|
(11) | EP 1 186 773 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
|
|
|
|
|||||||||||||||||||||||
| (54) | Fuel injector |
| (57) A fuel injector (1) comprising a housing (2) with a nozzle (4), a needle (3) movably
accommodated in a needle accommodating chamber (5) formed in the housing (2), for
opening or closing the nozzle (4), a pressure control chamber (8) defined between
the needle (3) and an inner wall of the needle accommodating chamber (5) and filled
with a fuel, a displacement of the needle depending on the fuel pressure in the pressure
control chamber (8), a pressure control valve (14) movably provided in the housing
for controlling the fuel pressure in the pressure control chamber (8); and an actuator
(15) for controlling a displacement of the pressure control valve (14). The needle
(3) is displaced to a position in which it closes the nozzle (4) when the pressure
control valve (14) is displaced to the zero-displaced position, is displaced to a
position in which it partly opens the nozzle when the pressure control valve (14)
is displaced to an intermediate position, and is displaced to a position in which
it fully opens the nozzle when the pressure control valve (14) is displaced to a fully-displaced
position. |