Electromagnetically operated device for the rapid switch-over of electro-hydraulically actuated fuel injectors.

摘要

The electromagnetically operated pilot valve (182) of an electrohydraulically actuated fuel injector is used to close and temporarily open the outlet side of an orifice (38) to close and temporarily open a hydraulically operated injector valve, depending upon electric pulses of a predetermined duration applied to a solenoid (172). In order to improve the controllability of injection events, it is important that the pilot valve (182) switch-over movement takes place as soon as possible after the end of an electric pulse. The closing bias of the pilot valve (182) is provided by a spring (196). To reduce the release time of the pilot valve (182), a stop member (184) placed coaxially to the stem (180) of the pilot valve (182) and protruding beyond the pole face (148, 150) of the solenoid (172) is provided.