Patent ID: 6684853
Filing Date: 2004-02-03
Classification: F02M

Abstract:
A fuel injector having a fuel pressure intensifier for increasing the pressure of a volume of fuel to a selected relatively high level, the fuel being admitted to the fuel injector at a pressure that is less than the pressure required to cause opening of an injector needle valve, the fuel intensifier being in fluid communication with the needle valve, the needle valve being openable for injection of fuel into a combustion chamber during an injection event, comprising:an injection pressure control valve for preparing fuel pressure being fluidly coupled to the fuel pressure intensifier for controlling an injection event by porting a non-fuel actuating fluid to the fuel pressure intensifier; and a fuel injection timing controller having a single control valve for controlling the timing of delivery of fuel to a combustion chamber during the injection event, the fuel injection pressure control valve being independently controllable for maintaining fuel at the selected relatively high level of pressure to the needle valve during the injection event to effect fuel injection and the fuel injection timing control valve for selectively interrupting fuel injection from the needle valve if desired during the injection event by controlling a flow of intensifier pressurized fuel to the needle valve by selectively porting fuel to a controller chamber in fluid communication with the needle valve, the controller chamber having a continuously open drain orifice.