An internal combustion engine - combustion unconditionally - detection device is provided with an ignition device (200), which leads to the fact that a spark plug (100) a fuel ignites; a ignition control (301), the operation of the ignition device (200) controls; an ion current - detecting means (40), a produced ion current is detected; an ion current - detection range - adjusting means (306), which has an ion current - detection range is established; and a preferably a direction (307), which a preignition within a region is sensed; a leakage current - detection range - adjusting means (304), which is a leakage current - detection range is established; and a leakage current - determining means (305), which determines whether or not an annealing, there is, on the basis of a current that, within a detection area to be set by the ion current - detecting means (40) is detected. The ignition control (301) includes a not combustion cycle - ignition control (302); the leakage current - area of coverage which, by means of the leakage current - detection range - adjusting means (304) is set, is not adjusted within the combustion cycle. Consequently, it is possible to detect both a heater as well as a preferably be carried out reliably and detection.
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