Control apparatus for fuel injection valve and mehod thereof

A control apparatus for a fuel injection valve, the control apparatus comprising:

• a drive control unit that controls an opening and closing operation of the fuel injection valve by causing an excitation current to flow in a solenoid of the fuel injection valve;
• a current detection circuit that detects the excitation current flowing in the solenoid;
• and
• an electronic control unit configured to:
• (a) calculate an injection standby period that is a period from an energization start point of the solenoid to a point at which the fuel injection valve opens;
• (b) adjust an energization period of the solenoid in accordance with the injection standby period;
• (c) measure a reference fall detection period that is a period from the energization start point to a reference fall detection point, the reference fall detection point being a point at which the excitation current detected by the current detection circuit falls below a reference current value that is smaller than a peak current value, while the excitation current decreases after the excitation current reaches the peak current value;
• and
• (d) set the injection standby period to be longer as the reference fall detection period is longer,
• wherein the peak current value is a value that is set as a current value at which the fuel junction valve opens reliably.