Fuel injection valve

A fuel injection valve for a fuel injection system of an engine comprising:

• a valve body movably accommodated in a nozzle body for opening or closing an injection port;
• a pressure control chamber for applying control-chamber pressure to the valve body in a valve-body closing direction;
• a fixed plate having a high pressure passage for supplying high pressure fuel to the pressure control chamber so as to move the valve body in the valve-body closing direction, the fixed plate having a low pressure passage for discharging fuel out of the pressure control chamber so as to move the valve body in a valve-body opening direction;
• a sub out-orifice formed in the low pressure passage for restricting flow rate of the fuel discharged from the pressure control chamber;
• an in-orifice formed in the high pressure passage for restricting flow rate of the fuel supplied into the pressure control chamber;
• a movable plate movably accommodated in the pressure control chamber, the movable plate being brought into contact with the fixed plate so as to block off communication between the high pressure passage and the pressure control chamber or the movable plate being separated from the fixed plate so as to communicate the high pressure passage to the pressure control chamber, and the movable plate having a through-hole for communicating the pressure control chamber to the low pressure passage;
• and
• a control valve for opening or closing an outlet port of the low pressure passage;
• an electric actuator for opening the control valve when electric power is supplied to the electric actuator,
• wherein the fuel injection system has an electronic control unit for controlling power supply to the electric actuator in order to carry out multiple fuel injections in one combustion cycle of the engine, and the electronic control unit comprises the following steps;
• a first step for calculating target values for the multiple fuel injections from the injection port based on an engine operational condition;
• a second step for calculating a power-supply starting time based on the target values for each fuel injection;
• a third step for calculating a power-supply ending time based on the target values of each fuel injection;
• a fourth step for determining whether an injection interval of the fuel injections is smaller than a predetermined threshold value;
• a fifth step for correcting the power-supply starting time when the injection interval is smaller than the predetermined threshold value, so that the power-supply starting time is advanced by a predetermined time;
• and
• a sixth step for carrying out the power-supply to the electric actuator in accordance with the above calculated power-supply starting time or the above corrected power-supply starting time and the power-supply ending time.