Electronically-controlled fluid injector system having pre-injection pressurizable fluid storage chamber and direct-operated check

摘要

A unit fuel injector for receiving fuel at a low supply pressure and for injecting fuel into a combustion chamber of an engine during an injection sequence comprises an injector body having an injector orifice; means disposed in the body for pressurizing fuel to a selectable level independent of and substantially higher than the supply pressure; means disposed in the injector body to directly control the injection of pressurized fuel through the orifice into the combustion chamber at a selectable point in the injection sequence; and means disposed in the injector body to directly control the end of fuel injection at a selectable point in the injection sequence.