Combustion flame and inner wall contacting distance determining method for internal combustion engine, involves determining distance between flame and wall by specific relationship comprising parameters such as limit voltage and current

摘要

The method involves carrying out negative polarization of a central measurement electrode (3) having a measurement surface aligned with an inner wall (9) of a combustion chamber such that the electrode attracts positive ions of a combustion flame (10) and ionization current is appeared in the electrode. Limit voltage and limit current of a limit point are determined. A distance (d) between the flame and the wall is determined by a specific relationship comprising parameters such as limit voltage, limit current, preset coefficient that is a function of pressure in the chamber and the surface.