Continental Automotive Gmbh

Continental Automotive France

Olivier Marle

Marie-Nathalie Larue

David Mirassou

Laure Carbonne

Yann Dinard

Disclosed is a camshaft or crankshaft sensor including a toothed target, a measuring cell adapted to supply a raw signal and a processor module having two modes of operation: 1) a measurement mode in which the processor module is adapted to supply an output port of the sensor a measurement signal representing the times of passage of the teeth of the target at the level of the measuring cell; and 2) a diagnostic mode in which the processor module is adapted to supply at the output port of the sensor a diagnostic signal different from the measurement signal and representing the amplitude of the raw signal. Also disclosed is a method and a module for diagnosing such a sensor.

Camshaft or crankshaft sensor for automotive vehicle and diagnostic method for such a sensor

An automatic calibration method for a motor vehicle camshaft sensor, the vehicle having at least one camshaft, a toothed encoded target (or magnetic encoder) associated with this camshaft, and a magnetic field sensor placed near the target to detect magnetic field variations caused by the passage of the teeth of the target near the sensor, the sensor delivering signals corrected by a predetermined detection threshold K, the method including: continuously measuring the value of the magnetic field during at least one revolution of the target, determining the maximum amplitude Aof the field measured during this revolution, determining the minimum amplitude Aof the field measured during this revolution, finding the ratio of the amplitudes and determining an auto-adaptive correction coefficient K' to be applied to the signal received from the magnetic sensor, with allowance for the geometrical imperfections of the target, according to the following formula: 

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Deyme, France

Olivier Marle