Method for limiting a suction of oil into an internal combustion engine

A method for limiting a suction of oil into an internal combustion engine comprising a plurality of cylinders in each of which a piston slides, following the detection of the presence of said suction of oil, characterized in that it comprises the following steps:

• a step (100) of confirming the presence of suction, performed in the absence of fuel combustion, with the following sub-steps:
• a) monitoring by measuring durations of time intervals (T_Seg_Mes_n) between two successive passes through top dead center at the end of compression by the pistons in the cylinders,
• b) applying a deceleration correction factor (Rn) to be applied to the measured interval duration, for each time interval, in order to take into account a mean deceleration of the engine speed,
• c) comparing the measured and corrected interval durations (T_Corr_Seg_Mes_n), and
• d) potentially detecting one (or more) measured and corrected interval duration(s) less than the other measured and correct interval durations, and storing the result of the detection,
• a step (200) of determining a quantity of oil burned in the engine if in the preceding confirmation step (100) at least one measured and corrected interval duration (T_Corr_Seg_Mes_n) less than the others has been detected, with the following sub-steps:
• e) determining a gradient (GR) representing a variation in speed of rotation of the engine, and
• f) on the basis of said gradient, estimating the quantity of oil burned (Q) using a predetermined, stored map,
• if applicable, a step (300) of adapting the intake air pressure in the cylinders, during which a variation in said pressure is commanded as a function of the previously determined quantity of oil burned.