Method for controlling a high-pressure fuel injector

A method for controlling a high-pressure fuel injector for an internal combustion engine of a motor vehicle, the injector being provided with a solenoid for actuating a needle which opens the injector and with a spring for returning said needle to the closed position, the solenoid of the fuel injector being supplied with current by a control means comprising a first potential connected to the drain of a first transistor, the source of the first transistor being connected to the anode of a first diode, the cathode of the first diode being connected to the cathode of a second diode, to a first connector of the solenoid of the injector, and to the source of a second power transistor, the drain of the second transistor being connected to a second potential, the anode of the second diode being connected to ground, the second potential being connected to ground via a capacitance, to the cathode of a third diode, and to the drain of the second transistor, the anode of the third diode being connected to a second connector of the solenoid of the injector and to the drain of a third transistor, the source of the third transistor being connected to ground via a resistor,

• wherein the control method comprises:
• determining whether the second potential is lower than the potential threshold allowing a current for opening the needle of the injector to be generated,
• if the second potential is lower than the potential threshold, determining whether an injection is not required,
• if an injection is not required, charging the solenoid of the injector by controlling the first transistor and the third transistor so as to be on while controlling the second transistor so as to be off, and then, after detecting an inductance charging current greater than a reference current through the resistor, controlling the transistors so as to be in a second state in which the first transistor is controlled so as to be on while controlling the second transistor and the third transistor so as to be off,
• waiting a predetermined time to allow the solenoid to discharge,
• determining whether the second potential is lower than the potential threshold allowing a current for opening the needle of the injector to be generated,
• if the second potential is lower than the potential threshold, returning to charging the solenoid of the injector.