Patent ID: 6622702
Filing Date: 2003-09-23
Classification: F02D,F02M

Abstract:
A common rail fuel injection device, comprising:common rails that store fuel, which has been discharged from a fuel supply pump, under accumulated pressure; pressure sensors, which detect fuel pressure in said common rails; injectors, having: a pressure control chamber, through which a portion of the fuel supplied from said common rails is guided; a needle valve that opens and closes nozzle holes for the injection of fuel into a combustion chamber by rising and falling based on the action of pressure of the fuel in said pressure control chamber; a open/close valve that opens and closes a discharge path, which discharges high pressure fuel in said pressure control chamber in order to control the fuel pressure in said pressure control chamber; and an actuator that actuates said open/close valve; detection means for detecting an engine running state; and a controller that controls actuation of said actuator in order to control fuel injection from said injectors in accordance with detection signals from said detection means; wherein said controller responds to the fact that a predetermined pressure, which is set at a value that is no more than the open-valve pressure for performing fuel injection from said injectors, is not reached by said fuel pressure in the common rails, as detected by said pressure sensors at startup of the engine, and causes the actuation of said actuator, so that extraction of air in said common rails from said pressure control chamber via said discharge path is thus effected.