METHOD AND DEVICE FOR PROCESSING A SIGNAL PRODUCED BY A SENSOR FOR DETECTING THE ROTATION OF A ROTATING TARGET

摘要

The invention relates to a method for processing a main signal produced by a sensor for detecting the rotation of a rotating target having voltage levels. The main signal includes pulses having, for a rotation speed of the given target, a first positive voltage level when the target rotates in a first predetermined rotational direction or a second positive voltage level, different from said first voltage level, when the target rotates in a second rotational direction opposite said first rotational direction. A first secondary signal (COMP1) is generated in comparison with the main signal at a first predetermined voltage threshold (TH1), between the first voltage level and the second voltage level. A second secondary signal (COMP2) is generated in comparison with the main signal at a second predetermined voltage threshold (TH2), between the second voltage level and the zero voltage. A predetermined delay (τ) in the second signal is intentionally added in relation to the first secondary signal. Then the duration between an active front end of the second secondary signal and the last active front end of the first secondary signal preceding said active front end of the second secondary signal is compared with a predetermined time threshold so as to therefrom deduce the rotational direction of the target.