| 摘要 |
PROBLEM TO BE SOLVED: To prevent a reverse flow of an electric charged in a capacitor, secure bias voltage required for detecting an ionic current, and perform excellent and stable detection of the ionic current. SOLUTION: A combustion state detector for an internal combustion engine generates bias voltage by charging a capacitor 13 with a primary voltage generated in a primary coil 2a of an ignition coil 2 of the internal combustion engine, applies the bias voltage on spark plugs 14a, 14b arranged in a combustion chamber, and detects an electric current passing from the capacitor 13 to the spark plugs 14a, 14b by an ion generated in the combustion chamber at the time of burning of the internal combustion engine as an ion current. In this combustion state detector for the internal combustion engine, a rectifying element 17 rectifying an electric current passing from the primary coil 2a to the capacitor 13 has a recovery time, from sending the electric current from the primary coil 2a to the capacitor 13 till preventing an electric current passing in the reverse direction, which is not more than 2μS.
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