A multi-ignition coil control system includes a spark plug including first and second center electrodes, and first and second ground electrodes spaced apart from the center electrodes by a predetermined distance, a first ignition coil including a primary coil, and a secondary coil in which a discharge current is generated by electromagnetic induction with the primary coil, and a second ignition coil including a primary coil, and a secondary coil in which a discharge current is generated by electromagnetic induction with the primary coil, wherein one end of the secondary coil of the first ignition coil and one end of the secondary coil of the second ignition coil are electrically connected to one of the center electrodes, and the other end of the secondary coil of the first ignition coil and the other end of the secondary coil of the second ignition coil are electrically connected to the other of the center electrodes.

A multi-ignition coil control system includes a spark plug including first and second center electrodes, and first and second ground electrodes spaced apart from the center electrodes by a predetermined distance, a first ignition coil including a primary coil, and a secondary coil in which a discharge current is generated by electromagnetic induction with the primary coil, and a second ignition coil including a primary coil, and a secondary coil in which a discharge current is generated by electromagnetic induction with the primary coil, wherein one end of the secondary coil of the first ignition coil and one end of the secondary coil of the second ignition coil are electrically connected to one of the center electrodes, and the other end of the secondary coil of the first ignition coil and the other end of the secondary coil of the second ignition coil are electrically connected to the other of the center electrodes.

In an ignition apparatus, a deterioration determination circuit performs a deterioration determination task of (i) monitoring an absolute increase in a temperature parameter during a predetermined deterioration detection period that has been started since an energization command signal being inputted to a control circuit, and (ii) performing a comparison between the absolute increase in the temperature parameter and a predetermined deterioration detection threshold to thereby determine whether a level of deterioration of a switching circuit is within an acceptable level.

An embodiment system includes an ignition coil including a primary coil and a secondary coil, a high voltage battery selectively electrically connected the primary coil, a low voltage battery selectively electrically connected to the primary coil, and an electric and electronic element provided between the high voltage battery, the low voltage battery, and the primary coil of the ignition coil to selectively supply electric power of the high voltage battery or the low voltage battery to the primary coil.

An embodiment system includes an ignition coil including a primary coil and a secondary coil, a high voltage battery selectively electrically connected the primary coil, a low voltage battery selectively electrically connected to the primary coil, and an electric and electronic element provided between the high voltage battery, the low voltage battery, and the primary coil of the ignition coil to selectively supply electric power of the high voltage battery or the low voltage battery to the primary coil.

An internal combustion engine ignition device includes an ignition coil, an ignition plug, a main ignition circuit, and an energy input circuit. A first switching element of the main ignition circuit performs energization and interruption of energization to a first coil part of a primary coil to generate an induced electromotive force using a DC voltage. A second switching element of the energy input circuit performs energization and interruption of energization to a second coil part of the primary coil to keep a discharge current in a secondary coil within an intended range directly using the DC voltage, after the induced electromotive force has been generated. A soft-off circuit of the energy input circuit slows a turn-off speed of the second switching element. The energy input circuit is configured to, when decreasing a signal voltage added to a gate of the second switching element, execute a first decreasing stage of decreasing the signal voltage until it reaches the vicinity of a gate-source threshold voltage and a second decreasing stage of gradually decreasing the signal voltage in the vicinity of the threshold voltage.

An ignition coil control system may include 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 pair of electrodes generating spark discharge by a discharge current generated in the first ignition coil and the second ignition coil; and an ignition controller that controls spark discharge of the pair of electrodes by adjusting an amount and a duration of the discharge current 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 single pulse signal having a constant voltage including different voltages transmitted from an engine control unit (ECU).

An ignition coil control system may include 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 pair of electrodes generating spark discharge by a discharge current generated in the first ignition coil and the second ignition coil; and an ignition controller that controls spark discharge of the pair of electrodes by adjusting an amount and a duration of the discharge current 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 single pulse signal having a constant voltage including different voltages transmitted from an engine control unit (ECU).

A method of controlling an ignitor for a spark-ignition engine includes receiving, by a controller, at least one of fuel quality data regarding a fuel for the spark-ignition engine or a characteristic regarding the ignitor for the spark-ignition engine. The method additionally includes controlling, by the controller, an ignition energy characteristic of the ignitor in response to the at least one of the fuel quality data regarding the fuel or the characteristic regarding the ignitor for the spark-ignition engine.

A method of controlling an ignitor for a spark-ignition engine includes receiving, by a controller, at least one of fuel quality data regarding a fuel for the spark-ignition engine or a characteristic regarding the ignitor for the spark-ignition engine. The method additionally includes controlling, by the controller, an ignition energy characteristic of the ignitor in response to the at least one of the fuel quality data regarding the fuel or the characteristic regarding the ignitor for the spark-ignition engine.