04-02-2021 дата публикации
Номер: US20210033428A1
Принадлежит:
A method for automatic calibration of a camshaft sensor for a motor vehicle. The sensor includes a processing module configured to generate, from a raw signal indicative of the variations in a magnetic field which are caused by the rotation of a toothed target and measured by a cell, an output signal indicative of the moments at which the teeth pass past the cell. The calibration method makes it possible, for each tooth, to determine a switching threshold not only as a function of a local minimum and of a local maximum for the tooth during the preceding revolution of the target, but also as a function of a corrective value calculated from a local maximum and/or a local minimum of the raw signal during the passage of a preceding tooth past the cell during a new revolution. 1. A method for automatic calibration of a camshaft sensor for a motor vehicle engine , [{'b': 1', '2', '3, 'a toothed target comprising at least two teeth (D, D, D),'}, 'a measurement cell configured to supply a raw signal indicative of variations in a magnetic field which are induced by a rotation (R) of the target, and', {'b': 1', '2', '3, 'a processing module configured to supply, from the raw signal, an output signal indicative of moments at which the teeth (D, D, D) of the target pass past the cell,'}], 'said sensor comprising{'sub': '1', 'claim-text': [{'sub': j,n', 'j, 'determining a local minimum (m) of the raw signal as a space preceding said tooth (D) passes past the cell,'}, {'sub': j,N', 'j, 'determining a local maximum (M) of the raw signal as said tooth (D) passes past the cell,'}, {'sub': j,N', 'j,N−1', 'j,N', 'j, 'calculating a switching threshold (S) for generating the output signal as a function of a local minimum (m) and of a local maximum (M) which are determined for said tooth (D) in a preceding revolution (N−1) of the target,'}], 'said method comprising, for each new revolution (N) of the target and for each tooth (D){'sub': j,N', 'k,N', 'k,N', 'k', 'k,N−1', 'k, 'wherein the ...
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