Patent ID: 9644997
Date: 2017-05-09
CPC Classifications: G01D,G01M,G01R

Claim:
1. An automatic calibration method for a motor camshaft sensor of an engine of a vehicle, the engine having at least one camshaft ( 16 ), a toothed encoded target ( 14 ) associated with said camshaft, said method comprising: providing a magnetic field sensor ( providing an electronic circuit in communication with the magnetic field sensor; continuously measuring, via said electronic circuit, a value of the electrical signal generated by the magnetic field sensor corresponding to the amplitude of the magnetic field during a time corresponding to at least one revolution of the target; determining, by way of a computer apparatus in communication with the electronic circuit, a maximum amplitude A determining an auto-adaptive threshold K′ of the detection of the teeth and intervals of the target, to be applied to the signal received from the magnetic sensor, with allowance for geometrical and/or assembly imperfections of the target, according to formula: and automatically determining, at the computer apparatus, an out-of-roundness of the toothed wheel in order to determine a position of each cylinder with respect to a combustion cycle of the engine.