| 摘要 |
PROBLEM TO BE SOLVED: To provide an ignition device equipped with an ion current detector capable of minimizing a loss of ignition energy, even when an ion detecting power supply voltage is increased. SOLUTION: The ignition device is equipped with a drive power on a primary side, and a spark plug and an ion current detector on a secondary side. The ignition device minimizes the loss of ignition energy even when the detecting power supply voltage is increased, with a configuration in which a capacitor as a power source of the ion current detector is provided with a switching element for shunting the capacitor, and the switching element has a control unit for keeping an on-state at least during the first half of a discharge duration at the spark plug. COPYRIGHT: (C)2007,JPO&INPIT
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