Ignition coil control system

An ignition coil control system, comprising:

• a first ignition coil including a primary coil and a secondary coil;
• a first switch that selectively electrically connects the primary coil of the first ignition coil;
• a second ignition coil including a primary coil and a secondary coil;
• a second switch that selectively electrically connects the primary coil of the second ignition coil;
• a spark plug including a center electrode and a ground electrode which generate spark discharge by discharge currents generated in the first ignition coil and the second ignition coil, or discharge current generated in one of the first ignition coil and the second ignition coil;
• and
• a controller connected to the first switch and the second switch,
• wherein the controller is configured to control the spark discharge generated between the center electrode and the ground electrode by adjusting an amount and a duration of the discharge currents of the first ignition coil and the second ignition coil by turning the first switch and the second switch on or off according to a pulse signal of the controller, and
• wherein the controller is configured to selectively execute a multi-stage ignition through the first ignition coil and the second ignition coil and a single-stage ignition through the one of the first ignition coil and the second ignition coil according to an operation region of an engine,
• wherein the operation region of the engine includes:
• a first region, in which an exhaust gas recirculation (EGR) gas is used in the engine or a lean combustion is performed;
• and
• a second region excluding the first region,
• wherein the controller is configured to execute the multi-stage ignition in the first region, and configured to execute the single-stage ignition in the second region,
• wherein the ignition coil control system further includes a DC-DC converter connected to the primary coil of the first ignition coil, the primary coil of the second ignition coil and a battery,
• wherein the controller is configured to increase a current magnitude supplied to the primary coil of the first ignition coil and the primary coil of the second ignition coil through the DC-DC converter as an engine speed and an engine load are increased in the first region, and
• wherein the controller is configured to increase the current magnitude supplied to the primary coil of the first ignition coil and the primary coil of the second ignition coil through the DC-DC converter by increasing a voltage applied to the primary coil of the first ignition coil and the primary coil of the second ignition coil step by step as the engine speed and the engine load are increased in the first region.