CONTROL APPARATUS FOR FUEL INJECTION VALVE AND MEHOD THEREOF

摘要

An electronic control unit that calculates an injection standby period, which is a period from an energization start point of the solenoid to a point at which the fuel injection valve opens, and adjusts an energization period of the solenoid in accordance with the calculated injection standby period. The electronic control unit of the control apparatus for a fuel injection valve then measures a reference fall detection period, which is a period from the energization start point to a reference fall detection point, and sets the injection standby period to be longer as the reference fall detection period is longer. Here, the reference fall detection point is a point at which the excitation current detected by the current detection circuit falls below a reference current value, which is smaller than a peak current value, while the excitation current decreases after reaching the peak current value.

主权项

1. 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.