METHOD FOR CARRYING OUT AN IONIC CURRENT MEASUREMENT IN A COMBUSTION ENGINE USING A LEAN FUEL MIXTURE

摘要

A method for carrying out an ionic current measurement in an internal combustion engine using a lean fuel mixture which requires an increased burning duration, in which method a combustion start/a failed combustion start is detected, after which the ignition spark is cut off and the ionic current measurement can be done. The combustion start can be detected by means of a measurement of the change of the burning potential and/or the burning current, detected at the low tension side of the secondary coil of the ignition system by means of leak capacitances of the ignition coil or by means of a separate winding of the ignition coil. The ignition spark is cut off by means of a controllable ignition magneto.