Magnetic speed sensor with increased resolution

A method for increasing a resolution of a magnetic-field sensor for an internal combustion engine of a motor vehicle, comprising:

• detecting, by the magnetic-field sensor, variations induced by a passage of teeth of a target in proximity to the sensor, the teeth comprising an alternating succession of the teeth and of recesses being associated with an element driven by the internal combustion engine, the detecting including generating a magnetic signal, then periodically delivering an electrical output synchronization signal in a synchronization voltage range, to an electronic control unit,
• wherein the electrical synchronization signal includes successive, spaced-apart crenels, one of the-rising or falling edges of which corresponds to a beginning or an end of the respective passage of a tooth of the target, which occurs at a respective angle of rotation of the element of the engine, wherein the synchronization voltage range is interposed between an upper voltage modulation range above and a lower voltage modulation range below the upper and lower voltage of the synchronization range, respectively, the electrical synchronization signal in each of the lower and upper modulation ranges being modulated so as to comprise additional crenels, which are supplementary to the crenels of the synchronization signal, corresponding to periodic clock crenels with a period dependent on engine speed, an angle of rotation being identified by one of the rising or falling edges of each additional crenel;
• and
• controlling, by the control unit, operation of the internal combustion engine based on the electrical synchronization signal.