Fuel injection valve driving device

A fuel injection valve driving device for driving a fuel injection valve with a solenoid, comprising:

• a first switching element which is disposed between a booster circuit boosting a battery power and one end of the solenoid;
• a second switching element which is disposed between a battery and one end of the solenoid;
• a third switching element which is disposed between an other end of the solenoid and a ground;
• a fourth switching element which is disposed between one end of the solenoid and a ground;
• and
• a control unit which is configured to control ON/OFF states of the first switching element, the second switching element, the third switching element, and the fourth switching element,
• wherein the control unit is configured
• to turn on the fourth switching element during a valve closing detection period of detecting closing of the fuel injection valve to clamp the one end of the solenoid to a reference potential of a ground and
• to detect the closing of the fuel injection valve based on a change in voltage of the other end of the solenoid,
• the valve closing detection period being a predetermined period before and after an estimated time at a moment when a valve body collides with a valve seat.