Method for correcting an angular position measurement in an internal combustion engine

A method for determining the angular position of an internal combustion engine, wherein a measurement of the angular position is made using a target comprising at its periphery uniformly spaced teeth with one singularity and which is associated with a sensor that detects the passage of a tooth front for each tooth, a passage past a tooth front theoretically corresponding in the engine to the passing of a predetermined piston through a top dead center position at the end of the compression stroke in a corresponding cylinder, said tooth front being referred to hereinafter as a combustion tooth front,

• the method comprising:
• detection of a first predetermined mode of operation of the engine (100);
• measurement of a first time elapsed between the passing past the sensor of a tooth front that passes before the combustion tooth front, and that is referred to as earlier tooth front, and of the combustion tooth front (200);
• measurement of a second time elapsed between the passing past the sensor of the combustion tooth front and of a tooth front that passes after the combustion tooth front and that is referred to as a later tooth front, the later tooth front being symmetrical with the earlier tooth front about the combustion tooth front (200);
• comparison of the first time with the second time, these two times being theoretically equal if the combustion tooth front passes past the sensor when the predetermined piston is passing through its top dead center position at the end of the compression stroke (300);
• the comparison between the first time and the second time corresponding to a difference (300), and the value of the difference being filtered in order to yield a filtered difference (400), and
• determination of a first corrective term for the angular position measurement measured by the sensor on the basis of the result of the comparison between the first time and the second time according to a predetermined formula corresponding to an engine type (500), the first corrective term corresponding to an affine function of the filtered difference,
• determination of the angular position of the engine by applying the determined first corrective term to the angular position measurement measured by the sensor.