Patent ID: 9200606
Filing Date: 2015-12-01
Classification: 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, the valve body having a control valve housing in an upper portion thereof; a nozzle part coupled to a lower portion of the valve body, the nozzle part 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 toward a nozzle hole; an injection controller disposed inside the valve body so as to be able to open and close the first flow path in order to control the nozzle part to inject fuel; a nozzle pressing part positioned below the injection controller, the nozzle pressing part applying a downward force to the needle of the nozzle part; an upper pressure chamber formed above the injection controller, the upper pressure chamber creating a pressure when the upper pressure chamber is filled with fuel injected through the fuel supply port, the pressure moving the injection controller downward; 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 lifting up the injection controller; a cutoff pressure chamber positioned below the lower pressure chamber, the cutoff pressure chamber creating a pressure when the cutoff pressure chamber is filled with fuel that flows through the first flow path, the pressure lifting up the injection controller; a second flow path formed in the valve body via the control valve housing, the second flow path being connected to the lower pressure chamber, thereby allowing fuel to be supplied to the lower pressure chamber; a control needle disposed within 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 the control orifice allowing fuel inside the control chamber to be discharged out of the valve body.