FUEL INJECTOR WITH AND WITHOUT PRESSURE AMPLIFICATION WITH A CONTROLLABLE NEEDLE SPEED AND METHOD FOR THE CONTROL THEREOF

摘要

A fuel injector in injection systems for internal combustion engines having a valve body containing a control chamber that can be pressure-relieved and can be acted on with fuel via an inlet throttle and can be pressure-relieved via an outlet throttle. A first actuator can actuate a closing element. The valve body is connected to a holding body that has a nozzle body connected to it, which encompasses an injection valve element. In order to relieve the pressure in the control chamber, an additional, second outlet throttle is provided, whose closing element can be actuated either by an additional actuator or as a function of the power supply to a double-switching actuator.