Electromagnetic Fuel Injector With Two Independent Coils and Related Control Method

1) An electromagnetic fuel injector (1) comprising:

• a tubular support body (4);
• an injection nozzle (3) arranged at an end of the support body (4);
• an injection valve (7) coupled to the injection nozzle (3);
• a plunger (8), which is movable, so as to adjust the fuel flow through the injection nozzle (3), between a closed position and an open position of the injection valve (7);
• an electromagnetic actuator (6) provided with a main electromagnet (11) configured, when it is activated, to apply a force to the plunger (8), which pushes the plunger (8) towards the open position of the injection valve (7) and provided with a secondary electromagnet (12) configured, when it is activated, to apply a force to the plunger (8), which pushes the plunger (8) towards the closed position of the injection valve (7);
• a closing spring (10) configured to push the plunger (8) towards the closed position of the injection valve (7);
• and
• a control unit (20) configured, so as to open the injection valve (7), to activate the main electromagnet (11) so that the main electromagnet (11) generates a magnetic force moving the plunger (8) towards the open position, overcoming the elastic force of the closing spring (10);
• wherein the control unit (20) is configured to activate, during the opening of the injection valve (7) and when the plunger (8) is close to the open position, also the secondary electromagnet (12) so that the secondary electromagnet (12) generates a magnetic force slowing down the movement of the plunger (8) towards the open position.