbalance of forces resulting in a transversal force exerted by the fuel about the needle first end 34.
Fuel injector with closed loop detection
2018-09-12
Patent
Electronic Resource
English