Patent ID: 9181893
Filing Date: 2015-11-10
Classification: F02D,F02M

Abstract:
1. An electronically controlled fuel injection valve comprising: a valve body having defined therein a first flow path along which fuel is fed through a fuel supply port, and having a control valve housing in an upper portion thereof; a nozzle part coupled to a lower portion of the valve body, and having defined therein a nozzle chamber which is filled with fuel that is supplied via the first flow path so that a needle disposed therein is pressed upward, whereby the needle is lifted up so that fuel is injected; a needle driving part disposed inside the valve body, the needle driving part driving the needle of the nozzle part; an upper pressure chamber formed above the needle driving part, the upper pressure chamber creating a pressure when the upper pressure chamber is filled with fuel fed through the fuel supply port, the pressure pressing the needle driving part in a downward direction; a lower pressure chamber positioned below the upper pressure chamber, the lower pressure chamber creating a pressure when the lower pressure chamber is filled up with fuel, the pressure pressing the needle driving part in an upward direction; a second flow path formed inside the valve body via the control valve housing, the second flow path being connected to the lower pressure chamber, such that fuel is supplied the lower pressure chamber; a control needle disposed in the control valve housing, the control needle opening and closing the second flow path in response to a control signal, thereby controlling a flow rate of fuel that is supplied to the lower pressure chamber; a control chamber formed in the valve body so as to be connected to the lower pressure chamber, such that the control chamber is filled with fuel from the lower pressure chamber when fuel is discharged; and a control orifice connected to the control chamber, and allows fuel inside the control chamber to be discharged out of the valve body.