Importance

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Abstract

This fuel injector comprises: a main body portion including an inflow port into which fuel supplied from a fuel supply source flows, a flow passage through which the fuel that has flowed in from the inflow port flows, and a discharge port which is connected to the flow passage and which discharges the fuel; a valve unit at least a portion of which is formed using a magnetic body, which is disposed so as to be capable of moving in a straight-line direction between a position closing the discharge port and a position opening the discharge port, which is urged in the direction opening the discharge port by means of the pressure of the fuel flowing in from the inflow port, and to which an elastic force is imparted by an elastic member in the direction closing the discharge port; a solenoid device which includes a coil, which generates an electromagnetic force by causing a drive current to flow through the coil, and which drives the valve unit in the direction opening the discharge port, by means of the electromagnetic force; and a control portion which variably sets the value of a prescribed time period that includes a drive current supply start time point, of the drive current flowing through the coil, in accordance with a supply pressure of the fuel supplied to the inflow port.

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First Claim